如何使用has_and_belongs_to_many关联获取FactoryGirl模型属性？

Question

我试图让FactoryGirl.attributes_for(:trip)与HABTM协会:countries因为控制器测试失败 - :countries缺席在: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的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 

旅行型号：

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) 

尝试这样：http://makandracards.com/jan0sch/11111-rails-factorygirl-and-has_and_belongs_to_many，但没用。

Answer 1

下面是解释了答案：

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 

FactoryGirl.attributes_for(:trip)回报

{ 
    :description=>"Eum alias tenetur odit voluptatibus inventore qui nobis.", 
    :end_date=>Wed, 16 Sep 2015 11:48:28 +0300 
} 

。

FactoryGirl.define do 
    factory :trip do 
    description { Faker::Lorem.sentence } 
    end_date { DateTime.now + 1.day } 
    country_ids { [FactoryGirl.create(:country, :with_currencies).id] } 
    end 
end 

FactoryGirl.attributes_for(:trip)回报

{ 
    :description=>"Assumenda sapiente pariatur facilis et architecto in.", 
    :end_date=>Wed, 16 Sep 2015 11:45:22 +0300, 
    :country_ids=>[4] 
} 

Answer 2

检查您是否确实在您的请求中发送任何countries_ids。

请更新您的帖子，其值为attributes_for(:trip)。