Ruby on Rails錯誤 - 狀態中的NoMethodError＃new

Question

我收到此錯誤狀態＃中的NoMethodError＃new當我在添加表單域後嘗試在我的應用程序中查看頁面時...我是ruby on new軌所以很希望能夠充分認識到這...

<%= f.input :user_id %> 

以下是完整的錯誤消息：

NoMethodError in Statuses#new 

Showing /Users/danlee/Projects/treebook/app/views/statuses/_form.html.erb where line #14 raised: 

undefined method `user_id' for #<Status:0x007feb53cdd138> 
Extracted source (around line #14): 

11:  </div> 
12: <% end %> 
13: 
14: <%= f.input :user_id %> 
15: <%= f.input :content %> 
16: <div class="form-actions"> 
17:  <%= f.button :submit %> 
Trace of template inclusion: app/views/statuses/new.html.erb 

Rails.root: /Users/danlee/Projects/treebook 

Application Trace | Framework Trace | Full Trace 
app/views/statuses/_form.html.erb:14:in `block in _app_views_statuses__form_html_erb__4012047659275744874_70324335923840' 
app/views/statuses/_form.html.erb:1:in `_app_views_statuses__form_html_erb__4012047659275744874_70324335923840' 
app/views/statuses/new.html.erb:3:in `_app_views_statuses_new_html_erb___64465850179705865_70324349236340' 
app/controllers/statuses_controller.rb:29:in `new' 
Request 

Parameters: 

None 
Show session dump 

Show env dump 

Response 

Headers: 

None 

Github上庫的應用程序也在這裏：https://github.com/pixeljugglerdan/treebook

Answer 1

看起來您並未將：user_id列添加到您的狀態中。該文件未在#change方法運行任何代碼：https://github.com/pixeljugglerdan/treebook/blob/master/db/migrate/20120911210237_add_user_id_to_statuses.rb

你可能想的東西，如重新運行遷移：

class AddUserIdToStatuses < ActiveRecord::Migration 
    def change 
    add_column :statuses, :user_id, :integer 
    end 
end