Question

我不断收到这个奇怪的错误，即使一切都在localhost上运行。

  1) User pages profile page 
     Failure/Error: before { visit user_path(user) }
     ActionView::Template::Error:
       undefined method `model_name' for NilClass:Class
     # ./app/views/shared/_create_list.html.erb:2:in `_app_views_shared__create_list_html_erb__3760252191913263716_70266394394440'
     # ./app/views/users/show.html.erb:17:in `_app_views_users_show_html_erb__4038196524711190952_70266368588040'
     # ./spec/requests/user_pages_spec.rb:12:in `block (3 levels) in <top (required)>'

users_controller

class UsersController < ApplicationController
  before_filter :signed_in_user, only: [:edit, :update]
  before_filter :correct_user,   only: [:edit, :update]

  def show
    @user = User.find(params[:id])
    @lists = @user.lists
    @list = current_user.lists.build if signed_in?
  end

lists_controller

class ListsController < ApplicationController
  before_filter :signed_in_user

  def create
    @list = current_user.lists.build(params[:list])
    if @list.save
      flash[:success] = "List created!"
      redirect_to current_user
    else
      redirect_to current_user
    end
  end

_create_list partial

<div class="white-box">
<%= form_for(@list) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_field :name, placeholder: "Create new list..." %>
    <%= f.submit "Create list", class: "btn btn-primary" %>
  </div>
<% end %>
</div>

用户/显示

  <div class="span8">
    <% if @user.lists.any? %>
      <h3>Lists (<%= @user.lists.count %>)</h3>
      <ol class="lists">
        <%= render @lists %>
      </ol>
    <% end %>
    <%= render 'shared/create_list' %>
  </div>

user_pages_spec

require 'spec_helper'

describe "User pages" do

  subject { page }

  describe "profile page" do
    let(:user) { FactoryGirl.create(:user) }
    let!(:m1) { FactoryGirl.create(:list, user: user, name: "Foo") }
    let!(:m2) { FactoryGirl.create(:list, user: user, name: "Bar") }

    before { visit user_path(user) }

我对rails很新，这个错误一直困扰着我好几天！任何建议都非常感谢！

Answer 1

此问题是因为如果用户登录，则将对象分配给@list，否则它将仅为零。

要解决此问题，请在（if @list）

中添加条件users/show

<%= render 'shared/create_list' if @list %>

未定义的方法`model_name'错误

1 个答案: