summaryrefslogtreecommitdiff
path: root/app/models/merge_request.rb
blob: 26e3c8f38f60a3d1c3678a18cb5bfab9134477fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
# frozen_string_literal: true

class MergeRequest < ApplicationRecord
  include AtomicInternalId
  include IidRoutes
  include Issuable
  include Noteable
  include Referable
  include Presentable
  include TimeTrackable
  include ManualInverseAssociation
  include EachBatch
  include ThrottledTouch
  include Gitlab::Utils::StrongMemoize
  include LabelEventable
  include ReactiveCaching
  include FromUnion
  include DeprecatedAssignee
  include ShaAttribute
  include IgnorableColumns
  include MilestoneEventable

  sha_attribute :squash_commit_sha

  self.reactive_cache_key = ->(model) { [model.project.id, model.iid] }
  self.reactive_cache_refresh_interval = 10.minutes
  self.reactive_cache_lifetime = 10.minutes
  self.reactive_cache_hard_limit = 20.megabytes

  SORTING_PREFERENCE_FIELD = :merge_requests_sort

  belongs_to :target_project, class_name: "Project"
  belongs_to :source_project, class_name: "Project"
  belongs_to :merge_user, class_name: "User"

  has_internal_id :iid, scope: :target_project, track_if: -> { !importing? }, init: ->(s) { s&.target_project&.merge_requests&.maximum(:iid) }

  has_many :merge_request_diffs
  has_many :merge_request_context_commits
  has_many :merge_request_context_commit_diff_files, through: :merge_request_context_commits, source: :diff_files

  has_one :merge_request_diff,
    -> { order('merge_request_diffs.id DESC') }, inverse_of: :merge_request

  belongs_to :latest_merge_request_diff, class_name: 'MergeRequestDiff'
  manual_inverse_association :latest_merge_request_diff, :merge_request

  # This is the same as latest_merge_request_diff unless:
  # 1. There are arguments - in which case we might be trying to force-reload.
  # 2. This association is already loaded.
  # 3. The latest diff does not exist.
  # 4. It doesn't have any merge_request_diffs - it returns an empty MergeRequestDiff
  #
  # The second one in particular is important - MergeRequestDiff#merge_request
  # is the inverse of MergeRequest#merge_request_diff, which means it may not be
  # the latest diff, because we could have loaded any diff from this particular
  # MR. If we haven't already loaded a diff, then it's fine to load the latest.
  def merge_request_diff
    fallback = latest_merge_request_diff unless association(:merge_request_diff).loaded?

    fallback || super || MergeRequestDiff.new(merge_request_id: id)
  end

  belongs_to :head_pipeline, foreign_key: "head_pipeline_id", class_name: "Ci::Pipeline"

  has_many :events, as: :target, dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent

  has_many :merge_requests_closing_issues,
    class_name: 'MergeRequestsClosingIssues',
    dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent

  has_many :cached_closes_issues, through: :merge_requests_closing_issues, source: :issue
  has_many :pipelines_for_merge_request, foreign_key: 'merge_request_id', class_name: 'Ci::Pipeline'
  has_many :suggestions, through: :notes
  has_many :unresolved_notes, -> { unresolved }, as: :noteable, class_name: 'Note'

  has_many :merge_request_assignees
  has_many :assignees, class_name: "User", through: :merge_request_assignees
  has_many :user_mentions, class_name: "MergeRequestUserMention", dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent

  has_many :deployment_merge_requests

  # These are deployments created after the merge request has been merged, and
  # the merge request was tracked explicitly (instead of implicitly using a CI
  # build).
  has_many :deployments,
    through: :deployment_merge_requests

  KNOWN_MERGE_PARAMS = [
    :auto_merge_strategy,
    :should_remove_source_branch,
    :force_remove_source_branch,
    :commit_message,
    :squash_commit_message,
    :sha
  ].freeze
  serialize :merge_params, Hash # rubocop:disable Cop/ActiveRecordSerialize

  after_create :ensure_merge_request_diff
  after_update :clear_memoized_shas
  after_update :reload_diff_if_branch_changed
  after_save :ensure_metrics, unless: :importing?
  after_commit :expire_etag_cache, unless: :importing?

  # When this attribute is true some MR validation is ignored
  # It allows us to close or modify broken merge requests
  attr_accessor :allow_broken

  # Temporary fields to store compare vars
  # when creating new merge request
  attr_accessor :can_be_created, :compare_commits, :diff_options, :compare

  # Keep states definition to be evaluated before the state_machine block to avoid spec failures.
  # If this gets evaluated after, the `merged` and `locked` states which are overrided can be nil.
  def self.available_state_names
    super + [:merged, :locked]
  end

  state_machine :state_id, initial: :opened, initialize: false do
    event :close do
      transition [:opened] => :closed
    end

    event :mark_as_merged do
      transition [:opened, :locked] => :merged
    end

    event :reopen do
      transition closed: :opened
    end

    event :lock_mr do
      transition [:opened] => :locked
    end

    event :unlock_mr do
      transition locked: :opened
    end

    before_transition any => :opened do |merge_request|
      merge_request.merge_jid = nil
    end

    after_transition any => :opened do |merge_request|
      merge_request.run_after_commit do
        UpdateHeadPipelineForMergeRequestWorker.perform_async(merge_request.id)
      end
    end

    state :opened, value: MergeRequest.available_states[:opened]
    state :closed, value: MergeRequest.available_states[:closed]
    state :merged, value: MergeRequest.available_states[:merged]
    state :locked, value: MergeRequest.available_states[:locked]
  end

  # Alias to state machine .with_state_id method
  # This needs to be defined after the state machine block to avoid errors
  class << self
    alias_method :with_state, :with_state_id
    alias_method :with_states, :with_state_ids
  end

  state_machine :merge_status, initial: :unchecked do
    event :mark_as_unchecked do
      transition [:can_be_merged, :checking, :unchecked] => :unchecked
      transition [:cannot_be_merged, :cannot_be_merged_recheck] => :cannot_be_merged_recheck
    end

    event :mark_as_checking do
      transition [:unchecked, :cannot_be_merged_recheck] => :checking
    end

    event :mark_as_mergeable do
      transition [:unchecked, :cannot_be_merged_recheck, :checking] => :can_be_merged
    end

    event :mark_as_unmergeable do
      transition [:unchecked, :cannot_be_merged_recheck, :checking] => :cannot_be_merged
    end

    state :unchecked
    state :cannot_be_merged_recheck
    state :checking
    state :can_be_merged
    state :cannot_be_merged

    around_transition do |merge_request, transition, block|
      Gitlab::Timeless.timeless(merge_request, &block)
    end

    # rubocop: disable CodeReuse/ServiceClass
    after_transition unchecked: :cannot_be_merged do |merge_request, transition|
      if merge_request.notify_conflict?
        NotificationService.new.merge_request_unmergeable(merge_request)
        TodoService.new.merge_request_became_unmergeable(merge_request)
      end
    end
    # rubocop: enable CodeReuse/ServiceClass

    def check_state?(merge_status)
      [:unchecked, :cannot_be_merged_recheck, :checking].include?(merge_status.to_sym)
    end
  end

  validates :source_project, presence: true, unless: [:allow_broken, :importing?, :closed_without_fork?]
  validates :source_branch, presence: true
  validates :target_project, presence: true
  validates :target_branch, presence: true
  validates :merge_user, presence: true, if: :auto_merge_enabled?, unless: :importing?
  validate :validate_branches, unless: [:allow_broken, :importing?, :closed_without_fork?]
  validate :validate_fork, unless: :closed_without_fork?
  validate :validate_target_project, on: :create

  scope :by_source_or_target_branch, ->(branch_name) do
    where("source_branch = :branch OR target_branch = :branch", branch: branch_name)
  end
  scope :by_milestone, ->(milestone) { where(milestone_id: milestone) }
  scope :of_projects, ->(ids) { where(target_project_id: ids) }
  scope :from_project, ->(project) { where(source_project_id: project.id) }
  scope :from_and_to_forks, ->(project) do
    where('source_project_id <> target_project_id AND (source_project_id = ? OR target_project_id = ?)', project.id, project.id)
  end
  scope :merged, -> { with_state(:merged) }
  scope :closed_and_merged, -> { with_states(:closed, :merged) }
  scope :open_and_closed, -> { with_states(:opened, :closed) }
  scope :from_source_branches, ->(branches) { where(source_branch: branches) }
  scope :by_commit_sha, ->(sha) do
    where('EXISTS (?)', MergeRequestDiff.select(1).where('merge_requests.latest_merge_request_diff_id = merge_request_diffs.id').by_commit_sha(sha)).reorder(nil)
  end
  scope :by_merge_commit_sha, -> (sha) do
    where(merge_commit_sha: sha)
  end
  scope :by_cherry_pick_sha, -> (sha) do
    joins(:notes).where(notes: { commit_id: sha })
  end
  scope :join_project, -> { joins(:target_project) }
  scope :references_project, -> { references(:target_project) }

  PROJECT_ROUTE_AND_NAMESPACE_ROUTE = [
    target_project: [:route, { namespace: :route }],
    source_project: [:route, { namespace: :route }]
  ].freeze

  scope :with_api_entity_associations, -> {
    preload(:assignees, :author, :unresolved_notes, :labels, :milestone,
            :timelogs, :latest_merge_request_diff,
            *PROJECT_ROUTE_AND_NAMESPACE_ROUTE,
            metrics: [:latest_closed_by, :merged_by])
  }
  scope :by_target_branch_wildcard, ->(wildcard_branch_name) do
    where("target_branch LIKE ?", ApplicationRecord.sanitize_sql_like(wildcard_branch_name).tr('*', '%'))
  end
  scope :by_target_branch, ->(branch_name) { where(target_branch: branch_name) }
  scope :preload_source_project, -> { preload(:source_project) }

  scope :with_auto_merge_enabled, -> do
    with_state(:opened).where(auto_merge_enabled: true)
  end

  ignore_column :state, remove_with: '12.7', remove_after: '2019-12-22'

  after_save :keep_around_commit, unless: :importing?

  alias_attribute :project, :target_project
  alias_attribute :project_id, :target_project_id

  # Currently, `merge_when_pipeline_succeeds` column is used as a flag
  # to check if _any_ auto merge strategy is activated on the merge request.
  # Today, we have multiple strategies and MWPS is one of them.
  # we'd eventually rename the column for avoiding confusions, but in the mean time
  # please use `auto_merge_enabled` alias instead of `merge_when_pipeline_succeeds`.
  alias_attribute :auto_merge_enabled, :merge_when_pipeline_succeeds
  alias_method :issuing_parent, :target_project

  delegate :active?, to: :head_pipeline, prefix: true, allow_nil: true
  delegate :success?, :active?, to: :actual_head_pipeline, prefix: true, allow_nil: true

  RebaseLockTimeout = Class.new(StandardError)

  def self.reference_prefix
    '!'
  end

  # Returns the top 100 target branches
  #
  # The returned value is a Array containing branch names
  # sort by updated_at of merge request:
  #
  #     ['master', 'develop', 'production']
  #
  # limit - The maximum number of target branch to return.
  def self.recent_target_branches(limit: 100)
    group(:target_branch)
      .select(:target_branch)
      .reorder(arel_table[:updated_at].maximum.desc)
      .limit(limit)
      .pluck(:target_branch)
  end

  def rebase_in_progress?
    rebase_jid.present? && Gitlab::SidekiqStatus.running?(rebase_jid)
  end

  # Use this method whenever you need to make sure the head_pipeline is synced with the
  # branch head commit, for example checking if a merge request can be merged.
  # For more information check: https://gitlab.com/gitlab-org/gitlab-foss/issues/40004
  def actual_head_pipeline
    head_pipeline&.matches_sha_or_source_sha?(diff_head_sha) ? head_pipeline : nil
  end

  def merge_pipeline
    return unless merged?

