diff options
Diffstat (limited to 'activerecord/lib/active_record/migration')
| -rw-r--r-- | activerecord/lib/active_record/migration/command_recorder.rb | 77 | ||||
| -rw-r--r-- | activerecord/lib/active_record/migration/compatibility.rb | 91 |
2 files changed, 150 insertions, 18 deletions
diff --git a/activerecord/lib/active_record/migration/command_recorder.rb b/activerecord/lib/active_record/migration/command_recorder.rb index 36256415df..0fa665c7e0 100644 --- a/activerecord/lib/active_record/migration/command_recorder.rb +++ b/activerecord/lib/active_record/migration/command_recorder.rb @@ -5,15 +5,36 @@ module ActiveRecord # knows how to invert the following commands: # # * add_column + # * add_foreign_key # * add_index + # * add_reference # * add_timestamps - # * create_table + # * change_column + # * change_column_default (must supply a :from and :to option) + # * change_column_null # * create_join_table + # * create_table + # * disable_extension + # * drop_join_table + # * drop_table (must supply a block) + # * enable_extension + # * remove_column (must supply a type) + # * remove_columns (must specify at least one column name or more) + # * remove_foreign_key (must supply a second table) + # * remove_index + # * remove_reference # * remove_timestamps # * rename_column # * rename_index # * rename_table class CommandRecorder + ReversibleAndIrreversibleMethods = [:create_table, :create_join_table, :rename_table, :add_column, :remove_column, + :rename_index, :rename_column, :add_index, :remove_index, :add_timestamps, :remove_timestamps, + :change_column_default, :add_reference, :remove_reference, :transaction, + :drop_join_table, :drop_table, :execute_block, :enable_extension, :disable_extension, + :change_column, :execute, :remove_columns, :change_column_null, + :add_foreign_key, :remove_foreign_key + ] include JoinTable attr_accessor :commands, :delegate, :reverting @@ -41,7 +62,7 @@ module ActiveRecord @reverting = !@reverting end - # record +command+. +command+ should be a method name and arguments. + # Record +command+. +command+ should be a method name and arguments. # For example: # # recorder.record(:method_name, [:arg1, :arg2]) @@ -62,7 +83,12 @@ module ActiveRecord # invert the +command+. def inverse_of(command, args, &block) method = :"invert_#{command}" - raise IrreversibleMigration unless respond_to?(method, true) + raise IrreversibleMigration, <<-MSG.strip_heredoc unless respond_to?(method, true) + This migration uses #{command}, which is not automatically reversible. + To make the migration reversible you can either: + 1. Define #up and #down methods in place of the #change method. + 2. Use the #reversible method to define reversible behavior. + MSG send(method, args, &block) end @@ -70,14 +96,7 @@ module ActiveRecord super || delegate.respond_to?(*args) end - [:create_table, :create_join_table, :rename_table, :add_column, :remove_column, - :rename_index, :rename_column, :add_index, :remove_index, :add_timestamps, :remove_timestamps, - :change_column_default, :add_reference, :remove_reference, :transaction, - :drop_join_table, :drop_table, :execute_block, :enable_extension, - :change_column, :execute, :remove_columns, :change_column_null, - :add_foreign_key, :remove_foreign_key - # irreversible methods need to be here too - ].each do |method| + ReversibleAndIrreversibleMethods.each do |method| class_eval <<-EOV, __FILE__, __LINE__ + 1 def #{method}(*args, &block) # def create_table(*args, &block) record(:"#{method}", args, &block) # record(:create_table, args, &block) @@ -151,19 +170,31 @@ module ActiveRecord end def invert_remove_index(args) - table, options = *args - - unless options && options.is_a?(Hash) && options[:column] - raise ActiveRecord::IrreversibleMigration, "remove_index is only reversible if given a :column option." + table, options_or_column = *args + if (options = options_or_column).is_a?(Hash) + unless options[:column] + raise ActiveRecord::IrreversibleMigration, "remove_index is only reversible if given a :column option." + end + options = options.dup + [:add_index, [table, options.delete(:column), options]] + elsif (column = options_or_column).present? + [:add_index, [table, column]] end - - options = options.dup - [:add_index, [table, options.delete(:column), options]] end alias :invert_add_belongs_to :invert_add_reference alias :invert_remove_belongs_to :invert_remove_reference + def invert_change_column_default(args) + table, column, options = *args + + unless options && options.is_a?(Hash) && options.has_key?(:from) && options.has_key?(:to) + raise ActiveRecord::IrreversibleMigration, "change_column_default is only reversible if given a :from and :to option." + end + + [:change_column_default, [table, column, from: options[:to], to: options[:from]]] + end + def invert_change_column_null(args) args[2] = !args[2] [:change_column_null, args] @@ -184,6 +215,16 @@ module ActiveRecord [:remove_foreign_key, [from_table, options]] end + def invert_remove_foreign_key(args) + from_table, to_table, remove_options = args + raise ActiveRecord::IrreversibleMigration, "remove_foreign_key is only reversible if given a second table" if to_table.nil? || to_table.is_a?(Hash) + + reversed_args = [from_table, to_table] + reversed_args << remove_options if remove_options + + [:add_foreign_key, reversed_args] + end + # Forwards any missing method call to the \target. def method_missing(method, *args, &block) if @delegate.respond_to?(method) diff --git a/activerecord/lib/active_record/migration/compatibility.rb b/activerecord/lib/active_record/migration/compatibility.rb new file mode 100644 index 0000000000..1b94573870 --- /dev/null +++ b/activerecord/lib/active_record/migration/compatibility.rb @@ -0,0 +1,91 @@ +module ActiveRecord + class Migration + module Compatibility # :nodoc: all + V5_0 = Current + + module FourTwoShared + module TableDefinition + def timestamps(*, **options) + options[:null] = true if options[:null].nil? + super + end + end + + def create_table(table_name, options = {}) + if block_given? + super(table_name, options) do |t| + class << t + prepend TableDefinition + end + yield t + end + else + super + end + end + + def add_timestamps(*, **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.key?(:name).present? + options[:name].to_s + else + index_name(table_name, column: column_names) + end + super + end + + def remove_index(table_name, options = {}) + options = { column: options } unless options.is_a?(Hash) + options[:name] = index_name_for_remove(table_name, options) + super(table_name, options) + end + + private + + def index_name_for_remove(table_name, options = {}) + index_name = index_name(table_name, options) + + unless index_name_exists?(table_name, index_name, true) + if options.is_a?(Hash) && options.has_key?(:name) + options_without_column = options.dup + options_without_column.delete :column + index_name_without_column = index_name(table_name, options_without_column) + + return index_name_without_column if index_name_exists?(table_name, index_name_without_column, false) + end + + raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' does not exist" + end + + index_name + end + end + + class V4_2 < V5_0 + # 4.2 is defined as a module because it needs to be shared with + # Legacy. When the time comes, V5_0 should be defined straight + # in its class. + include FourTwoShared + end + + module Legacy + include FourTwoShared + + def run(*) + ActiveSupport::Deprecation.warn \ + "Directly inheriting from ActiveRecord::Migration is deprecated. " \ + "Please specify the Rails release the migration was written for:\n" \ + "\n" \ + " class #{self.class.name} < ActiveRecord::Migration[4.2]" + super + end + end + end + end +end |