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# frozen_string_literal: true
module Gitlab
module Database
class Migration
module LockRetriesConcern
extend ActiveSupport::Concern
class_methods do
def enable_lock_retries!
@enable_lock_retries = true # rubocop:disable Gitlab/ModuleWithInstanceVariables
end
def enable_lock_retries?
@enable_lock_retries
end
end
delegate :enable_lock_retries?, to: :class
end
# This implements a simple versioning scheme for migration helpers.
#
# We need to be able to version helpers, so we can change their behavior without
# altering the behavior of already existing migrations in incompatible ways.
#
# We can continue to change the behavior of helpers without bumping the version here,
# *if* the change is backwards-compatible.
#
# If not, we would typically override the helper method in a new MigrationHelpers::V[0-9]+
# class and create a new entry with a bumped version below.
#
# We use major version bumps to indicate significant changes and minor version bumps
# to indicate backwards-compatible or otherwise minor changes (e.g. a Rails version bump).
# However, this hasn't been strictly formalized yet.
MIGRATION_CLASSES = {
1.0 => Class.new(ActiveRecord::Migration[6.1]) do
include LockRetriesConcern
include Gitlab::Database::MigrationHelpers::V2
end
}.freeze
def self.[](version)
MIGRATION_CLASSES[version] || raise(ArgumentError, "Unknown migration version: #{version}")
end
# The current version to be used in new migrations
def self.current_version
1.0
end
end
end
end
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