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_index

  • add_reference

  • add_timestamps

  • change_column

  • 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_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

Constants

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, :change_column_comment, :change_table_comment ]

Attributes

[RW] reverting
[RW] delegate
[RW] commands
Show files where this class is defined (1 file)
Register or log in to add new notes.