issue with factory_girl , rpsec 2.0 and rails 3.0 => can't get has_one relation working nicely together!

I'm running rails 3.0, rspec 2.0 and factory_girl. Here is the simplified scenario I'm working with: a user can subscribe to only one plan at a time

# user.rb
class User < ActiveRecord::Base
  has_one :plan
  attr_accessible :login, :plan_id

end

# plan.rb
class Profile < ActiveRecord::Base
 attr_accessible :plan
end

# user_factory.rb
Factory.define :user do |u|
  u.login "test"
  u.association :plan
end

#plan_factory.rb
Factory.define :plan do |p|
   p.name "plan1"
end

when I run rspec spec/models/user_spec.rb I got this error:

Failure/Error: user = Factory(:user) SQLite3::ConstraintException: users.plan_id may not be NULL

#spec/models/user_spec.rb
require File.dirname开发者_如何学Go(__FILE__) + '/../spec_helper'

describe User do
  it "should be valid" do
    user = Factory(:user)
    #User.new.should be_valid
    user.should be_valid
  end
end

what I'm doing wrong? I'm stuck with this very simple scenario, and it is very frustating. at that point BDD slow me down like hell!

It looks like you've implemented the has_one association incorrectly. The foreign key in a has_one -- belongs_to relationship should go in the table corresponding to the model with the belongs_to directive. Check db/schema.rb -- I think you'll find that plan_id is defined in the users table. If you want the User model to have one Plan, you'll need to remove plan_id from users and add user_id to plans.

If you'd rather make it so a Plan has one User, keep the schema as is and put has_one :user in Plan and belongs_to :plan in User.

A user subscribes to one plan. so a user has one plan and a plan is related to many users. So I think I got it right. the error was in the user factory. replacing

u.association :plan

by

u.association :plan, :factory => :plan

fixed the issue.

Problem solved!