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compatibility.rb
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compatibility.rb
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# frozen_string_literal: true
module ActiveRecord
class Migration
module Compatibility # :nodoc: all
def self.find(version)
version = version.to_s
name = "V#{version.tr('.', '_')}"
unless const_defined?(name)
versions = constants.grep(/\AV[0-9_]+\z/).map { |s| s.to_s.delete("V").tr("_", ".").inspect }
raise ArgumentError, "Unknown migration version #{version.inspect}; expected one of #{versions.sort.join(', ')}"
end
const_get(name)
end
# This file exists to ensure that old migrations run the same way they did before a Rails upgrade.
# eg. if you write a migration on Rails 6.1, then upgrade to Rails 7, the migration should do the same thing to your
# database as it did when you were running Rails 6.1
#
# "Current" is an alias for `ActiveRecord::Migration`, it represents the current Rails version.
# New migration functionality that will never be backward compatible should be added directly to `ActiveRecord::Migration`.
#
# There are classes for each prior Rails version. Each class descends from the *next* Rails version, so:
# 6.1 < 7.0
# 5.2 < 6.0 < 6.1 < 7.0
#
# If you are introducing new migration functionality that should only apply from Rails 7 onward, then you should
# find the class that immediately precedes it (6.1), and override the relevant migration methods to undo your changes.
#
# For example, Rails 6 added a default value for the `precision` option on datetime columns. So in this file, the `V5_2`
# class sets the value of `precision` to `nil` if it's not explicitly provided. This way, the default value will not apply
# for migrations written for 5.2, but will for migrations written for 6.0.
V7_0 = Current
class V6_1 < V7_0
class PostgreSQLCompat
def self.compatible_timestamp_type(type, connection)
if connection.adapter_name == "PostgreSQL"
# For Rails <= 6.1, :datetime was aliased to :timestamp
# See: https://github.com/rails/rails/blob/v6.1.3.2/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L108
# From Rails 7 onwards, you can define what :datetime resolves to (the default is still :timestamp)
# See `ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type`
type.to_sym == :datetime ? :timestamp : type
else
type
end
end
end
def add_column(table_name, column_name, type, **options)
type = PostgreSQLCompat.compatible_timestamp_type(type, connection)
super
end
def create_table(table_name, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
module TableDefinition
def new_column_definition(name, type, **options)
type = PostgreSQLCompat.compatible_timestamp_type(type, @conn)
super
end
end
private
def compatible_table_definition(t)
class << t
prepend TableDefinition
end
t
end
end
class V6_0 < V6_1
class ReferenceDefinition < ConnectionAdapters::ReferenceDefinition
def index_options(table_name)
as_options(index)
end
end
module TableDefinition
def references(*args, **options)
args.each do |ref_name|
ReferenceDefinition.new(ref_name, **options).add_to(self)
end
end
alias :belongs_to :references
end
def create_table(table_name, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def change_table(table_name, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def create_join_table(table_1, table_2, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def add_reference(table_name, ref_name, **options)
ReferenceDefinition.new(ref_name, **options)
.add_to(connection.update_table_definition(table_name, self))
end
alias :add_belongs_to :add_reference
private
def compatible_table_definition(t)
class << t
prepend TableDefinition
end
t
end
end
class V5_2 < V6_0
module TableDefinition
def timestamps(**options)
options[:precision] ||= nil
super
end
end
module CommandRecorder
def invert_transaction(args, &block)
[:transaction, args, block]
end
def invert_change_column_comment(args)
[:change_column_comment, args]
end
def invert_change_table_comment(args)
[:change_table_comment, args]
end
end
def create_table(table_name, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def change_table(table_name, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def create_join_table(table_1, table_2, **options)
if block_given?
super { |t| yield compatible_table_definition(t) }
else
super
end
end
def add_timestamps(table_name, **options)
options[:precision] ||= nil
super
end
private
def compatible_table_definition(t)
class << t
prepend TableDefinition
end
t
end
def command_recorder
recorder = super
class << recorder
prepend CommandRecorder
end
recorder
end
end
class V5_1 < V5_2
def change_column(table_name, column_name, type, **options)
if connection.adapter_name == "PostgreSQL"
super(table_name, column_name, type, **options.except(:default, :null, :comment))
connection.change_column_default(table_name, column_name, options[:default]) if options.key?(:default)
connection.change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null)
connection.change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
else
super
end
end
def create_table(table_name, **options)
if connection.adapter_name == "Mysql2"
super(table_name, options: "ENGINE=InnoDB", **options)
else
super
end
end
end
class V5_0 < V5_1
module TableDefinition
def primary_key(name, type = :primary_key, **options)
type = :integer if type == :primary_key
super
end
def references(*args, **options)
super(*args, type: :integer, **options)
end
alias :belongs_to :references
end
def create_table(table_name, **options)
if connection.adapter_name == "PostgreSQL"
if options[:id] == :uuid && !options.key?(:default)
options[:default] = "uuid_generate_v4()"
end
end
unless connection.adapter_name == "Mysql2" && options[:id] == :bigint
if [:integer, :bigint].include?(options[:id]) && !options.key?(:default)
options[:default] = nil
end
end
# Since 5.1 PostgreSQL adapter uses bigserial type for primary
# keys by default and MySQL uses bigint. This compat layer makes old migrations utilize
# serial/int type instead -- the way it used to work before 5.1.
unless options.key?(:id)
options[:id] = :integer
end
super
end
def create_join_table(table_1, table_2, column_options: {}, **options)
column_options.reverse_merge!(type: :integer)
super
end
def add_column(table_name, column_name, type, **options)
if type == :primary_key
type = :integer
options[:primary_key] = true
end
super
end
def add_reference(table_name, ref_name, **options)
super(table_name, ref_name, type: :integer, **options)
end
alias :add_belongs_to :add_reference
private
def compatible_table_definition(t)
class << t
prepend TableDefinition
end
super
end
end
class V4_2 < V5_0
module TableDefinition
def references(*, **options)
options[:index] ||= false
super
end
alias :belongs_to :references
def timestamps(**options)
options[:null] = true if options[:null].nil?
super
end
def column(name, type, index: nil, **options)
options[:precision] ||= nil
super
end
end
def add_reference(table_name, ref_name, **options)
options[:index] ||= false
super
end
alias :add_belongs_to :add_reference
def add_timestamps(table_name, **options)
options[:null] = true if options[:null].nil?
super
end
def index_exists?(table_name, column_name, **options)
column_names = Array(column_name).map(&:to_s)
options[:name] =
if options[:name].present?
options[:name].to_s
else
connection.index_name(table_name, column: column_names)
end
super
end
def remove_index(table_name, column_name = nil, **options)
options[:name] = index_name_for_remove(table_name, column_name, options)
super
end
def add_column(table_name, column_name, type, **options)
if type == :datetime
options[:precision] ||= nil
end
super
end
private
def compatible_table_definition(t)
class << t
prepend TableDefinition
end
super
end
def index_name_for_remove(table_name, column_name, options)
index_name = connection.index_name(table_name, column_name || options)
unless connection.index_name_exists?(table_name, index_name)
if options.key?(:name)
options_without_column = options.except(:column)
index_name_without_column = connection.index_name(table_name, options_without_column)
if connection.index_name_exists?(table_name, index_name_without_column)
return index_name_without_column
end
end
raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' does not exist"
end
index_name
end
end
end
end
end