36 lines
1.1 KiB
Ruby
36 lines
1.1 KiB
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
|
|
# for more information on how to write migrations for GitLab.
|
|
|
|
# rubocop:disable RemoveIndex
|
|
class MergeRequestDiffRemoveUniq < ActiveRecord::Migration[4.2]
|
|
include Gitlab::Database::MigrationHelpers
|
|
disable_ddl_transaction!
|
|
|
|
DOWNTIME = false
|
|
|
|
def up
|
|
constraint_name = 'merge_request_diffs_merge_request_id_key'
|
|
|
|
transaction do
|
|
if index_exists?(:merge_request_diffs, :merge_request_id)
|
|
remove_index(:merge_request_diffs, :merge_request_id)
|
|
end
|
|
|
|
# In some bizarre cases PostgreSQL might have a separate unique constraint
|
|
# that we'll need to drop.
|
|
if constraint_exists?(constraint_name) && Gitlab::Database.postgresql?
|
|
execute("ALTER TABLE merge_request_diffs DROP CONSTRAINT IF EXISTS #{constraint_name};")
|
|
end
|
|
end
|
|
end
|
|
|
|
def down
|
|
unless index_exists?(:merge_request_diffs, :merge_request_id)
|
|
add_concurrent_index(:merge_request_diffs, :merge_request_id, unique: true)
|
|
end
|
|
end
|
|
|
|
def constraint_exists?(name)
|
|
indexes(:merge_request_diffs).map(&:name).include?(name)
|
|
end
|
|
end
|