    target_project.pipeline_for(target_branch, merge_commit_sha)
  end

  # Pattern used to extract `!123` merge request references from text
  #
  # This pattern supports cross-project references.
  def self.reference_pattern
    @reference_pattern ||= %r{
      (#{Project.reference_pattern})?
      #{Regexp.escape(reference_prefix)}(?<merge_request>\d+)
    }x
  end

  def self.link_reference_pattern
    @link_reference_pattern ||= super("merge_requests", /(?<merge_request>\d+)/)
  end

  def self.reference_valid?(reference)
    reference.to_i > 0 && reference.to_i <= Gitlab::Database::MAX_INT_VALUE
  end

  def self.project_foreign_key
    'target_project_id'
  end

  # Returns all the merge requests from an ActiveRecord:Relation.
  #
  # This method uses a UNION as it usually operates on the result of
  # ProjectsFinder#execute. PostgreSQL in particular doesn't always like queries
  # using multiple sub-queries especially when combined with an OR statement.
  # UNIONs on the other hand perform much better in these cases.
  #
  # relation - An ActiveRecord::Relation that returns a list of Projects.
  #
  # Returns an ActiveRecord::Relation.
  def self.in_projects(relation)
    # unscoping unnecessary conditions that'll be applied
    # when executing `where("merge_requests.id IN (#{union.to_sql})")`
    source = unscoped.where(source_project_id: relation)
    target = unscoped.where(target_project_id: relation)

    from_union([source, target])
  end

  # This is used after project import, to reset the IDs to the correct
  # values. It is not intended to be called without having already scoped the
  # relation.
  def self.set_latest_merge_request_diff_ids!
    update = '
      latest_merge_request_diff_id = (
        SELECT MAX(id)
        FROM merge_request_diffs
        WHERE merge_requests.id = merge_request_diffs.merge_request_id
      )'.squish

    self.each_batch do |batch|
      batch.update_all(update)
    end
  end

  WIP_REGEX = /\A*(\[WIP\]\s*|WIP:\s*|WIP\s+)+\s*/i.freeze

  def self.work_in_progress?(title)
    !!(title =~ WIP_REGEX)
  end

  def self.wipless_title(title)
    title.sub(WIP_REGEX, "")
  end

  def self.wip_title(title)
    work_in_progress?(title) ? title : "WIP: #{title}"
  end

  def committers
    @committers ||= commits.committers
  end

  # Verifies if title has changed not taking into account WIP prefix
  # for merge requests.
  def wipless_title_changed(old_title)
    self.class.wipless_title(old_title) != self.wipless_title
  end

  def hook_attrs
    Gitlab::HookData::MergeRequestBuilder.new(self).build
  end

  # `from` argument can be a Namespace or Project.
  def to_reference(from = nil, full: false)
    reference = "#{self.class.reference_prefix}#{iid}"

    "#{project.to_reference_base(from, full: full)}#{reference}"
  end

  def context_commits
    @context_commits ||= merge_request_context_commits.map(&:to_commit)
  end

  def commits(limit: nil)
    return merge_request_diff.commits(limit: limit) if merge_request_diff.persisted?

    commits_arr = if compare_commits
                    reversed_commits = compare_commits.reverse
                    limit ? reversed_commits.take(limit) : reversed_commits
                  else
                    []
                  end

    CommitCollection.new(source_project, commits_arr, source_branch)
  end

  def recent_commits
    commits(limit: MergeRequestDiff::COMMITS_SAFE_SIZE)
  end

  def commits_count
    if merge_request_diff.persisted?
      merge_request_diff.commits_count
    elsif compare_commits
      compare_commits.size
    else
      0
    end
  end

  def commit_shas(limit: nil)
    return merge_request_diff.commit_shas(limit: limit) if merge_request_diff.persisted?

    shas =
      if compare_commits
        compare_commits.to_a.reverse.map(&:sha)
      else
        Array(diff_head_sha)
      end

    limit ? shas.take(limit) : shas
  end

  def supports_suggestion?
    true
  end

  # Calls `MergeWorker` to proceed with the merge process and
  # updates `merge_jid` with the MergeWorker#jid.
  # This helps tracking enqueued and ongoing merge jobs.
  def merge_async(user_id, params)
    jid = MergeWorker.perform_async(id, user_id, params.to_h)
    update_column(:merge_jid, jid)

    # merge_ongoing? depends on merge_jid
    # expire etag cache since the attribute is changed without triggering callbacks
    expire_etag_cache
  end

  # Set off a rebase asynchronously, atomically updating the `rebase_jid` of
  # the MR so that the status of the operation can be tracked.
  def rebase_async(user_id, skip_ci: false)
    with_rebase_lock do
      raise ActiveRecord::StaleObjectError if !open? || rebase_in_progress?

      # Although there is a race between setting rebase_jid here and clearing it
      # in the RebaseWorker, it can't do any harm since we check both that the
      # attribute is set *and* that the sidekiq job is still running. So a JID
      # for a completed RebaseWorker is equivalent to a nil JID.
      jid = Sidekiq::Worker.skipping_transaction_check do
        RebaseWorker.perform_async(id, user_id, skip_ci)
      end

      update_column(:rebase_jid, jid)
    end

    # rebase_in_progress? depends on rebase_jid
    # expire etag cache since the attribute is changed without triggering callbacks
    expire_etag_cache
  end

  def merge_participants
    participants = [author]

    if auto_merge_enabled? && !participants.include?(merge_user)
      participants << merge_user
    end

    participants
  end

  def first_commit
    compare_commits.present? ? compare_commits.first : merge_request_diff.first_commit
  end

  def raw_diffs(*args)
    compare.present? ? compare.raw_diffs(*args) : merge_request_diff.raw_diffs(*args)
  end

  def diffs(diff_options = {})
    if compare
      # When saving MR diffs, `expanded` is implicitly added (because we need
      # to save the entire contents to the DB), so add that here for
      # consistency.
      compare.diffs(diff_options.merge(expanded: true))
    else
      merge_request_diff.diffs(diff_options)
    end
  end

  def non_latest_diffs
    merge_request_diffs.where.not(id: merge_request_diff.id)
  end

