关于 ruby?? on rails：如何通过 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 HABTM 关联 :countries 获取 FactoryGirl.attributes_for(:trip)，因为控制器测试失败 - :countries 在 :trip 属性中不存在)：

旅行控制器：

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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('').html_safe
end
end

def create_params
params.require(:trip).permit(:end_date, :description, country_ids: [], countries: [])
end
end

RSpec TripsController 测试：

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describe TripsController do
describe 'POST #create' do
before { post :create, trip: attributes_for(:trip) }
it { is_expected.to redirect_to trips_path }
end
end

旅行模式：

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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：

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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

ruby文件：

1	factory_girl_rails (4.5.0)

试过这个：http://makandracards.com/jan0sch/11111-rails-factorygirl-and-has_and_belongs_to_many，但没用。