Carrierwave、Rails 4 和多次上传 [英] Carrierwave, Rails 4, and Multiple Uploads

问题描述

我一直在努力让 Carrierwave、Rails 4 和 Multiple Uploads 一起工作.我可以像在这个项目和许多其他项目中一样正常上传单个文件.

I have been banging my head against the wall trying to get Carrierwave, Rails 4, and Multiple Uploads all working together. I can get a single file upload working just fine as in this and many other projects.

这不是一个嵌套的情况 - 只是简单地上传到一个名为 Transcription 的模型并希望为每个上传的文档创建一个记录.

This is not a nested situation - just simply uploading to a single model called Transcription and wanting to create a record for each document uploaded.

我似乎找不到正确的方法来声明用于载波安装的文档"字段

I cannot seem to find the correct way to declare the "document" field used for the carrierwave mount

mount_uploader :document, DocumentUploader

作为强参数识别的数组.

as an array for the strong parameters to recognize.

我尝试过白名单:whitelisted[:document] = params[:transcription]['document'],

将文档"声明为数组:

params.require(:transcription).permit(..... ,:document => [])

params.require(:transcription).permit(..... , { document: [] })

这一切看起来更像是我在为嵌套模型声明数组，但我真的希望 Rails 4 的强大参数能够简单地看到由 file_field 创建的文档"数组，:multiple => true

This all seems more like I am declaring the array for a nested model, but I really want Rails 4's strong parameters to simply see the "document" array created by the file_field, :multiple => true

即.来自日志:form-data；name="转录[文档][]

有没有人在 Rails 4 中使用强参数成功完成多次上传?如果有，请分享一下?

Has anybody successfully accomplished multiple uploads in Rails 4 with strong parameters? If so would you please share?

谢谢...

干杯，

比尔

推荐答案

这是使用 rails 4 中的载波从头开始上传多个图像的解决方案

只需按照以下步骤操作即可.

rails new multiple_image_upload_carrierwave

在 gem 文件中

gem 'carrierwave'
bundle install
rails generate uploader Avatar 

创建脚手架

rails g scaffold post title:string

创建 post_attachment 脚手架

rails g scaffold post_attachment post_id:integer avatar:string

rake db:migrate

在 post.rb 中

class Post < ActiveRecord::Base
   has_many :post_attachments
   accepts_nested_attributes_for :post_attachments
end

在 post_attachment.rb 中

class PostAttachment < ActiveRecord::Base
   mount_uploader :avatar, AvatarUploader
   belongs_to :post
end

在 post_controller.rb 中

def show
   @post_attachments = @post.post_attachments.all
end

def new
   @post = Post.new
   @post_attachment = @post.post_attachments.build
end

def create
   @post = Post.new(post_params)

   respond_to do |format|
     if @post.save
       params[:post_attachments]['avatar'].each do |a|
          @post_attachment = @post.post_attachments.create!(:avatar => a, :post_id => @post.id)
       end
       format.html { redirect_to @post, notice: 'Post was successfully created.' }
     else
       format.html { render action: 'new' }
     end
   end
 end

 def update
   respond_to do |format|
     if @post.update(post_params)
       params[:post_attachments]['avatar'].each do |a|
         @post_attachment = @post.post_attachments.create!(:avatar => a, :post_id => @post.id)
       end
     end
  end

  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to @post }
      format.json { head :no_content }
    end
  end


 private
   def post_params
      params.require(:post).permit(:title, post_attachments_attributes: [:id, :post_id, :avatar])
   end

在views/posts/_form.html.erb中

<%= form_for(@post, :html => { :multipart => true }) do |f| %>
   <div class="field">
     <%= f.label :title %><br>
     <%= f.text_field :title %>
   </div>

   <%= f.fields_for :post_attachments do |p| %>
     <div class="field">
       <%= p.label :avatar %><br>
       <%= p.file_field :avatar, :multiple => true, name: "post_attachments[avatar][]" %>
     </div>
   <% end %>

   <% if params[:controller] == "post" && params[:action] == "edit" %> 
     <% @post.post_attachments.each do |p| %>
       <%= image_tag p.avatar, :size => "150x150" %>
     <% end %>
   <% end %>

   <div class="actions">
     <%= f.submit %>
   </div>
<% end %>

在views/posts/show.html.erb中

<p id="notice"><%= notice %></p>

<p>
  <strong>Title:</strong>
  <%= @post.title %>
</p>

<% @post_attachments.each do |p| %>
  <%= image_tag p.avatar_url, :size => "150x150" %>
  <%= link_to "Destroy", p, method: :delete %>
<% end %>

<%= link_to 'Edit', edit_post_path(@post) %> |
<%= link_to 'Back', posts_path %>

在 rails 3 中无需定义强参数，您可以在模型中定义 attribute_accessible 并在模型中定义 accept_nested_attribute 来发布模型，因为在 rails 4 中不推荐使用属性可访问性.

In rails 3 no need to define strong parameters and as you can define attribute_accessible in both the model and accept_nested_attribute to post model because attribute accessible is deprecated in rails 4.

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