  # Overwritten in EE
  def note_positions_for_paths(paths, _user = nil)
    positions = notes.new_diff_notes.joins(:note_diff_file)
      .where('note_diff_files.old_path IN (?) OR note_diff_files.new_path IN (?)', paths, paths)
      .positions

    Gitlab::Diff::PositionCollection.new(positions, diff_head_sha)
  end

  def preloads_discussion_diff_highlighting?
    true
  end

  def discussions_diffs
    strong_memoize(:discussions_diffs) do
      note_diff_files = NoteDiffFile
        .joins(:diff_note)
        .merge(notes.or(commit_notes))
        .includes(diff_note: :project)

      Gitlab::DiscussionsDiff::FileCollection.new(note_diff_files.to_a)
    end
  end

  def diff_size
    # Calling `merge_request_diff.diffs.real_size` will also perform
    # highlighting, which we don't need here.
    merge_request_diff&.real_size || diffs.real_size
  end

  def modified_paths(past_merge_request_diff: nil)
    diffs = if past_merge_request_diff
              past_merge_request_diff
            elsif compare
              compare
            else
              self.merge_request_diff
            end

    diffs.modified_paths
  end

  def diff_base_commit
    if merge_request_diff.persisted?
      merge_request_diff.base_commit
    else
      branch_merge_base_commit
    end
  end

  def diff_start_commit
    if merge_request_diff.persisted?
      merge_request_diff.start_commit
    else
      target_branch_head
    end
  end

  def diff_head_commit
    if merge_request_diff.persisted?
      merge_request_diff.head_commit
    else
      source_branch_head
    end
  end

  def diff_start_sha
    if merge_request_diff.persisted?
      merge_request_diff.start_commit_sha
    else
      target_branch_head.try(:sha)
    end
  end

  def diff_base_sha
    if merge_request_diff.persisted?
      merge_request_diff.base_commit_sha
    else
      branch_merge_base_commit.try(:sha)
    end
  end

  def diff_head_sha
    if merge_request_diff.persisted?
      merge_request_diff.head_commit_sha
    else
      source_branch_head.try(:sha)
    end
  end

  # When importing a pull request from GitHub, the old and new branches may no
  # longer actually exist by those names, but we need to recreate the merge
  # request diff with the right source and target shas.
  # We use these attributes to force these to the intended values.
  attr_writer :target_branch_sha, :source_branch_sha

  def source_branch_ref
    return @source_branch_sha if @source_branch_sha
    return unless source_branch

    Gitlab::Git::BRANCH_REF_PREFIX + source_branch
  end

  def target_branch_ref
    return @target_branch_sha if @target_branch_sha
    return unless target_branch

    Gitlab::Git::BRANCH_REF_PREFIX + target_branch
  end

  def source_branch_head
    strong_memoize(:source_branch_head) do
      if source_project && source_branch_ref
        source_project.repository.commit(source_branch_ref)
      end
    end
  end

  def target_branch_head
    strong_memoize(:target_branch_head) do
      target_project.repository.commit(target_branch_ref)
    end
  end

  def branch_merge_base_commit
    start_sha = target_branch_sha
    head_sha  = source_branch_sha

    if start_sha && head_sha
      target_project.merge_base_commit(start_sha, head_sha)
    end
  end

  def target_branch_sha
    @target_branch_sha || target_branch_head.try(:sha)
  end

  def source_branch_sha
    @source_branch_sha || source_branch_head.try(:sha)
  end

  def diff_refs
    if importing? || persisted?
      merge_request_diff.diff_refs
    else
      repository_diff_refs
    end
  end

  # Instead trying to fetch the
  # persisted diff_refs, this method goes
  # straight to the repository to get the
  # most recent data possible.
  def repository_diff_refs
    Gitlab::Diff::DiffRefs.new(
      base_sha:  branch_merge_base_sha,
      start_sha: target_branch_sha,
      head_sha:  source_branch_sha
    )
  end

  def branch_merge_base_sha
    branch_merge_base_commit.try(:sha)
  end

  def validate_branches
    return unless target_project && source_project

    if target_project == source_project && target_branch == source_branch
      errors.add :branch_conflict, "You can't use same project/branch for source and target"
      return
    end

    [:source_branch, :target_branch].each { |attr| validate_branch_name(attr) }

    if opened?
      similar_mrs = target_project
        .merge_requests
        .where(source_branch: source_branch, target_branch: target_branch)
        .where(source_project_id: source_project&.id)
        .opened

      similar_mrs = similar_mrs.where.not(id: id) if persisted?

      conflict = similar_mrs.first

      if conflict.present?
        errors.add(
          :validate_branches,
          "Another open merge request already exists for this source branch: #{conflict.to_reference}"
        )
      end
    end
  end

  def validate_branch_name(attr)
    return unless will_save_change_to_attribute?(attr)

    branch = read_attribute(attr)

    return unless branch

    errors.add(attr) unless Gitlab::GitRefValidator.validate_merge_request_branch(branch)
  end

  def validate_target_project
    return true if target_project.merge_requests_enabled?

    errors.add :base, 'Target project has disabled merge requests'
  end

  def validate_fork
    return true unless target_project && source_project
    return true if target_project == source_project
    return true unless source_project_missing?

    errors.add :validate_fork,
               'Source project is not a fork of the target project'
  end

  def merge_ongoing?
    # While the MergeRequest is locked, it should present itself as 'merge ongoing'.
    # The unlocking process is handled by StuckMergeJobsWorker scheduled in Cron.
    return true if locked?

    !!merge_jid && !merged? && Gitlab::SidekiqStatus.running?(merge_jid)
  end

  def closed_without_fork?
    closed? && source_project_missing?
  end

  def source_project_missing?
    return false unless for_fork?
    return true unless source_project

    !source_project.in_fork_network_of?(target_project)
  end

  def reopenable?
    closed? && !source_project_missing? && source_branch_exists?
  end

  def ensure_merge_request_diff
    merge_request_diff.persisted? || create_merge_request_diff
  end

  def create_merge_request_diff
    fetch_ref!

    # n+1: https://gitlab.com/gitlab-org/gitlab-foss/issues/37435
    Gitlab::GitalyClient.allow_n_plus_1_calls do
      merge_request_diffs.create!
      reload_merge_request_diff
    end
  end

  def viewable_diffs
    @viewable_diffs ||= merge_request_diffs.viewable.to_a
  end

  def merge_request_diff_for(diff_refs_or_sha)
    matcher =
      if diff_refs_or_sha.is_a?(Gitlab::Diff::DiffRefs)
        {
          'start_commit_sha' => diff_refs_or_sha.start_sha,
          'head_commit_sha' => diff_refs_or_sha.head_sha,
          'base_commit_sha' => diff_refs_or_sha.base_sha
        }
      else
        { 'head_commit_sha' => diff_refs_or_sha }
      end

    viewable_diffs.find do |diff|
      diff.attributes.slice(*matcher.keys) == matcher
    end
  end

  def version_params_for(diff_refs)
    if diff = merge_request_diff_for(diff_refs)
      { diff_id: diff.id }
    elsif diff = merge_request_diff_for(diff_refs.head_sha)
      {
        diff_id: diff.id,
        start_sha: diff_refs.start_sha
      }
    end
  end

  def clear_memoized_shas
    @target_branch_sha = @source_branch_sha = nil

    clear_memoization(:source_branch_head)
    clear_memoization(:target_branch_head)
  end

  def reload_diff_if_branch_changed
    if (saved_change_to_source_branch? || saved_change_to_target_branch?) &&
        (source_branch_head && target_branch_head)
      reload_diff
    end
  end

  # rubocop: disable CodeReuse/ServiceClass
  def reload_diff(current_user = nil)
    return unless open?

    MergeRequests::ReloadDiffsService.new(self, current_user).execute
  end

  def check_mergeability(async: false)
    return unless recheck_merge_status?

    check_service = MergeRequests::MergeabilityCheckService.new(self)

    if async && Feature.enabled?(:async_merge_request_check_mergeability, project)
      check_service.async_execute
    else
      check_service.execute(retry_lease: false)
    end
  end
  # rubocop: enable CodeReuse/ServiceClass

  def diffable_merge_ref?
    Feature.enabled?(:diff_compare_with_head, target_project) && can_be_merged? && merge_ref_head.present?
  end

  # Returns boolean indicating the merge_status should be rechecked in order to
  # switch to either can_be_merged or cannot_be_merged.
  def recheck_merge_status?
    self.class.state_machines[:merge_status].check_state?(merge_status)
  end

  def merge_event
    @merge_event ||= target_project.events.where(target_id: self.id, target_type: "MergeRequest", action: Event::MERGED).last
  end

  def closed_event
    @closed_event ||= target_project.events.where(target_id: self.id, target_type: "MergeRequest", action: Event::CLOSED).last
  end

  def work_in_progress?
    self.class.work_in_progress?(title)
  end

  def wipless_title
    self.class.wipless_title(self.title)
  end

  def wip_title
    self.class.wip_title(self.title)
  end

  def mergeable?(skip_ci_check: false)
    return false unless mergeable_state?(skip_ci_check: skip_ci_check)

    check_mergeability

    can_be_merged? && !should_be_rebased?
  end

  def mergeable_state?(skip_ci_check: false, skip_discussions_check: false)
    return false unless open?
    return false if work_in_progress?
    return false if broken?
    return false unless skip_ci_check || mergeable_ci_state?
    return false unless skip_discussions_check || mergeable_discussions_state?

    true
  end

  def ff_merge_possible?
    project.repository.ancestor?(target_branch_sha, diff_head_sha)
  end

  def should_be_rebased?
    project.ff_merge_must_be_possible? && !ff_merge_possible?
  end

  def can_cancel_auto_merge?(current_user)
    can_be_merged_by?(current_user) || self.author == current_user
  end

  def can_remove_source_branch?(current_user)
    !ProtectedBranch.protected?(source_project, source_branch) &&
      !source_project.root_ref?(source_branch) &&
      Ability.allowed?(current_user, :push_code, source_project) &&
      diff_head_sha == source_branch_head.try(:sha)
  end

  def should_remove_source_branch?
    Gitlab::Utils.to_boolean(merge_params['should_remove_source_branch'])
  end

  def force_remove_source_branch?
    Gitlab::Utils.to_boolean(merge_params['force_remove_source_branch'])
  end

  def auto_merge_strategy
    return unless auto_merge_enabled?

    merge_params['auto_merge_strategy'] || AutoMergeService::STRATEGY_MERGE_WHEN_PIPELINE_SUCCEEDS
  end

  def auto_merge_strategy=(strategy)
    merge_params['auto_merge_strategy'] = strategy
  end

  def remove_source_branch?
    should_remove_source_branch? || force_remove_source_branch?
  end

  def notify_conflict?
    (opened? || locked?) &&
      has_commits? &&
      !branch_missing? &&
      !project.repository.can_be_merged?(diff_head_sha, target_branch)
  rescue Gitlab::Git::CommandError
    # Checking mergeability can trigger exception, e.g. non-utf8
    # We ignore this type of errors.
    false
  end

  def related_notes
    # We're using a UNION ALL here since this results in better performance
    # compared to using OR statements. We're using UNION ALL since the queries
    # used won't produce any duplicates (e.g. a note for a commit can't also be
    # a note for an MR).
    Note
      .from_union([notes, commit_notes], remove_duplicates: false)
      .includes(:noteable)
  end

  alias_method :discussion_notes, :related_notes

  def commit_notes
    # Fetch comments only from last 100 commits
    commit_ids = commit_shas(limit: 100)

    Note
      .user
      .where(project_id: [source_project_id, target_project_id])
      .for_commit_id(commit_ids)
  end

  def mergeable_discussions_state?
    return true unless project.only_allow_merge_if_all_discussions_are_resolved?

    unresolved_notes.none?(&:to_be_resolved?)
  end

  def for_fork?
    target_project != source_project
  end

  # If the merge request closes any issues, save this information in the
  # `MergeRequestsClosingIssues` model. This is a performance optimization.
  # Calculating this information for a number of merge requests requires
  # running `ReferenceExtractor` on each of them separately.
  # This optimization does not apply to issues from external sources.
  def cache_merge_request_closes_issues!(current_user = self.author)
    return unless project.issues_enabled?
    return if closed? || merged?

    transaction do
      self.merge_requests_closing_issues.delete_all

      closes_issues(current_user).each do |issue|
        next if issue.is_a?(ExternalIssue)

        self.merge_requests_closing_issues.create!(issue: issue)
      end
    end
  end

  def visible_closing_issues_for(current_user = self.author)
    strong_memoize(:visible_closing_issues_for) do
      if self.target_project.has_external_issue_tracker?
        closes_issues(current_user)
      else
        cached_closes_issues.select do |issue|
          Ability.allowed?(current_user, :read_issue, issue)
        end
      end
    end
  end

  # Return the set of issues that will be closed if this merge request is accepted.
  def closes_issues(current_user = self.author)
    if target_branch == project.default_branch
      messages = [title, description]
      messages.concat(commits.map(&:safe_message)) if merge_request_diff.persisted?

      Gitlab::ClosingIssueExtractor.new(project, current_user)
        .closed_by_message(messages.join("\n"))
    else
      []
    end
  end

  def issues_mentioned_but_not_closing(current_user)
    return [] unless target_branch == project.default_branch

    ext = Gitlab::ReferenceExtractor.new(project, current_user)
    ext.analyze("#{title}\n#{description}")

    ext.issues - visible_closing_issues_for(current_user)
  end

  def target_project_path
    if target_project
      target_project.full_path
    else
      "(removed)"
    end
  end

  def source_project_path
    if source_project
      source_project.full_path
    else
      "(removed)"
    end
  end

  def source_project_namespace
    if source_project && source_project.namespace
      source_project.namespace.full_path
    else
      "(removed)"
    end
  end

  def target_project_namespace
    if target_project && target_project.namespace
      target_project.namespace.full_path
    else
      "(removed)"
    end
  end

  def source_branch_exists?
    return false unless self.source_project

    self.source_project.repository.branch_exists?(self.source_branch)
  end

  def target_branch_exists?
    return false unless self.target_project

    self.target_project.repository.branch_exists?(self.target_branch)
  end

  def default_merge_commit_message(include_description: false)
    closes_issues_references = visible_closing_issues_for.map do |issue|
      issue.to_reference(target_project)
    end

    message = [
      "Merge branch '#{source_branch}' into '#{target_branch}'",
      title
    ]

    if !include_description && closes_issues_references.present?
      message << "Closes #{closes_issues_references.to_sentence}"
    end

    message << "#{description}" if include_description && description.present?
    message << "See merge request #{to_reference(full: true)}"

    message.join("\n\n")
  end

  # Returns the oldest multi-line commit message, or the MR title if none found
  def default_squash_commit_message
    strong_memoize(:default_squash_commit_message) do
      recent_commits.without_merge_commits.reverse_each.find(&:description?)&.safe_message || title
    end
  end

  # Return array of possible target branches
  # depends on target project of MR
  def target_branches
    if target_project.nil?
      []
    else
      target_project.repository.branch_names
    end
  end

  # Return array of possible source branches
  # depends on source project of MR
  def source_branches
    if source_project.nil?
      []
    else
      source_project.repository.branch_names
    end
  end

  def has_ci?
    return false if has_no_commits?

    !!(head_pipeline_id || all_pipelines.any? || source_project&.ci_service)
  end

  def branch_missing?
    !source_branch_exists? || !target_branch_exists?
  end

  def broken?
    has_no_commits? || branch_missing? || cannot_be_merged?
  end

  def can_be_merged_by?(user)
    access = ::Gitlab::UserAccess.new(user, project: project)
    access.can_update_branch?(target_branch)
  end

  def can_be_merged_via_command_line_by?(user)
    access = ::Gitlab::UserAccess.new(user, project: project)
    access.can_push_to_branch?(target_branch)
  end

  def mergeable_ci_state?
    return true unless project.only_allow_merge_if_pipeline_succeeds?
    return false unless actual_head_pipeline

    actual_head_pipeline.success?
  end

  def environments_for(current_user, latest: false)
    return [] unless diff_head_commit

    envs = EnvironmentsFinder.new(target_project, current_user,
      ref: target_branch, commit: diff_head_commit, with_tags: true, find_latest: latest).execute

    if source_project
      envs.concat EnvironmentsFinder.new(source_project, current_user,
        ref: source_branch, commit: diff_head_commit, find_latest: latest).execute
    end

    envs.uniq
  end

  ##
  # This method is for looking for active environments which created via pipelines for merge requests.
  # Since deployments run on a merge request ref (e.g. `refs/merge-requests/:iid/head`),
  # we cannot look up environments with source branch name.
  def environments
    return Environment.none unless actual_head_pipeline&.merge_request?

    actual_head_pipeline.environments
  end

  def fetch_ref!
    target_project.repository.fetch_source_branch!(source_project.repository, source_branch, ref_path)
  end

  # Returns the current merge-ref HEAD commit.
  #
  def merge_ref_head
    project.repository.commit(merge_ref_path)
  end

  def ref_path
    "refs/#{Repository::REF_MERGE_REQUEST}/#{iid}/head"
  end

  def merge_ref_path
    "refs/#{Repository::REF_MERGE_REQUEST}/#{iid}/merge"
  end

  def train_ref_path
    "refs/#{Repository::REF_MERGE_REQUEST}/#{iid}/train"
  end

  def cleanup_refs(only: :all)
    target_refs = []
    target_refs << ref_path       if %i[all head].include?(only)
    target_refs << merge_ref_path if %i[all merge].include?(only)
    target_refs << train_ref_path if %i[all train].include?(only)

    project.repository.delete_refs(*target_refs)
  end

  def self.merge_request_ref?(ref)
    ref.start_with?("refs/#{Repository::REF_MERGE_REQUEST}/")
  end

  def self.merge_train_ref?(ref)
    %r{\Arefs/#{Repository::REF_MERGE_REQUEST}/\d+/train\z}.match?(ref)
  end

  def in_locked_state
    lock_mr
    yield
  ensure
    unlock_mr
  end

  def diverged_commits_count
    cache = Rails.cache.read(:"merge_request_#{id}_diverged_commits")

    if cache.blank? || cache[:source_sha] != source_branch_sha || cache[:target_sha] != target_branch_sha
      cache = {
        source_sha: source_branch_sha,
        target_sha: target_branch_sha,
        diverged_commits_count: compute_diverged_commits_count
      }
      Rails.cache.write(:"merge_request_#{id}_diverged_commits", cache)
    end

    cache[:diverged_commits_count]
  end

  def compute_diverged_commits_count
    return 0 unless source_branch_sha && target_branch_sha

    target_project.repository
      .count_commits_between(source_branch_sha, target_branch_sha)
  end
  private :compute_diverged_commits_count

  def diverged_from_target_branch?
    diverged_commits_count > 0
  end

  def all_pipelines
    strong_memoize(:all_pipelines) do
      Ci::PipelinesForMergeRequestFinder.new(self).all
    end
  end

  def update_head_pipeline
    find_actual_head_pipeline.try do |pipeline|
      self.head_pipeline = pipeline
      update_column(:head_pipeline_id, head_pipeline.id) if head_pipeline_id_changed?
    end
  end

  def has_test_reports?
    actual_head_pipeline&.has_reports?(Ci::JobArtifact.test_reports)
  end

  def predefined_variables
    Gitlab::Ci::Variables::Collection.new.tap do |variables|
      variables.append(key: 'CI_MERGE_REQUEST_ID', value: id.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_IID', value: iid.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_REF_PATH', value: ref_path.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_PROJECT_ID', value: project.id.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_PROJECT_PATH', value: project.full_path)
      variables.append(key: 'CI_MERGE_REQUEST_PROJECT_URL', value: project.web_url)
      variables.append(key: 'CI_MERGE_REQUEST_TARGET_BRANCH_NAME', value: target_branch.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_TITLE', value: title)
      variables.append(key: 'CI_MERGE_REQUEST_ASSIGNEES', value: assignee_username_list) if assignees.any?
      variables.append(key: 'CI_MERGE_REQUEST_MILESTONE', value: milestone.title) if milestone
      variables.append(key: 'CI_MERGE_REQUEST_LABELS', value: label_names.join(',')) if labels.present?
      variables.concat(source_project_variables)
    end
  end

  def compare_test_reports
    unless has_test_reports?
      return { status: :error, status_reason: 'This merge request does not have test reports' }
    end

    compare_reports(Ci::CompareTestReportsService)
  end

  def has_exposed_artifacts?
    return false unless Feature.enabled?(:ci_expose_arbitrary_artifacts_in_mr, default_enabled: true)

    actual_head_pipeline&.has_exposed_artifacts?
  end

  # TODO: this method and compare_test_reports use the same
  # result type, which is handled by the controller's #reports_response.
  # we should minimize mistakes by isolating the common parts.
  # issue: https://gitlab.com/gitlab-org/gitlab/issues/34224
  def find_exposed_artifacts
    unless has_exposed_artifacts?
      return { status: :error, status_reason: 'This merge request does not have exposed artifacts' }
    end

    compare_reports(Ci::GenerateExposedArtifactsReportService)
  end

  # TODO: consider renaming this as with exposed artifacts we generate reports,
  # not always compare
  # issue: https://gitlab.com/gitlab-org/gitlab/issues/34224
  def compare_reports(service_class, current_user = nil)
    with_reactive_cache(service_class.name, current_user&.id) do |data|
      unless service_class.new(project, current_user)
        .latest?(base_pipeline, actual_head_pipeline, data)
        raise InvalidateReactiveCache
      end

      data
    end || { status: :parsing }
  end

  def calculate_reactive_cache(identifier, current_user_id = nil, *args)
    service_class = identifier.constantize

    # TODO: the type check should change to something that includes exposed artifacts service
    # issue: https://gitlab.com/gitlab-org/gitlab/issues/34224
    raise NameError, service_class unless service_class < Ci::CompareReportsBaseService

    current_user = User.find_by(id: current_user_id)
    service_class.new(project, current_user).execute(base_pipeline, actual_head_pipeline)
  end

  def all_commits
    MergeRequestDiffCommit
      .where(merge_request_diff: merge_request_diffs.recent)
      .limit(10_000)
  end

  # Note that this could also return SHA from now dangling commits
  #
  def all_commit_shas
    @all_commit_shas ||= begin
      return commit_shas unless persisted?

      all_commits.pluck(:sha).uniq
    end
  end

  def merge_commit
    @merge_commit ||= project.commit(merge_commit_sha) if merge_commit_sha
  end

  def short_merge_commit_sha
    Commit.truncate_sha(merge_commit_sha) if merge_commit_sha
  end

  def can_be_reverted?(current_user)
    return false unless merge_commit
    return false unless merged_at

    # It is not guaranteed that Note#created_at will be strictly later than
    # MergeRequestMetric#merged_at. Nanoseconds on MySQL may break this
    # comparison, as will a HA environment if clocks are not *precisely*
    # synchronized. Add a minute's leeway to compensate for both possibilities
    cutoff = merged_at - 1.minute

    notes_association = notes_with_associations.where('created_at >= ?', cutoff)

    !merge_commit.has_been_reverted?(current_user, notes_association)
  end

  def merged_at
    strong_memoize(:merged_at) do
      next unless merged?

      metrics&.merged_at ||
        merge_event&.created_at ||
        notes.system.reorder(nil).find_by(note: 'merged')&.created_at
    end
  end

  def can_be_cherry_picked?
    merge_commit.present?
  end

  def has_complete_diff_refs?
    diff_refs && diff_refs.complete?
  end

  # rubocop: disable CodeReuse/ServiceClass
  def update_diff_discussion_positions(old_diff_refs:, new_diff_refs:, current_user: nil)
    return unless has_complete_diff_refs?
    return if new_diff_refs == old_diff_refs

    active_diff_discussions = self.notes.new_diff_notes.discussions.select do |discussion|
      discussion.active?(old_diff_refs)
    end
    return if active_diff_discussions.empty?

    paths = active_diff_discussions.flat_map { |n| n.diff_file.paths }.uniq

    service = Discussions::UpdateDiffPositionService.new(
      self.project,
      current_user,
      old_diff_refs: old_diff_refs,
      new_diff_refs: new_diff_refs,
      paths: paths
    )

    active_diff_discussions.each do |discussion|
      service.execute(discussion)
    end

    if project.resolve_outdated_diff_discussions?
      MergeRequests::ResolvedDiscussionNotificationService
        .new(project, current_user)
        .execute(self)
    end
  end
  # rubocop: enable CodeReuse/ServiceClass

  def keep_around_commit
    project.repository.keep_around(self.merge_commit_sha)
  end

  def has_commits?
    merge_request_diff.persisted? && commits_count.to_i > 0
  end

  def has_no_commits?
    !has_commits?
  end

  def mergeable_with_quick_action?(current_user, autocomplete_precheck: false, last_diff_sha: nil)
    return false unless can_be_merged_by?(current_user)

    return true if autocomplete_precheck

    return false unless mergeable?(skip_ci_check: true)
    return false if actual_head_pipeline && !(actual_head_pipeline.success? || actual_head_pipeline.active?)
    return false if last_diff_sha != diff_head_sha

    true
  end

  def pipeline_coverage_delta
    if base_pipeline&.coverage && head_pipeline&.coverage
      '%.2f' % (head_pipeline.coverage.to_f - base_pipeline.coverage.to_f)
    end
  end

  def base_pipeline
    @base_pipeline ||= project.ci_pipelines
      .order(id: :desc)
      .find_by(sha: diff_base_sha, ref: target_branch)
  end

  def discussions_rendered_on_frontend?
    true
  end

  # rubocop: disable CodeReuse/ServiceClass
  def update_project_counter_caches
    Projects::OpenMergeRequestsCountService.new(target_project).refresh_cache
  end
  # rubocop: enable CodeReuse/ServiceClass

  def first_contribution?
    return false if project.team.max_member_access(author_id) > Gitlab::Access::GUEST

    project.merge_requests.merged.where(author_id: author_id).empty?
  end

  # TODO: remove once production database rename completes
  # https://gitlab.com/gitlab-org/gitlab-foss/issues/47592
  alias_attribute :allow_collaboration, :allow_maintainer_to_push

  def allow_collaboration
    collaborative_push_possible? && allow_maintainer_to_push
  end

  alias_method :allow_collaboration?, :allow_collaboration

  def collaborative_push_possible?
    source_project.present? && for_fork? &&
      target_project.visibility_level > Gitlab::VisibilityLevel::PRIVATE &&
      source_project.visibility_level > Gitlab::VisibilityLevel::PRIVATE &&
      !ProtectedBranch.protected?(source_project, source_branch)
  end

  def can_allow_collaboration?(user)
    collaborative_push_possible? &&
      Ability.allowed?(user, :push_code, source_project)
  end

  def squash_in_progress?
    # The source project can be deleted
    return false unless source_project

    source_project.repository.squash_in_progress?(id)
  end

  def find_actual_head_pipeline
    all_pipelines.for_sha_or_source_sha(diff_head_sha).first
  end

  def etag_caching_enabled?
    true
  end

  def recent_visible_deployments
    deployments.visible.includes(:environment).order(id: :desc).limit(10)
  end

  private

  def with_rebase_lock
    if Feature.enabled?(:merge_request_rebase_nowait_lock, default_enabled: true)
      with_retried_nowait_lock { yield }
    else
      with_lock(true) { yield }
    end
  end

  # If the merge request is idle in transaction or has a SELECT FOR
  # UPDATE, we don't want to block indefinitely or this could cause a
  # queue of SELECT FOR UPDATE calls. Instead, try to get the lock for
  # 5 s before raising an error to the user.
  def with_retried_nowait_lock
    # Try at most 0.25 + (1.5 * .25) + (1.5^2 * .25) ... (1.5^5 * .25) = 5.2 s to get the lock
    Retriable.retriable(on: ActiveRecord::LockWaitTimeout, tries: 6, base_interval: 0.25) do
      with_lock('FOR UPDATE NOWAIT') do
        yield
      end
    end
  rescue ActiveRecord::LockWaitTimeout => e
    Gitlab::ErrorTracking.track_exception(e)
    raise RebaseLockTimeout, _('Failed to enqueue the rebase operation, possibly due to a long-lived transaction. Try again later.')
  end

  def source_project_variables
    Gitlab::Ci::Variables::Collection.new.tap do |variables|
      break variables unless source_project

      variables.append(key: 'CI_MERGE_REQUEST_SOURCE_PROJECT_ID', value: source_project.id.to_s)
      variables.append(key: 'CI_MERGE_REQUEST_SOURCE_PROJECT_PATH', value: source_project.full_path)
      variables.append(key: 'CI_MERGE_REQUEST_SOURCE_PROJECT_URL', value: source_project.web_url)
      variables.append(key: 'CI_MERGE_REQUEST_SOURCE_BRANCH_NAME', value: source_branch.to_s)
    end
  end

  def expire_etag_cache
    return unless project.namespace

    key = Gitlab::Routing.url_helpers.cached_widget_project_json_merge_request_path(project, self, format: :json)
    Gitlab::EtagCaching::Store.new.touch(key)
  end
end

MergeRequest.prepend_if_ee('::EE::MergeRequest')