Question

这是我得到的错误：

Error:
ProjectsControllerTest#test_should_redirect_destroy_when_not_logged_in:
NoMethodError: undefined method `projects' for nil:NilClass
    app/controllers/projects_controller.rb:39:in `project_owner'
    test/controllers/projects_controller_test.rb:19:in `block (2 levels) in <class:ProjectsControllerTest>'
    test/controllers/projects_controller_test.rb:18:in `block in <class:ProjectsControllerTest>'

我认为发生的事情是正确的，如果我错了，那就是当代码进入并搜索项目时，它发现用户没有登录，因此没有这样的project_owner。即使这样，project_owner对象也应该选择它并检查它是否为零，但这可能不会发生。

Projects.Controller

class ProjectsController < ApplicationController
before_action :logged_in_user, only: [:index, :show, :create]
before_action :project_owner,  only: :destroy

def index
end

def show
    @project = Project.find(params[:id])
end

def new
    @project = Project.new
end

def create
    @project = current_user.projects.build(project_params)
    if @project.save
        flash[:success] = "Project Created"
        redirect_to @project
    else
      render 'new'
    end
end

def destroy
    @project.destroy
    flash[:success] = "Project Deleted"
    redirect_to request.referrer || root_url
  end

private

def project_params
    params.require(:project).permit(:name,:category,:picture)
end

def project_owner
  @project = current_user.projects.find_by(id: params[:id])
  redirect_to root_url if @project.nil?
end

end

项目模型

class Project < ApplicationRecord
  before_save {name.downcase!}
  belongs_to :user
  default_scope -> { order(created_at: :desc) }
  mount_uploader :picture, PictureUploader
  validates :user_id, presence: true
  validates :name && :category, presence: true
  validates :name, presence: true, 
                     uniqueness: { case_sensitive: false }

测试服

require 'test_helper'

class ProjectsControllerTest < ActionDispatch::IntegrationTest

   def setup
    @project = projects(:Flyingcar)
  end

  test "should redirect destroy when not logged in" do
    assert_no_difference 'Project.count' do
    delete project_path(@project)
    end
    assert_redirected_to login_url
  end

关于它可能是什么的任何想法？

谢谢！

Answer 1

此current_user错误是由project_owner方法中current_user的nil值引起的。

将此方法更改为

def project_owner
  if current_user.nil?
    redirect_to root_url
  else  
    @project = current_user.projects.find_by(id: params[:id])
    redirect_to root_url if @project.nil?
  end
end

Answer 2

在create和project_owner中都没有定义current_user，或者你在过滤器中是这样做的？然后你还必须为project_owner

这样做

NoMethodError：nil的未定义方法`projects'：NilClass

2 个答案: