diff options
Diffstat (limited to 'db/migrate/20170516183131_add_indices_to_issue_assignees.rb')
| -rw-r--r-- | db/migrate/20170516183131_add_indices_to_issue_assignees.rb | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/db/migrate/20170516183131_add_indices_to_issue_assignees.rb b/db/migrate/20170516183131_add_indices_to_issue_assignees.rb new file mode 100644 index 00000000000..a1f064c6848 --- /dev/null +++ b/db/migrate/20170516183131_add_indices_to_issue_assignees.rb @@ -0,0 +1,41 @@ +# See http://doc.gitlab.com/ce/development/migration_style_guide.html +# for more information on how to write migrations for GitLab. + +class AddIndicesToIssueAssignees < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + # Set this constant to true if this migration requires downtime. + DOWNTIME = false + + # When a migration requires downtime you **must** uncomment the following + # constant and define a short and easy to understand explanation as to why the + # migration requires downtime. + # DOWNTIME_REASON = '' + + # When using the methods "add_concurrent_index", "remove_concurrent_index" or + # "add_column_with_default" you must disable the use of transactions + # as these methods can not run in an existing transaction. + # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure + # that either of them is the _only_ method called in the migration, + # any other changes should go in a separate migration. + # This ensures that upon failure _only_ the index creation or removing fails + # and can be retried or reverted easily. + # + # To disable transactions uncomment the following line and remove these + # comments: + disable_ddl_transaction! + + def up + add_concurrent_index :issue_assignees, [:issue_id, :user_id], unique: true, name: 'index_issue_assignees_on_issue_id_and_user_id' + add_concurrent_index :issue_assignees, :user_id, name: 'index_issue_assignees_on_user_id' + add_concurrent_foreign_key :issue_assignees, :users, column: :user_id, on_delete: :cascade + add_concurrent_foreign_key :issue_assignees, :issues, column: :issue_id, on_delete: :cascade + end + + def down + remove_foreign_key :issue_assignees, column: :user_id + remove_foreign_key :issue_assignees, column: :issue_id + remove_concurrent_index :issue_assignees, [:issue_id, :user_id] if index_exists?(:issue_assignees, [:issue_id, :user_id]) + remove_concurrent_index :issue_assignees, :user_id if index_exists?(:issue_assignees, :user_id) + end +end |