/ Ruby on Rails
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class

ActiveRecord::Migration::CommandRecorder

rails latest stable - Superclass: Object

Migration Command Recorder

+ActiveRecord::Migration::CommandRecorder+ records commands done during a migration and knows how to reverse those commands. The CommandRecorder knows how to invert the following commands:

  • add_column

  • add_foreign_key

  • add_check_constraint

  • add_exclusion_constraint

  • add_unique_constraint

  • add_index

  • add_reference

  • add_timestamps

  • change_column_default (must supply a :from and :to option)

  • change_column_null

  • change_column_comment (must supply a :from and :to option)

  • change_table_comment (must supply a :from and :to option)

  • create_enum

  • create_join_table

  • create_table

  • disable_extension

  • drop_enum (must supply a list of values)

  • drop_join_table

  • drop_table (must supply a block)

  • enable_extension

  • remove_column (must supply a type)

  • remove_columns (must supply a :type option)

  • remove_foreign_key (must supply a second table)

  • remove_check_constraint

  • remove_exclusion_constraint

  • remove_unique_constraint

  • remove_index

  • remove_reference

  • remove_timestamps

  • rename_column

  • rename_enum (must supply a :to option)

  • rename_enum_value (must supply a :from and :to option)

  • rename_index

  • rename_table

Included modules

  • ActiveRecord::Migration::CommandRecorder::StraightReversions
  • ActiveRecord::Migration::JoinTable

Constants

ReversibleAndIrreversibleMethods = [\n:create_table, :create_join_table, :rename_table, :add_column, :remove_column,\n:rename_index, :rename_column, :add_index, :remove_index, :add_timestamps, :remove_timestamps,\n:change_column_default, :add_reference, :remove_reference, :transaction,\n:drop_join_table, :drop_table, :execute_block, :enable_extension, :disable_extension,\n:change_column, :execute, :remove_columns, :change_column_null,\n:add_foreign_key, :remove_foreign_key,\n:change_column_comment, :change_table_comment,\n:add_check_constraint, :remove_check_constraint,\n:add_exclusion_constraint, :remove_exclusion_constraint,\n:add_unique_constraint, :remove_unique_constraint,\n:create_enum, :drop_enum, :rename_enum, :add_enum_value, :rename_enum_value,\n]

Attributes

[RW]commands
[RW]delegate
[RW]reverting

Files

  • activerecord/lib/active_record/migration/command_recorder.rb