Add latest changes from gitlab-org/gitlab@master

1 files changed, 27 insertions, 0 deletions

diff --git a/db/migrate/20190830140240_add_duplicated_to_to_issue.rb b/db/migrate/20190830140240_add_duplicated_to_to_issue.rb
new file mode 100644
index 00000000000..b38e4302a0b
--- /dev/null
+++ b/db/migrate/20190830140240_add_duplicated_to_to_issue.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class AddDuplicatedToToIssue < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column :issues, :duplicated_to_id, :integer unless duplicated_to_id_exists?
+    add_concurrent_foreign_key :issues, :issues, column: :duplicated_to_id, on_delete: :nullify
+    add_concurrent_index :issues, :duplicated_to_id, where: 'duplicated_to_id IS NOT NULL'
+  end
+
+  def down
+    remove_foreign_key_without_error(:issues, column: :duplicated_to_id)
+    remove_concurrent_index(:issues, :duplicated_to_id)
+    remove_column(:issues, :duplicated_to_id) if duplicated_to_id_exists?
+  end
+
+  private
+
+  def duplicated_to_id_exists?
+    column_exists?(:issues, :duplicated_to_id)
+  end
+end