ActionController :: RoutingError（没有路线匹配[GET]“/images/medium/missing.png”）： [英] ActionController::RoutingError (No route matches [GET] "/images/medium/missing.png"):

问题描述

这个问题是 - 我认为 - 指向一个已删除的图像，但在应用程序中绝对没有图像称为缺少。

  ActionController :: RoutingError（没有路由匹配[GET]/images/medium/missing.png）：
 
前缀动词URI模式Controller＃Action 
 pins GET /pins(.:format）pins＃index 
 POST /pins(.:format）pins＃create 
 new_pin GET /pins/new(.:format）pins #new 
 edit_pin GET /pins/:id/edit(.:format）pins＃edit 
 pin GET /pins/:id(.:format）pins＃show 
 PATCH / pins / ：id（。：format）pins＃update 
 PUT /pins/:id(.:format）pins＃update 
 DELETE /pins/:id(.:format）pins＃destroy 
 new_user_session GET /users/sign_in(.:format）devise / sessions＃new 
 user_session POST /users/sign_in(.:format）devise / sessions＃create 
 destroy_user_session DELETE /users/sign_out(.:format） devise / sessions＃destroy 
 user_password POST /users/password(.:format）devise / passwords＃create 
 new_user_password GET /users/password/new(.:format）devise / passwords＃new 
 edit_user_password GET /users/password/edit(.:format）devise / passwords＃edit 
 PATCH /users/password(.:format）devise / passwords＃update 
 PUT / users / password（.:格式）devise / passwords＃update 
 cancel_user_registration GET /users/cancel(.:format）devise / registrations＃cancel 
 user_registration POST /users(.:format）devise / registrations＃create 
 new_user_registration GET /users/sign_up(.:format）设计/注册＃new 
 edit_user_r egistration GET /users/edit(.:format）devise / registrations＃edit 
 PATCH /users(.:format）devise / registrations＃update 
 PUT /users(.:format）devise / registrations＃update 
 DELETE /users(.:format）devise / registrations＃destroy 
 GET GET / pages＃home 
 GET /about(.:format）pages＃about 
  
 
解决方案
 
 
 
 。
 
 ...那就是问题所在！
 
 
 
您的应用正在寻找一张图片来显示，如果没有图像上传。
 
这是在您的模型中定义的，其中定义了附件（通过回形针或carrierwave）。
 
 
 
请参阅快速入门 回形针 
  class User< ActiveRecord :: Base 
 has_attached_file：头像，
：styles => {：medium => 300x300>，：thumb => 100×100> 中}，
：default_url => /images/:style/missing.png＃< =你看到了吗？ 
 end 
  
您需要放置名为的图片missing.png 为每个不同的风格（这里 medium 和 thumb ）在 app / assets / images /：style 文件夹中定义。这将由资产管道处理。 
如果您只想将缺失 -images上传到S3，则需要在那里定义一个存储桶，为每个定义的样式添加文件夹并通过像这样的绝对路径引用它们： 
 
 
 ：default_url => https://YOURBUCKET.amazons3.com/:style/missing.png
  
如果您上传所有用户上传的内容到S3，我推荐阅读 Paperclip :: Storage :: S3 。
 
This problem is - i think - pointing to a deleted image, but there is definitely no image called missing in the app.
ActionController::RoutingError (No route matches [GET] "/images/medium/missing.png"):

                  Prefix Verb   URI Pattern                    Controller#Action
                    pins GET    /pins(.:format)                pins#index
                         POST   /pins(.:format)                pins#create
                 new_pin GET    /pins/new(.:format)            pins#new
                edit_pin GET    /pins/:id/edit(.:format)       pins#edit
                     pin GET    /pins/:id(.:format)            pins#show
                         PATCH  /pins/:id(.:format)            pins#update
                         PUT    /pins/:id(.:format)            pins#update
                         DELETE /pins/:id(.:format)            pins#destroy
        new_user_session GET    /users/sign_in(.:format)       devise/sessions#new
            user_session POST   /users/sign_in(.:format)       devise/sessions#create
    destroy_user_session DELETE /users/sign_out(.:format)      devise/sessions#destroy
           user_password POST   /users/password(.:format)      devise/passwords#create
       new_user_password GET    /users/password/new(.:format)  devise/passwords#new
      edit_user_password GET    /users/password/edit(.:format) devise/passwords#edit
                         PATCH  /users/password(.:format)      devise/passwords#update
                         PUT    /users/password(.:format)      devise/passwords#update
cancel_user_registration GET    /users/cancel(.:format)        devise/registrations#cancel
       user_registration POST   /users(.:format)               devise/registrations#create
   new_user_registration GET    /users/sign_up(.:format)       devise/registrations#new
  edit_user_registration GET    /users/edit(.:format)          devise/registrations#edit
                         PATCH  /users(.:format)               devise/registrations#update
                         PUT    /users(.:format)               devise/registrations#update
                         DELETE /users(.:format)               devise/registrations#destroy
                    root GET    /                              pages#home
                   about GET    /about(.:format)               pages#about

解决方案

  
but there is definitely no image called missing in the app.
... and that is the problem!

Your app is looking for a picture to show, if no image has been uploaded.

This is defined in your model, where the attachment (via paperclip or carrierwave) is defined.

see the Quick Start of e.g. paperclip
class User < ActiveRecord::Base
  has_attached_file :avatar, 
    :styles => { :medium => "300x300>", :thumb => "100x100>" }, 
    :default_url => "/images/:style/missing.png" # <= you see ?
end
You need to place an image called missing.png for each different style (here medium and thumb) defined in your app/assets/images/:style folder(s). This will then be handled by the asset pipeline. 
If you only want to upload the missing-images to S3, you need to define a bucket there, add folders for each defined style and reference them via absolute path like this:
:default_url => "https://YOURBUCKET.amazons3.com/:style/missing.png"
If you upload all your user uploaded content to S3, i recommend reading the excellent documentation on Paperclip::Storage::S3.

                        
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