ruby-on-rails - 用 fixture 对多态关联进行单元测试

Question

我收到此错误消息:

ERROR["test_profile_display", UsersProfileTest, 2.569931] test_profile_display#UsersProfileTest (2.57s)
NoMethodError:         NoMethodError: undefined method `posts' for nil:NilClass
        app/controllers/users_controller.rb:14:in `show'
        test/integration/users_profile_test.rb:22:in `block in <class:UsersProfileTest>'
    app/controllers/users_controller.rb:14:in `show'
    test/integration/users_profile_test.rb:22:in `block in <class:UsersProfileTest>'

在 character行的UsersController中， @posts = @user.character.posts.paginate(page: params[:page])似乎为nil。用户和角色之间存在多态关系。我以为我在灯具中使用了正确的语法来告诉Rails用户Bazley有灯具:
在character.yml中:

character_bazley:
  sociable: bazley (user)

我如何说服Rails用户装置确实具有属于它的字符？

测试/集成/users_profile_test.rb:

require 'test_helper'

class UsersProfileTest < ActionDispatch::IntegrationTest
  include ApplicationHelper

  def setup
    @user = users(:bazley)
  end

  test "profile display" do
    log_in_as(@user)
    get user_path(@user)
    assert_template 'users/show'
    assert_select 'title', full_title(@user.name)
    assert_select 'h1', text: @user.name
    assert_select 'h1>img.gravatar'
    assert_match @user.character.posts.count.to_s, response.body
    assert_select 'div.pagination'
    @user.character.posts.paginate(page: 1).each do |post|
      assert_match post.content, response.body
    end
  end
end # UsersProfileTest

user.rb:

class User < ActiveRecord::Base

  attr_accessor :remember_token, :activation_token, :reset_token
  has_one  :character, as: :sociable, dependent: :destroy
  .
  .
end

character.rb:

class Character < ActiveRecord::Base

  belongs_to :sociable, polymorphic: true
  has_many   :posts, dependent: :destroy
  validates  :sociable_id, presence: true
end # Character

users.yml:

bazley:
  name: Bazley
  email: bazley@oxdorf.com
  callsign: bazley
  password_digest: <%= User.digest('password') %>
  admin: true
  activated: true
  activated_at: <%= Time.zone.now %>

character.yml:

character_bazley:
  sociable: bazley (user)

在UsersController中:

def show
  @user = User.find_by_callsign(params[:callsign])
  @posts = @user.character.posts.paginate(page: params[:page]) # the line causing the error
  @page_name = "user_page"
  redirect_to root_url and return unless @user.activated
end

Answer 1

将characters.yml更改为

character_bazley:
  sociable: bazley (User)

代替

character_bazley:
  sociable: bazley (user)

请注意，它是 User而不是 user。此处 User使用的关键字将告诉您 sociable_type是 User类。

引用:

http://ruby-journal.com/rails/define-fixtures-with-polymorphic-association/
http://api.rubyonrails.org/v3.2.8/classes/ActiveRecord/Fixtures.html#label-Polymorphic+belongs_to