使用外键关联显示回形针图像

Question

我有两个模特。我想在我的 resources_game 模型中使用外键 (resource_id) 来显示图像。

这是我的Resource模特

class Resource < ActiveRecord::Base

has_many :resource_books
has_many :resource_games, :dependent => :destroy
belongs_to :resouce_type
has_attached_file :image, :styles => { :small => "100x120>"},
                  :url  => "/assets/games/images/:basename/:style/:basename.:extension",
                  :path =>":rails_root/public/assets/games/images/:basename/:style/:basename.:extension"
accepts_nested_attributes_for :resource_books, :resource_games

这是我的ResourceGame模特

class ResourceGame < ActiveRecord::Base

belongs_to :resource, :class_name => ResourceGame, :foreign_key => :resource_id
attr_accessor :add_resources

has_attached_file :image, :styles => { :small => "100x120>"},
                  :url  => "/assets/games/images/:basename/:style/:basename.:extension",
                  :path =>":rails_root/public/assets/games/images/:basename/:style/:basename.:extension"

accepts_nested_attributes_for :add_resource

如果图像存储在资源 table 中，我会像这样检索并填充 table：

在我的 Resources 控制器中：

@latest_resources = Resource.paginate(:page => params[:page],:order => "id DESC", :per_page => 10)

那么在我看来：

<% @latest_resources.each do |project| %>

   <tr>
     <td><%= image_tag project.image.url(:small)  %></td>
     <td><%= project.resouce_type_name %></td>
     <td><%= project.name %></td>
     <td><%= project.url %></td>
   </tr>
<% end %>

图像正在存储在resources_gametable中，所以我应该如何在我的视图中写入image_tag来检索它？

Answer 1

您需要使用 form_for 并构建嵌套表单。这是 instructions，查看它然后 ping 我。

@resource.resourcegames 是一个数组，因为你有一个 has_many 关系，所以当你使用 form_for 时，你可以有 1 个嵌套形式或许多嵌套形式。

我也引用 paperclip github page

Usage

The basics of Paperclip are quite simple: Declare that your model has an attachment with the has_attached_file method, and give it a name.

Paperclip will wrap up to four attributes (all prefixed with that attachment's name, so you can have multiple attachments per model if you wish) and give them a friendly front end. These attributes are:

<attachment>_file_name
<attachment>_file_size
<attachment>_content_type
<attachment>_updated_at

By default, only _file_name is required for Paperclip to operate. You'll need to add _content_type in case you want to use content type validation.

More information about the options passed to has_attached_file is available in the documentation of Paperclip::ClassMethods.

以下链接有几个指南

http://www.railscook.com/recipes/multiple-files-upload-with-nested-resource-using-paperclip-in-rails/

Rails + Paperclip - Update/Edit multiple images

https://github.com/thoughtbot/paperclip/issues/1734

https://groups.google.com/forum/#!topic/rubyonrails-talk/Waxw8D6seRc

https://sleekd.com/general/adding-multiple-images-to-a-rails-model-with-paperclip/

Answer 2

通过将 resource_games 模型添加到控制器中的数组，我找到了一个适合我的解决方案。

    @latest_resources = Resource.find(:all, :include => :resource_games)

并像这样在视图中调用：

<% @latest_resources.each do |project| %>      
  <tr>
  <% project.resource_games.each do |resourcegames| %>      

<td><%= image_tag resourcegames.image.url(:small)  %></td>
  <% end %>
<td><%= project.resouce_type_name %></td>

通过这种方式，我可以同时使用来自多个 table 的数据填充 table。

使用外键关联显示回形针图像

display a paperclip image using Foreign key association

ruby-on-rails

foreign-keys

paperclip

Usage