1 files changed, 36 insertions, 0 deletions
diff --git a/db/post_migrate/20200325162730_schedule_backfill_push_rules_id_in_projects.rb b/db/post_migrate/20200325162730_schedule_backfill_push_rules_id_in_projects.rb
new file mode 100644
index 00000000000..b25b3365e12
--- /dev/null
+++ b/db/post_migrate/20200325162730_schedule_backfill_push_rules_id_in_projects.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class ScheduleBackfillPushRulesIdInProjects < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  MIGRATION = 'BackfillPushRulesIdInProjects'.freeze
+  BATCH_SIZE = 1_000
+
+  class PushRules < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'push_rules'
+  end
+
+  def up
+    # Update one record that is connected to the instance
+    value_to_be_updated_to = ScheduleBackfillPushRulesIdInProjects::PushRules.find_by(is_sample: true)&.id
+
+    execute "UPDATE application_settings SET push_rule_id = #{value_to_be_updated_to}" if value_to_be_updated_to
+
+    ApplicationSetting.expire
+
+    queue_background_migration_jobs_by_range_at_intervals(ScheduleBackfillPushRulesIdInProjects::PushRules,
+                                                          MIGRATION,
+                                                          5.minutes,
+                                                          batch_size: BATCH_SIZE)
+  end
+
+  def down
+    execute "UPDATE application_settings SET push_rule_id = NULL"
+
+    ApplicationSetting.expire
+  end
+end