FactoryGirl: why does attributes_for omit some attributes?

Question

I want to use FactoryGirl.attributes_for in controller testing, as in:

it \"raise error creating a new PremiseGroup for this user\" do
  expect {
    post :c         


        

Answer 1

The accepted answer seems outdated as it did not work for me, after digging through the web & especially this Github issue, I present you:

A clean version for the most basic functionality for Rails 5+

This creates :belongs_to associations and adds their id (and type if :polymorphic) to the attributes. It also includes the code through FactoryBot::Syntax::Methods instead of an own module limited to controllers.

spec/support/factory_bot_macros.rb

module FactoryBot::Syntax::Methods
  def nested_attributes_for(*args)
    attributes = attributes_for(*args)
    klass = args.first.to_s.camelize.constantize

    klass.reflect_on_all_associations(:belongs_to).each do |r|
      association = FactoryBot.create(r.class_name.underscore)
      attributes["#{r.name}_id"] = association.id
      attributes["#{r.name}_type"] = association.class.name if r.options[:polymorphic]
    end

    attributes
  end
end

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this is an adapted version of jamesst20 on the github issue - kudos to him