diff options
9 files changed, 64 insertions, 7 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index d87e609956..794bb779fa 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,3 +1,15 @@ +* Add alternate syntax to make `change_column_default` reversible. + + User can pass in `:from` and `:to` to make `change_column_default` command + become reversible. + + Example: + + change_column_default :posts, :status, from: nil, to: "draft" + change_column_default :users, authorized, from: true, to: false + + *Prem Sichanugrist* + * Prevent error when using `force_reload: true` on an unassigned polymorphic belongs_to association. diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb index 158b773e11..d17e272ed1 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb @@ -592,10 +592,11 @@ module ActiveRecord # # t.change_default(:qualification, 'new') # t.change_default(:authorized, 1) + # t.change_default(:status, from: nil, to: "draft") # # See SchemaStatements#change_column_default - def change_default(column_name, default) - @base.change_column_default(name, column_name, default) + def change_default(column_name, default_or_changes) + @base.change_column_default(name, column_name, default_or_changes) end # Removes the column(s) from the table definition. diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb index 49ffd7ccf0..8bbd96e722 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb @@ -460,7 +460,12 @@ module ActiveRecord # # change_column_default(:users, :email, nil) # - def change_column_default(table_name, column_name, default) + # Passing a hash containing +:from+ and +:to+ will make this change + # reversible in migration: + # + # change_column_default(:posts, :state, from: nil, to: "draft") + # + def change_column_default(table_name, column_name, default_or_changes) raise NotImplementedError, "change_column_default is not implemented" end @@ -1068,6 +1073,14 @@ module ActiveRecord raise ArgumentError, "Index name '#{new_name}' on table '#{table_name}' is too long; the limit is #{allowed_index_name_length} characters" end end + + def extract_new_default_value(default_or_changes) + if default_or_changes.is_a?(Hash) && default_or_changes.has_key?(:from) && default_or_changes.has_key?(:to) + default_or_changes[:to] + else + default_or_changes + end + end end end end diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb index 00e3d2965b..2027492f29 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -629,7 +629,8 @@ module ActiveRecord end end - def change_column_default(table_name, column_name, default) #:nodoc: + def change_column_default(table_name, column_name, default_or_changes) #:nodoc: + default = extract_new_default_value(default_or_changes) column = column_for(table_name, column_name) change_column table_name, column_name, column.sql_type, :default => default end diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb index 595c635fc0..d114cad16b 100644 --- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb @@ -410,11 +410,12 @@ module ActiveRecord end # Changes the default value of a table column. - def change_column_default(table_name, column_name, default) # :nodoc: + def change_column_default(table_name, column_name, default_or_changes) # :nodoc: clear_cache! column = column_for(table_name, column_name) return unless column + default = extract_new_default_value(default_or_changes) alter_column_query = "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} %s" if default.nil? # <tt>DEFAULT NULL</tt> results in the same behavior as <tt>DROP DEFAULT</tt>. However, PostgreSQL will diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb index 87129c42cf..7c809b088c 100644 --- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb @@ -422,7 +422,9 @@ module ActiveRecord end end - def change_column_default(table_name, column_name, default) #:nodoc: + def change_column_default(table_name, column_name, default_or_changes) #:nodoc: + default = extract_new_default_value(default_or_changes) + alter_table(table_name) do |definition| definition[column_name].default = default end diff --git a/activerecord/lib/active_record/migration/command_recorder.rb b/activerecord/lib/active_record/migration/command_recorder.rb index b592c004aa..dcc2362397 100644 --- a/activerecord/lib/active_record/migration/command_recorder.rb +++ b/activerecord/lib/active_record/migration/command_recorder.rb @@ -72,7 +72,7 @@ module ActiveRecord [: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, + :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 @@ -166,6 +166,16 @@ module ActiveRecord 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] diff --git a/activerecord/test/cases/migration/columns_test.rb b/activerecord/test/cases/migration/columns_test.rb index 5fc7702dfa..ab3f584350 100644 --- a/activerecord/test/cases/migration/columns_test.rb +++ b/activerecord/test/cases/migration/columns_test.rb @@ -267,6 +267,13 @@ module ActiveRecord assert_nil TestModel.new.first_name end + def test_change_column_default_with_from_and_to + add_column "test_models", "first_name", :string + connection.change_column_default "test_models", "first_name", from: nil, to: "Tester" + + assert_equal "Tester", TestModel.new.first_name + end + def test_remove_column_no_second_parameter_raises_exception assert_raise(ArgumentError) { connection.remove_column("funny") } end diff --git a/activerecord/test/cases/migration/command_recorder_test.rb b/activerecord/test/cases/migration/command_recorder_test.rb index 90b7c6b38a..99f1dc65b0 100644 --- a/activerecord/test/cases/migration/command_recorder_test.rb +++ b/activerecord/test/cases/migration/command_recorder_test.rb @@ -169,6 +169,16 @@ module ActiveRecord end end + def test_invert_change_column_default_with_from_and_to + change = @recorder.inverse_of :change_column_default, [:table, :column, from: "old_value", to: "new_value"] + assert_equal [:change_column_default, [:table, :column, from: "new_value", to: "old_value"]], change + end + + def test_invert_change_column_default_with_from_and_to_with_boolean + change = @recorder.inverse_of :change_column_default, [:table, :column, from: true, to: false] + assert_equal [:change_column_default, [:table, :column, from: false, to: true]], change + end + def test_invert_change_column_null add = @recorder.inverse_of :change_column_null, [:table, :column, true] assert_equal [:change_column_null, [:table, :column, false]], add |