Rails FactoryGirl属于属于其他2个模型的模型

Question

I have 3 following models like this:

# model/timeline.rb
class Timeline
  belongs_to :series
  belongs_to :creator
end

def series_belongs_to_creator
  if creator_id
    creator = Creator.find_by id: creator_id
    related_series = creator.series.find_by id: series_id
    errors.add(:series_id, :not_found_series) unless related_series
  end
end

# model/creator.rb
class Creator
  has_many :timelines
  has_many :series, through: :contents
end

# model/series.rb
class Series
  has_many :timelines
  has_many :creators, through: :contents
end

This is not many to many relation, timelines table has two fields creator_id and series_id beside another fields. creator_id and series_id must be entered when create Timeline and i have a method series_belongs_to_creator to validates series_id must belong to creator_id to create successful. So how should I write factory for timeline model if using FactoryGirl. Im so confused about Unit test in Rails.

Answer 1

If you're using Rails 5, you have to keep in mind that belongs_to is no longer optional by default: https://blog.bigbinary.com/2016/02/15/rails-5-makes-belong-to-association-required-by-default.html

So creator_id will always need to be present unless you specify the relation is optional.

For the factories, you're going to end up with something like this (FactoryGirl was recently renamed to FactoryBot): http://www.rubydoc.info/gems/factory_bot/file/GETTING_STARTED.md#Associations

FactoryBot.define do
  factory :timeline do
    creator
    series
  end
end


FactoryBot.define do
  factory :creator do
    ...
  end
end


FactoryBot.define do
  factory :series do
    ...
  end
end