如何正确格式化 RSpec 更新测试

Question

我正在学习如何在 Rails 中测试控制器。我的帖子控制器中有此操作：

def update 
    @post = Post.new(post_params)
    if @post.save 
        redirect_to posts_path
        flash[:success] = "Your post has been updated"
    else 
        render 'edit'
    end 
end 

相当基本的更新操作。我想测试一下。这是我现在的测试：

需要'rails_helper'

RSpec.describe PostsController, type: :controller do 

 let!(:test_post) { Post.create(title: "testing", body: "testing") }

 describe "PUT update" do 
    context "when valid" do 
        it "updates post" do 
            patch :update, id: test_post, post: {title: 'other', body: 'other'}
            test_post.reload
            expect(test_post.title).to eq('other')
        end
    end 
 end 
end

此测试未通过。这是我从 RSpec 得到的错误：

1) PostsController PUT update when valid updates post
 Failure/Error: expect(test_post.title).to eq('other')

   expected: "other"
        got: "testing"

   (compared using ==)

我希望得到一些指导。谢谢！

Answer 1

在您的更新操作中，您正在创建一个新的Post，而不是更新现有的Post：

def update 
  @post = Post.new(post_params) <= here
  if @post.save 
    redirect_to posts_path
    flash[:success] = "Your post has been updated"
  else 
    render 'edit'
  end 
end 

您需要找到现有的Post 记录，然后对其进行更新。这可能看起来更像：

def update 
  @post = Post.find_by(id: params[:id]) <= might need to be different depending on how you have structured your params
  if @post.update_attributes(post_params)
    redirect_to posts_path
    flash[:success] = "Your post has been updated"
  else 
    render 'edit'
  end 
end