Module: ActiveRecord::PGEnum::CommandRecorder

Defined in:: lib/active_record/pg_enum/command_recorder.rb

Overview

ActiveRecord::Migration::CommandRecorder is a class used by reversible migrations. It captures the forward migration commands and translates them into their inverse by way of some simple metaprogramming.

The Migrator class uses CommandRecorder during the reverse migration instead of the connection object. Forward migration calls are translated to their inverse where possible, and then forwarded to the connetion. Irreversible migrations raise an exception.

Known schema statement methods are metaprogrammed into an inverse method like so:

create_table => invert_create_table

which returns:

[:drop_table, args.first]

Instance Method Summary collapse

Instance Method Details

#add_enum_value(*args, &block) ⇒ `Object`



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# File 'lib/active_record/pg_enum/command_recorder.rb', line 28

def add_enum_value(*args, &block)
  record(:add_enum_value, args, &block)
end

#create_enum(*args, &block) ⇒ `Object`



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# File 'lib/active_record/pg_enum/command_recorder.rb', line 20

def create_enum(*args, &block)
  record(:create_enum, args, &block)
end

#drop_enum(*args, &block) ⇒ `Object`



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# File 'lib/active_record/pg_enum/command_recorder.rb', line 24

def drop_enum(*args, &block)
  record(:drop_enum, args, &block)
end