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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class MergeRequestDiffRemoveUniq < ActiveRecord::Migration
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
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