Ruby on Rails的：创建删除链接关联对象

Question

收到此错误：

undefined method `to_model' for #<Paperclip::Attachment:0x007fc5d1c46e60> 

我试图创建一个删除链接到我的相关图像

<% @project.project_images.each do |image| %> 
    <%= image_tag image.photo.url(:thumb) %> 
    <div class="actions"> 
    <%= link_to "remove", image.photo, confirm: "Are you sure?", method: :delete %> 
<% end %> 

我的模型

class Project < ActiveRecord::Base 
    has_many :project_images, dependent: :destroy 
    accepts_nested_attributes_for :project_images, allow_destroy: true 
end 

class ProjectImage < ActiveRecord::Base 
    belongs_to :project 
end 

我相信我的image.photo是错的，但我不确定它应该是什么？我想我应该确定路径是什么？但是我没有ProjectImages的路线。我只通过嵌套属性保存图像。我真的需要创建一个新的路线吗？如果是这样，它会是什么？

编辑（添加路由）

这是我的路线：

resources :projects do 
    member do 
    get 'add_photos' 
    post 'upload_photos' 

    end 
end 

Answer 1

<% @project.project_images.each do |image| %> 
    <%= image_tag image.photo.url(:thumb) %> 
    <div class="actions"> 
    <%= link_to "remove", project_path(@project.id, project: { project_images: { id: image.id, "_destroy" => true }}), remote: true, confirm: "Are you sure?", method: :put %> 
    </div> 
<% end %> 

Answer 2

刚刚在的link_to删除.photo，因为它不是一个对象，这是一个范围界定方法与photo工作（预览等）：

<% @project.project_images.each do |image| %> 
    <%= image_tag image.photo.url(:thumb) %> 
    <div class="actions"> 
    <%= link_to "remove", image, confirm: "Are you sure?", method: :delete %> 
    </div> <!-- maybe, you forgot it? --> 
<% end %>