How to define factories for a has_many through association

I am new to testing and factory_girl, and I want to create factories using factory_girl for a has_many through association.

I have seen a lot of articles on the web, but couldn't see the best way to do it.

I have two models, Widget and Feature.

The associations are:

class Feature < ActiveRecord::Base
  has_many :widget_features
  has_many :widgets, :through => :widget_features
end

and

class Widget < ActiveRecord::Base
  has_many :widget_features
  has_many :features, :through => :widget_features
end

Till now, I have tried this:

1. In my widget_feature_spec.rb, I did this

require 'spec_helper'

describe WidgetFeature do

  context "- METHOD - method_name " do
    it "should do blah" do
      widget = Factory.create(:widget)
      10.times { |i| Factory.create(:feature, :widget_id => widget.id)}
      result = WidgetFeature.method_name(widget.id)
      # do all the checks and expectations now
    end
  end
end

and many factories are

Factory.define :feature do |f|
  f.name "Feature_name"
  f.description "Feature_description"
  f.association :widget
end

and

Factory.de开发者_如何学Gofine :widget do |f|
  f.sequence(:title) {|n| "Widget_title#{n}"}
end

But autotest fails, giving this error:

NoMethodError:undefined method `widget_id=' for #

Then, if I add

f.widget_id Factory.create(:widget).id

to my Feature factories, I get this error,

/factory_girl/factory.rb:334:in `factory_by_name': No such factory: widget (ArgumentError)

I don't know what to do. I believe I am not getting it right. What is the best way to create factories for such associations.

Should I create associations in WidgetFeature OR Wigdet and Feature ??

---

Try to change the line:

10.times { |i| Factory.create(:feature, :widget_id => widget.id)}

into

10.times { |i| Factory.create(:feature, :widget => widget)}