Working With Rails

Sexy Migrations

Sexy migrations.

class SexyRight < ActiveRecord::Migration def self.up create_table :users do string :name foreign_key :group # => makes group_id timestamps! # => created_at and updated_at end end end

def self.down
  drop_table :users
end

Pass :ref => true to a foreign_key declaration to make it a real foreign key constraint.

foreign_key :user, :ref => true  # makes fk constraint, references 'users' table

Also: foreign_keys, fkey, fkeys

Use polymorphic(name) to make polymorphicish id / type columns.

polymorphic :item # => makes item_id and item_type

Also: polymorphic!

The timestamps method accepts a list of symbols which it will create as datetime columns.

timestamps! :published_at  # => created published_at in addition to 
                           #    created_at and updated_at

Also: timestamps, auto_dates, auto_dates!

The inheritable method helps you out with STI, a bit.

inheritable!  # => t.column :type, :string

Also: inheritable

And then we’ve got locking:

locking! # => t.column :lock_version, :integer, :default => 0

Also: locking, locks!, locks.

Chris Wanstrath => chris[at]ozmm[dot]org

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