RSpec集成测试fill_in报错：无法找到可用的post[date]字段

问题描述 #

使用RSpec进行集成测试时，调用fill_in "post[date]"触发错误：

Unable to find field "post[date]" that is not disabled

以下是相关代码：

测试代码 #

require 'rails_helper'

describe 'navigate' do

  describe "index" do
    before do
      @user = User.create(email:"test@test.com", password:"test123", password_confirmation:"test123", first_name:"Umair", last_name:"Ahmed")
      
    end

    it "can be reached successfully" do
        visit posts_path
        expect(page.status_code).to eq(200)      
    end

  end

  describe "new and create" do
    before do
      user = User.create(email:"test@test.com", password:"test123", password_confirmation:"test123", first_name:"Umair", last_name:"Ahmed")
      login_as(user, scope: user) # 此处存在错误
      visit new_post_path
    end

    it "has a new form" do
      expect(page.status_code).to eq(200)
    end

    it "will fill in details of form" do
      fill_in "post[date]", with: Date.today
      fill_in "post[rationale]",    with: "something rationale"  

      click_on "Save"

      expect(page).to have_content("something rationale") 
    end

    it "will have a user associated with it" do
      fill_in "post[date]", with: Date.today
      fill_in "post[rationale]",    with: "User Association"  

      click_on "Save"
      expect(User.first.posts.first.rationale).to eq("User Association")  
      
    end
    
    
  end
  

end

Post模型代码（post.rb） #

class Post < ApplicationRecord
    belongs_to :user, optional: true
    validates_presence_of :date, :rationale
end

视图代码（views/posts/new.html.erb） #

<%= form_for @post do |f| %>
    <%= f.date_field :date %>
    <%= f.text_area :rationale %>

    <%= f.submit "Save" %>
<% end %>

解决方案 #

1. 修正login_as的scope参数 #

login_as方法的scope参数需传入符号类型的模型名（如:user），而非用户实例。错误的scope会导致登录失败，页面被重定向到登录页，自然找不到表单字段。

修正后的before块代码：

before do
  user = User.create(email:"test@test.com", password:"test123", password_confirmation:"test123", first_name:"Umair", last_name:"Ahmed")
  login_as(user, scope: :user) # 修正为:user
  visit new_post_path
end

2. 确认控制器初始化@post #

确保PostsController的new方法中初始化了@post，否则form_for无法正确生成表单字段：

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  before_action :authenticate_user!, only: [:new, :create]

  def new
    @post = Post.new # 必须初始化@post
  end

  # ...其他方法
end

3. 验证页面是否正确加载 #

如果问题仍存在，可在测试中添加puts page.html查看当前页面内容，确认是否成功跳转到新建文章页面，而非登录或其他页面。

验证修正后的测试 #

修正上述问题后，重新运行测试，fill_in方法应该能正常找到post[date]字段，完成表单填充及后续断言。

内容的提问来源于stack exchange，提问作者uma