在3.2到4的导轨上传文件时遇到问题 [英] Trouble with uploading file after upgrating rails from 3.2 to 4

问题描述

在我的画廊上传文件与Rails 3一起工作良好，但在提高后，我得到了这一行的exeption 错误的参数类型ActionDispatch :: Http :: UploadedFile（expected String） @ reel.update_attributes（reels_params）。
我不使用任何gem来处理文件上传，因为我需要特定的处理并将我的文件存储在数据库中。在升级到rails 4之后，我只添加了一个方法来处理控制器 reels_params 中的强参数。

控制器：

  class Admin :: ReelsController< AdminController 
 before_action：set_reel，only：[：show，：edit，：update，：destroy] 
 def update 
 respond_to do | format | 
 if @ reel.update_attributes（reels_params）
 format.html {redirect_to admin_reel_path（@reel），notice：t（'helpers.messages.update_success'）} 
 else 
 format .html {render action：edit} 
 end 
 end 
 end 
 ... 
 private 
 def set_reel 
 @reel = Reel.find（params [：id]）
 end 
 def reels_params 
 params.require（：reel）.permit！ 
 end 
 end 
  

查看：

  = form_for [：admin，@reel]，：html => {：class => 'form-horizo​​ntal form-admin'，：multipart => true} do | f | 
 .form-group 
 = f.label'Gallery'，：class => 'control-label col-sm-2'
 .col-sm-10 
  -  item.images.each do | img | 
 = f.fields_for：images，img do | img_f | 
 = img_f.text_field：title 
 = img_f.file_field：data，class：'img_upload'
  

如何纠正我的代码？

解决方案

为了解决这个问题，单个图像元素

pre $ <％= form_tag（{action：：update}，multipart：true，method：patch ）do％>
<％= file_field_tag'图片'％>

< div class =actions>
<％= submit_tag％>
< / div>

<％end％>


与控制器：

  def update 
 @ user.image = params [：image]<< ------在这一行失败
 respond_to do | format | 
 if @ user.save .... 
  

错误是：
错误的参数类型ActionDispatch :: Http :: UploadedFile（expected String）

在这里：
http://api.rubyonrails.org/classes/ActionDispatch/Http/UploadedFile.html
...我们找到.read选项，所以我修改了控制器：

  def update 
 @ user.image = params [：image] .read<< ------在这里添加后缀
 respond_to do | format | 
 if @ user.save ... 
  

它可以工作，我可以读取图像从文件返回OK。因此，看起来我们需要单独隔离和保存blob，添加.read后缀，并且不能将其保存在具有其他参数的组中，直到此BUG /（功能）被修复。

Uploading files in my gallery worked fine with Rails 3, but after upgrate I get exeption wrong argument type ActionDispatch::Http::UploadedFile (expected String) in this line @reel.update_attributes(reels_params). I don't use any gem for handle file uploading, because I need specific processing and store my files in db. After upgraded to rails 4, I added only 1 method to working with strong params in controller reels_params.

Controller:

class Admin::ReelsController < AdminController
  before_action :set_reel, only: [:show, :edit, :update, :destroy]
  def update
    respond_to do |format|
      if @reel.update_attributes(reels_params)
        format.html { redirect_to admin_reel_path(@reel), notice: t('helpers.messages.update_success') }
      else
        format.html { render action: "edit" }
      end
    end
  end
  ...
  private
    def set_reel
      @reel = Reel.find(params[:id])
    end
    def reels_params
      params.require(:reel).permit!
    end
end

View:

= form_for [:admin, @reel], :html => { :class => 'form-horizontal form-admin', :multipart => true } do |f|
  .form-group
    = f.label 'Gallery', :class => 'control-label col-sm-2'
    .col-sm-10
      - item.images.each do |img|
        = f.fields_for :images, img do |img_f|
          = img_f.text_field :title
          = img_f.file_field :data, class: 'img_upload'

How to correct my code?

解决方案

To break down this problem, I took the view down to only the single image-element

<%= form_tag({action: :update}, multipart: true,  method: "patch") do %>
    <%= file_field_tag 'image' %>

    <div class="actions">
      <%= submit_tag %>
    </div>

<% end %>

with controller:

def update
  @user.image = params[:image]  <<------Fails on this line
  respond_to do |format|
  if @user.save ....

The Error is: "wrong argument type ActionDispatch::Http::UploadedFile (expected String)"

Looking here: http://api.rubyonrails.org/classes/ActionDispatch/Http/UploadedFile.html ... we find the ".read" option, so I modified the controller to read:

def update
  @user.image = params[:image].read  <<------added the suffix here
  respond_to do |format|
  if @user.save ... 

It works, and I can read the image back from the file OK. So, it appears we will need to isolate and save blobs separately, adding the ".read" suffix, and cannot save it in a group with other params until this BUG/(feature) is fixed.

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