Never been to CodeSnippets before?

Snippets is a public source code repository. Easily build up your personal collection of code snippets, categorize them with tags / keywords, and share them with the world (or not, you can keep them private!)

2 total

On This Page:

  1. 1 Uninitialized constant error in Rails migration
  2. 2 Creating a table with migrations when using has_and_belongs_to_many

Uninitialized constant error in Rails migration

to rails migrations uninitialized constant by deckard on Apr 14, 2007
UPDATE:
This was because I had pluralized Tiers in its class definition, not because Rails was acting different. The below is not true, but it still is a good idea because if you change any models in the future, it will break subsequent migrations (which would likely happen anyways)

Now for some reason you have to define your models within your migration to get access to their functionality. It's not guaranteed that the migration will have automatic access to your models.

E.g.
class LoadTiersUsers < ActiveRecord::Migration
  extend MigrationHelpers

	class Tier < ActiveRecord::Base; has_and_belongs_to_many :users end
	class User < ActiveRecord::Base; has_and_belongs_to_many :tiers end
	class TiersUsers < ActiveRecord::Base; end
  def self.up
		p "*** Loading user, tier data..."

Creating a table with migrations when using has_and_belongs_to_many

to rails migrations database by UnLogikal on Feb 16, 2006
You can find the information at http://api.rubyonrails.org under the "create_table" method. The short answer is this though,

create_table :table_name, :id => false do |t|

end


:id is the part you're looking for, it defaults to true, which creates the :id as an autoincrementing primary key, if you use migrations and want to create the join table, you don't want an "id" column, so use :id => false to override the create_table method and tell it you don't want that primary key.
2 total

On This Page:

  1. 1 Uninitialized constant error in Rails migration
  2. 2 Creating a table with migrations when using has_and_belongs_to_many