Question

使用Rails 3.2和Paperclip保存照片。我正在尝试将用户的ID保存到user_id表中的photos，photos_count表users中的计数器缓存增量。 photos已在另一个shops上传。照片上传了，但我无法将user对象传递给photo模型以实现其奇迹。

事情不起作用：

用户ID无法保存在photos表user_id列

photos_count

users

shops都不会增加。

以下是我的代码：

# photo.rb
class Photo < ActiveRecord::Base
  belongs_to :attachable, :polymorphic => true, :counter_cache => true
  belongs_to :user, :counter_cache => true
  attr_accessible :data, :attachable_id, :attachable_type, :user_id
end

# shop.rb
class Shop < ActiveRecord::Base  
  attr_protected :reviews_count, :rating_average, :photos_count
  has_many :photos, :as => :attachable, :dependent => :destroy
  accepts_nested_attributes_for :photos, :allow_destroy => true
end

# photos_controller.rb
class PhotosController < ApplicationController
end

# shops_controller.rb
class ShopsController < ApplicationController
  before_filter :require_user, :only => [:new, :edit, :update, :create]

  def new
    @shop = Shop.new
  end

  def edit
    @shop = Shop.find(params[:id])
  end

  def update
    @shop = Shop.find(params[:id])
    if @shop.update_attributes(params[:shop])
      flash[:notice] = 'Successfully updated.'
      redirect_to shop_path(@shop)
    else
      render :action => :edit
    end
  end

  def create
    @shop = Shop.new(params[:shop])
    if @shop.save
      flash[:notice] = 'Successfully saved.'
      redirect_to shop_path(@shop)
    else
      render :action => :new
    end
  end
end

# shops/_form.html.erb
<%= form_for @shop, :url => { :action => action, :type => type }, :html => { :multipart => true } do |f| %>
  <%= f.text_field :name %>
  <%= f.file_field :shop_photos_data, :multiple => true, :name => "shop[photos_attributes][][data]" %>
<% end %>

我尝试将其放入photo.rb，但返回user为零：

  after_create :save_associated_user

  private

  def save_associated_user
    self.user_id = self.user
  end

Answer 1

您需要attr_accessible user_id，而非用户。

Answer 2

在表格中你必须在photos_attributes中设置user_id，类似这样，

<%= form_for @shop, :url => { :action => action, :type => type }, :html => { :mult ipart  => true } do |f| %>
  <%= f.text_field :name %>
  <%= f.file_field :shop_photos_data, :multiple => true, :name => "shop[photos_attributes][][data]" %>
  <%= f.hidden_field :shop_photos_user_id, :value => current_user.id, :multiple => true, :name => "shop[photos_attributes][][user_id]" %>
<% end %>

提交后，您需要调用一些回调来更新用户表中的photos_count

将用户对象从一个模型传递到另一个模型

2 个答案: