1 files changed, 35 insertions, 0 deletions
diff --git a/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
new file mode 100644
index 00000000000..229298e1946
--- /dev/null
+++ b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
@@ -0,0 +1,35 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class CorrectProtectedTagsForeignKeys < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_foreign_key_without_error(:protected_tag_create_access_levels,
+                                     column: :protected_tag_id)
+
+    execute <<-EOF
+    DELETE FROM protected_tag_create_access_levels
+    WHERE NOT EXISTS (
+      SELECT true
+      FROM protected_tags
+      WHERE protected_tag_create_access_levels.protected_tag_id = protected_tags.id
+    )
+    AND protected_tag_id IS NOT NULL
+    EOF
+
+    add_concurrent_foreign_key(:protected_tag_create_access_levels,
+                               :protected_tags,
+                               column: :protected_tag_id)
+  end
+
+  def down
+    # Previously there was a foreign key without a CASCADING DELETE, so we'll
+    # just leave the foreign key in place.
+  end
+end