FactoryGirl Polymorphic Association

gistfile1.rb

class Alert < ActiveRecord::Base
  belongs_to :alertable, :polymorphic => true
end


class Region < ActiveRecord::Base
  has_many :alerts, :as => :alertable
end


FactoryGirl.define do
  Factory.define :alert do |alert|
    alert.alertable { |a| a.association(:region) }
  end
end

Thank you! I've been trying to find the solution to this all morning!

<3

Thanks ^__^

I believe the correct syntax in 4+ is now simply:

FactoryGirl.define do
  factory :alert do
    alertable { |a| a.association(:region) }
  end
end

@nozpheratu Your solution works perfectly, thanks.

<3

🎉

But what if you have multiple polymorphic relationships? (Sorry. New-ish to Rails and Factory Girl.)

class Tag < ApplicationRecord
  has_many :taggings
  has_many :taggable, through: :taggings
  has_many :plans, through: :taggings, source: 'Plan'
  has_many :drills, through: :taggings, source: 'Drill'
end

class Plan < ApplicationRecord
  has_many :taggings, as: :taggable
  has_many :tags, through: :taggings
  has_many :drill_plans
  has_many :drills, through: :drill_plans
end

class Drill < ApplicationRecord
  has_many :drill_plans
  has_many :plans, through: :drill_plans
  has_many :taggings, as: :taggable
  has_many :tags, through: :taggings
end

class Tagging < ApplicationRecord
  belongs_to :tag
  belongs_to :taggable, polymorphic: true
end

Awesome!

@mstashev For multiple polymorphic relationships, you refer this link:
http://markcharlesdesign.blogspot.jp/2013/06/factorygirl-with-polymorphic.html

There is the fix form factory_bot documents

Polymorphic associations can be handled with traits:

FactoryBot.define do
  factory :video
  factory :photo

  factory :comment do
    for_photo

    trait :for_video do
      association(:commentable, factory: :video)
    end

    trait :for_photo do
      association(:commentable, factory: :photo)
    end
  end
end

This allows us to do:

create(:comment)
create(:comment, :for_video)
create(:comment, :for_photo)