Question

我有一个rails应用程序，我试图使用nested_attributes上传多个图像，但遇到了很大困难。这些图片似乎没有储存给mongodb。我已经按照本教程（尽管似乎缺乏详细信息）：http://initializd.com/blog/2013/3/upload-multiple-files-with-html5-rails-mongoid-paperclip-and-google-cloud-storage

基本上，我有一个表单，用户可以提交多个列表（作为嵌套属性），并且在每个列表下，他们可以提交多个图像（也作为嵌套属性）。

这是我的表单：

重要的部分是file_field_tag，用户应该上传多个图像。

<%= nested_form_for @user, url: wizard_path, :html => { :multipart => true } do |f| %>

                <h1 style="margin-bottom: 6%;"> Add Listings </h1>

                <!-- nested fields -->
                <%= f.fields_for :listings do |builder| %>

                    <div class="field form-group">
                        <%= builder.label :type %> <br />
                        <%= builder.select :type, options_for_select(listing_types), {}, { :class => 'form-control', :required => 'true' } %>
                    </div>

                    <div class="field form-group">
                        <%= builder.label :title %> <br />
                        <%= builder.text_field :title, class: 'form-control', required: 'true' %> <br />
                    </div>

                    <div class="field form-group">
                        <%= builder.label :description %> <br />
                        <%= builder.text_area :description, class: 'form-control', required: 'true' %>
                    </div>

                    <div class="field form-group">
                        <%= builder.label :url %> <br />
                        <%= builder.text_field :url, class: 'form-control', required: 'true' %>
                    </div>

                    <div class="field form-group">
                        <%= builder.label :zipcode %> <br />
                        <%= builder.text_field :zipcode, class: 'form-control', size: '24x4', required: 'true' %>
                    </div>

                    <div class="field form-group">
                        <%= label_tag "upload images" %> <br />
                        <%= file_field_tag('listing_images_attributes_file', multiple: true, name: "user[listings_attributes][images_attributes][][image]", :required => 'true') %>
                    </div>

                    <div class="field form-group">
                        <%= builder.link_to_remove "Remove this listing", :onclick =>"myFunction(this)" %>
                        <hr style="height: 2px; background-color: lightgray;">
                    </div>
                <% end %>


                <p style="margin-bottom: 15px;"><%= f.link_to_add "Add a listing", :listings %></p>


                <div class="actions">
                    <%= f.submit "Continue", class: "btn btn-lg btn-primary" %>
                </div>
            <% end %>

以下是我的模特：

清单模型：

class Listing
  include Mongoid::Document
  include Mongoid::Timestamps

  field :title, type: String
  field :type, type: String
  field :description, type: String
  field :url, type: String
  field :zipcode, type: String

  # association between listing and user
  embedded_in :user

  # each listing has many images
  embeds_many :images, :cascade_callbacks => true

  accepts_nested_attributes_for :images, :allow_destroy => true
end

图片模型：

class Image
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::Paperclip

  field :listing_id, type: Integer # what is the purpose of this field exactly?

  embedded_in :listing
  has_mongoid_attached_file :image,
    :path => ":rails_root/public/images/:id/:filename",
    :url  => "/images/:id/:filename"
end

来自用户控制器更新操作的片段（基本上是我的创建）：

def update
    @user = current_user
    #have to include steps to validate zip code
    case step
    when :personal
      @user.update_attributes(user_params)
    when :listings
      # should I build a listing as a default input?
      # listing = @user.listings.build
      @user.update_attributes(user_params)

    end

    render_wizard @user
  end

  def user_params
    params.require(:user).permit(:first_name, :last_name, :zipcode, :bio, listings_attributes: [:title, :type, :description, :url, :zipcode, 
      { images_attributes: [:image] }, :_destroy, :id])
  end

基本上我试图让用户能够上传多个列表，然后在每个列表下面显示多个图像。我想知道这是否可以使用nested_attributes或我是否必须手动处理params？还想知道我的强力参数是否设置正确。这是我的服务器日志中的一个片段，用于显示我的参数的样子：

Parameters: {"utf8"=>"✓", "authenticity_token"=>"HUpgUfukx3Rqb2Ye3su1/9ts4byC1BFrB3HOLXgQeJr8Vrcf9JyQYvR52FC5psLPZGD2x2DlzmlQRRgEXQWo2g==", "user"=>{"listings_attributes"=>{"0"=>{"type"=>"Airbnb", "title"=>"test", "description"=>"test", "url"=>"test", "zipcode"=>"test", "_destroy"=>"false", "id"=>"57a2b9ba9cd25d2d94110543"}}}, "listing"=>{"images_attributes"=>[{"image"=>#<ActionDispatch::Http::UploadedFile:0x000001016c2b20 @tempfile=#<Tempfile:/var/folders/vp/4hffkvd52gd317mgfqczqspm0000gn/T/RackMultipart20160804-11668-1fjlflq.jpg>, @original_filename="event1.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"listing[images_attributes][][image]\"; filename=\"event1.jpg\"\r\nContent-Type: image/jpeg\r\n">}]}, "commit"=>"Continue", "id"=>"listings"}

对于长篇描述感到抱歉，但我真的希望有人能回答这个问题。非常感谢你！

如何使用mongoid-paperclip通过嵌套模型上传多个图像？

0 个答案: