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-rw-r--r--changelogs/unreleased/rails5-fix-mysql-arel-from.yml5
-rw-r--r--lib/gitlab/database/median.rb8
2 files changed, 12 insertions, 1 deletions
diff --git a/changelogs/unreleased/rails5-fix-mysql-arel-from.yml b/changelogs/unreleased/rails5-fix-mysql-arel-from.yml
new file mode 100644
index 00000000000..9883ff306f1
--- /dev/null
+++ b/changelogs/unreleased/rails5-fix-mysql-arel-from.yml
@@ -0,0 +1,5 @@
+---
+title: Rails5 fix arel from in mysql_median_datetime_sql
+merge_request: 20167
+author: Jasper Maes
+type: fixed
diff --git a/lib/gitlab/database/median.rb b/lib/gitlab/database/median.rb
index 3cac007a42c..f64e3d53138 100644
--- a/lib/gitlab/database/median.rb
+++ b/lib/gitlab/database/median.rb
@@ -33,7 +33,13 @@ module Gitlab
end
def mysql_median_datetime_sql(arel_table, query_so_far, column_sym)
- query = arel_table
+ arel_from = if Gitlab.rails5?
+ arel_table.from
+ else
+ arel_table
+ end
+
+ query = arel_from
.from(arel_table.project(Arel.sql('*')).order(arel_table[column_sym]).as(arel_table.table_name))
.project(average([arel_table[column_sym]], 'median'))
.where(