如何使用has_and_belongs_to_many关联获取FactoryGirl模型属性？(How to get FactoryGirl model attributes with has_and_belongs_to_many association?)

 我正在尝试使用FactoryGirl.attributes_for(:trip)关联获取FactoryGirl.attributes_for(:trip) :countries因为控制器测试失败 - :countries缺少的:countries :trip属性）： 
 
 TripsController： 
 
class TripsController < ApplicationController
  def create
    trip = Trip.new(create_params)
    if trip.save
      redirect_to trips_path, notice: 'Trip successfully created.'
    else
      redirect_to :back, alert: trip.errors.full_messages.join('<br>').html_safe
    end
  end

  def create_params
    params.require(:trip).permit(:end_date, :description, country_ids: [], countries: [])
  end
end
 
 RSpec TripsController测试： 
 
describe TripsController do
  describe 'POST #create' do
    before { post :create, trip: attributes_for(:trip) }
    it { is_expected.to redirect_to trips_path }
  end
end
 
 旅行模型： 
 
class Trip < ActiveRecord::Base
  # Associations
  has_and_belongs_to_many :countries

  #Validations
  validate :require_at_least_one_country

  private

  def require_at_least_one_country
    if country_ids.empty? && countries.count == 0
      errors.add(:base, 'Please select at least one country')
    end
  end
end
 
 旅行工厂： 
 
FactoryGirl.define do
  factory :trip do
    description  { Faker::Lorem.sentence }
    end_date  { DateTime.now + 1.day }

    after(:build) do |trip, evaluator|
      trip.countries << FactoryGirl.create(:country, :with_currencies)
    end
  end
end
 
 的Gemfile： 
 
factory_girl_rails (4.5.0)
 
 试过这个： http ： //makandracards.com/jan0sch/11111-rails-factory-and-has_and_belongs_to_many ，但没用。 

I'm trying to get FactoryGirl.attributes_for(:trip) with HABTM association :countries because controller test fails - :countries absent in :trip attributes):
 
TripsController:
 
class TripsController < ApplicationController
  def create
    trip = Trip.new(create_params)
    if trip.save
      redirect_to trips_path, notice: 'Trip successfully created.'
    else
      redirect_to :back, alert: trip.errors.full_messages.join('<br>').html_safe
    end
  end

  def create_params
    params.require(:trip).permit(:end_date, :description, country_ids: [], countries: [])
  end
end
 
RSpec TripsController test:
 
describe TripsController do
  describe 'POST #create' do
    before { post :create, trip: attributes_for(:trip) }
    it { is_expected.to redirect_to trips_path }
  end
end
 
Trip model:
 
class Trip < ActiveRecord::Base
  # Associations
  has_and_belongs_to_many :countries

  #Validations
  validate :require_at_least_one_country

  private

  def require_at_least_one_country
    if country_ids.empty? && countries.count == 0
      errors.add(:base, 'Please select at least one country')
    end
  end
end
 
Trip factory:
 
FactoryGirl.define do
  factory :trip do
    description  { Faker::Lorem.sentence }
    end_date  { DateTime.now + 1.day }

    after(:build) do |trip, evaluator|
      trip.countries << FactoryGirl.create(:country, :with_currencies)
    end
  end
end
 
Gemfile:
 
factory_girl_rails (4.5.0)
 
Tried this: http://makandracards.com/jan0sch/11111-rails-factorygirl-and-has_and_belongs_to_many, but useless.

原文：https://stackoverflow.com/questions/32558059