Ruby on Rails的：創建刪除鏈接關聯對象

Question

收到此錯誤：

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

我試圖創建一個刪除鏈接到我的相關圖像

<% @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是錯的，但我不確定它應該是什麼？我想我應該確定路徑是什麼？但是我沒有ProjectImages的路線。我只通過嵌套屬性保存圖像。我真的需要創建一個新的路線嗎？如果是這樣，它會是什麼？

編輯（添加路由）

這是我的路線：

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

剛剛在的link_to刪除.photo，因爲它不是一個對象，這是一個範圍界定方法與photo工作（預覽等）：

<% @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 %>