Rails 文件上传与/ Paperclip 和多态关联

Question

我正在开发一个 rails 应用程序，其中包含位置、健身房、用户和图像。所有这些共享图像，所以我没有按模型单独上传图像，而是喜欢 here 表达的解决方案并想重新创建它。

现在我的模型是这样的

class Picture < ActiveRecord::Base
  belongs_to :imageable, polymorphic: true
  has_attached_file :image, style: { small: '64x64', medium: '100x100', large: '200x200' }
  validates_attachment :image, presence: true, content_type: { content_type: /\Aimage\/.*\Z/ }, 
                                                size: { in: 0..5.megabytes }
end

class Location < ActiveRecord::Base
  geocoded_by :county_name
  after_validation :geocode

  has_many :pictures, as: :imageable
  accepts_nested_attributes_for :pictures #added, not sure if needed or not
end

这是位置控制器。我对控制器最关心的是我是否正在处理嵌套参数

class Admin::LocationsController < ApplicationController
  before_action :authorize_admin!

  def new
    @location = Location.new
    @location.pictures.build
  end

  def create
    @location = Location.new(location_params)
    if @location.save
      flash[:success] = 'Location created!'
      redirect_to admin_location_path(@location)
    else
      render 'new'
    end
  end
  ...
  private
  def location_params
    params.require(:location).permit(:county_name, :description,
                                picture_attributes: [:location_id, :id, :image] )
  end
end

和我的观点

<section class="new-product">
  <div class="container">
    <div class="row white_panel">
      <div class="col-lg-12">
                <h2 class="text-center">Add New Location</h2>
                <hr>
                <%= form_for([:admin, Location.new], html: { multipart: true, class: 'form-horizontal' }) do |f| %>
                  <%= render 'shared/error_messages', object: f.object %>
                  <div class="form-group">
                      <%= f.label :county_name %><br>
                      <%= f.text_field :county_name, class: 'form-control' %><br>
                    </div>
                    <div class="form-group">  
                      <%= f.label :description %><br>
                      <%= f.text_area :description, class: 'form-control' %><br>
                    </div>
                  <p>Upload Picture</p>
                  <%= f.fields_for :picture, Picture.new do |image_upload| %> 
                    <%= image_upload.file_field :image, style: 'padding-bottom: 25px;' %>
                  <% end %>
                  <%= f.submit 'Go!', class: 'btn btn-gen np' %>
                <% end %> 
            </div>  
        </div>  
    </div>  
</section>

现在，我没有收到任何错误。位置做得很好，但图片没有任何变化table。它只是返回零。

有人看到我做错了什么吗？我已经看到了一些关于如何执行此操作的资源，但它似乎通常适用于旧版本。

如果它对我正在使用的任何人有帮助
rails 4.2.6
ruby 2.2.2p95
paperclip 4.3.6

任何有关如何处理这些关系的帮助都将不胜感激:)

Answer 1

多亏了this

，我才能够解决这个问题

查看

<%= form_for([:admin, Location.new], html: { multipart: true, class: 'form-horizontal' }) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
    <div class="form-group">
      <%= f.label :county_name %><br>
      <%= f.text_field :county_name, class: 'form-control' %><br>
    </div>
    <div class="form-group">  
      <%= f.label :description %><br>
      <%= f.text_area :description, class: 'form-control' %><br>
    </div>
    <p>Upload Pictures</p>
      <%= file_field_tag "images[]", type: :file, multiple: true, style: 'padding-bottom: 25px;' %>
    <%= f.submit 'Go!', class: 'btn btn-gen np' %>
 <% end %>

控制器

class Admin::LocationsController < ApplicationController
  before_filter :authenticate_admin!

  def new
    @location = Location.new
    @location.pictures.build # I don't know if this is necessary or not
  end

  def create
    @location = Location.new(location_params)
    if @location.save
      # images 
      if params[:images]
        params[:images].each do |image|
          @location.pictures.create(image: image, imageable_id: @location.id)
        end
      end
      flash[:success] = 'Location created!'
      redirect_to admin_location_path(@location)
    else
      render 'new'
    end
  end
  ...
  private
  def location_params
    # took out the other attr's
    params.require(:location).permit(:county_name, :description)
  end
end

现在我可以做
Picture.find(1).image.url 或 @locations.pictures.first.image.url 一切正常:)

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