Rails core - Aug 2008 - Ticket for Review #765: Add :primary_key option to belongs_to association

Hi -

Several weeks ago ticket #292 added the ability to specify the primary  
key in a has_many relationship and use that field instead of the  
primary key.

 
http://rails.lighthouseapp.com/projects/8994/tickets/292-add-has_many-primary_key-option

This doesn''t exist for the belongs_to side of that relationship.   
Ticket 765 (hopefully) fixes this.

 
http://rails.lighthouseapp.com/projects/8994/tickets/765-primary_key-option-for-belongs_to#ticket-765-2

With this patch applied one can now do this:

..... schema ......

    create_table :states do |t|
      t.string :abbr
      t.string :name
    end

    create_table :cities do |t|
      t.string :state_abbr
      t.string :name
    end

..... models ......

class City < ActiveRecord::Base
  belongs_to :state, :primary_key => :abbr, :foreign_key => :state_abbr
end

class State < ActiveRecord::Base
  has_many :cities, :primary_key => :abbr, :foreign_key => :state_abbr
end

And assuming the tables are populated with the data you''d expect, you  
can use the association as normal.

 >> wa = State.find(1)
=> #<State id: 1, abbr: "WA", name: "Washington">
=> #<City id: 1, state_abbr: "WA", name: "Olympia">
 >> wa.cities.first.state
=> #<State id: 1, abbr: "WA", name: "Washington">

Thanks for taking a look!

-philip

--
Philip Hallstrom
philip@pjkh.com
360.480.1209
www.pjkh.com




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