Question

显示第3行引发的app / views / car / index.html：

当你没想到它时，你有一个零对象！您可能期望一个Array实例。评估nil.each时发生错误提取的来源（第3行）：

1：<h2>Current List of Cars</h2>

2：<dl>

3：<% @cars.each do |car| %>

4：<dt><%= car.name %></dt>

5：<dd>

6：<%= car.description %><br />

car_controller.rb：

class CarController < ApplicationController
  def add
      @title = "Add a New Car"

    if request.post?
      @car = Car.new(params[:car])
      @car.user_id = User.logged_in(session).id
    if @car.save
        flash[:notice] = "Car #{@car.name} added!"
        redirect_to :controller => :car, :action => :index
      end
    end
    @cars = Car.find(:all)
  end

  def edit
  end

end

我不明白的问题是什么

新错误

Car＃index

中的SyntaxError

显示第20行引发的app / views / car / index.html.erb：

编译错误 C：/ Users / Jatinder / BitNami RubyStack项目/ mercedes_mod 2 / app / views / car / index.html.erb：20：语法错误，意外kENSURE，期待kEND C：/ Users / Jatinder / BitNami RubyStack projects / mercedes_mod 2 / app / views / car / index.html.erb：22：语法错误，意外$ end，期待kEND 提取的来源（第20行）：

17: </dl>
18: 
19: <p><%= link_to "Add a Car", :controller => :car, :action => :add %></p>

模板包含跟踪：app / views / car / index.html.erb

/views/car/index.html.erb

<h2>Current List of Cars</h2>
<dl>
<% @cars.each do |car| %>
  <dt><% @user.cars.each do |cars| unless @user.blank? %></dt>
  <dd>
    <%= car.description %><br />
    <%= link_to "Edit", 
          :controller => :car, 
          :action => :edit,
          :id => car.id %> |
    <%= link_to "Delete", 
          :controller => :car, 
          :action => :delete,
          :id => car.id %>
  </dd>
<% end %>
</dl>

<p><%= link_to "Add a Car", :controller => :car, :action => :add %></p>

这次我再回来添加车页时又出现了新的错误：

NoMethodError in Car#add

Showing app/views/car/add.html.erb where line #2 raised:

undefined method `errors' for #<Array:0x57841b0>
Extracted source (around line #2):

1: <h1>Add a New Car</h1>
2: <%= error_messages_for :car %>
3: <% form_for :car do |f| %>
4:   <p>
5:     <%= f.label :name %>:

Answer 1

您需要将@cars作业置于index行动中。

def index
  @cars = @user ? @user.cars : Car.all
end

Car＃index中的NoMethodError

1 个答案: