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_index
-
add_timestamps
-
create_table
-
remove_timestamps
-
rename_column
-
rename_index
-
rename_table
Methods
Attributes
[RW] | commands | |
[RW] | delegate |
Class Public methods
Instance Public methods
Returns a list that represents commands that are the inverse of the
commands stored in commands
. For example:
recorder.record(:rename_table, [:old, :new]) recorder.inverse # => [:rename_table, [:new, :old]]
This method will raise an IrreversibleMigration
exception if
it cannot invert the commands
.