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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
if index_exists?(:merge_request_diffs, :merge_request_id)
remove_index :merge_request_diffs, :merge_request_id
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
end
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