Rails教程，第7章未定義的方法「model_name」

Question

我正在使用Michael Hartl教程。在第7章中我發現的問題，我顯示當我啓動服務器並運行

http://localhost:3000/signup 

我recive此消息：

NoMethodError in User#new 

Showing C:/rails_project/sample_app/app/views/user/new.html.erb where line #6 raised: 

undefined method `model_name' for NilClass:Class 

Extracted source (around line #6): 

3: 
4: <div class="row"> 
5: <div class="span6 offset3"> 
6:  <%= form_for(@user) do |f| %> 
7: 
8:  <%= f.label :name %> 
9:  <%= f.text_field :name %> 

Rails.root: C:/rails_project/sample_app 
Application Trace | Framework Trace | Full Trace 

app/views/user/new.html.erb:6:in `_app_views_user_new_html_erb___578921578_24443340' 

有任何想法？

Answer 1

@user可能未被實例化。檢查users_controller.rb在def new方法中，查找類似@user = User.new的東西。

Answer 2

只是做

@user = User.new 

當您正在使用的尚未