Question

我有3个型号：

用户
Dish
Dish_Image

我正在使用devise，paperclip和aws s3创建用户并将图像附加到菜肴上。

问题：菜单正在创建并正确关联到用户，但图像信息未插入dish_image表中，并且在任何地方都看不到任何错误。

我提供了我认为可能需要的代码片段，但如果需要更多信息，请告诉我。

app / models / user.rb

Class User < ActiveRecord::Base
  has_many :dishes

app / models / dish.rb

class Dish < ActiveRecord::Base
  belongs_to :user, dependent: :delete
  has_many :dish_images
  accepts_nested_attributes_for :dish_images

app / models / dish_image.rb

class DishImage < ActiveRecord::Base
  belongs_to :dish, dependent: :delete
  has_attached_file :d_image, styles: {
    thumb: '100x100>',
    square: '200x200#',
    medium: '300x300>'
  }
  # Validate the attached image is image/jpg, image/png, etc
  validates_attachment_content_type :d_image, :content_type => /\Aimage\/.*\Z/
end

我的dish_images_controller.rb文件用于创建读取

def create

    @dish = Dish.find(params[:dish_id])
    @dish_image = @dish.dishimages.build(dish_image_params)
    if @dish_image.save!
      flash[:success] = "Image has been uploaded!"
    else
      flash[:notice] = "Image upload did not work!"
    end
  end

private    
    def dish_image_params
      params.require(:dish_image).permit(:d_image)
    end

上传视图是

%h2 New Dish
= bootstrap_form_for([current_user, @dish], :html => { :multipart => true }) do |f|
  %div
    = f.text_field :title, autofocus: true
  %div
    = f.text_field :desc, autofocus: true
  %div
    = f.fields_for :dish_images do |ff|
      Dish Image:
      = ff.file_field :d_image, hide_label: true
  %div= f.submit "Submit Dish"

和rake路线给出：

user_dish_dishimages     GET    /users/:user_id/dishes/:dish_id/dishimages(.:format)     dishimages#index
                         POST   /users/:user_id/dishes/:dish_id/dishimages(.:format)     dishimages#create
user_dish_dishimage      DELETE /users/:user_id/dishes/:dish_id/dishimages/:id(.:format) dishimages#destroy

Answer 1

问题：菜肴正在创建并正确关联到用户，但图像信息未插入 dish_image表，任何地方都没有错误。

首先，提交嵌套表单时，将调用create的{{1}}操作。要保存dish_images记录，您需要在DishesController中将dish_images_attributes列入白名单。

例如：

DishesController

注意：如果您已经有def dish_params params.require(:dish).permit(:title, :desc, dish_images_attributes: [:id, :d_image]) end方法将属性列入白名单，则只需更新传递给其中dish_params的参数即可。如果您的白名单属性方法的名称不是permit，请相应地更新。

第二度has_many模型的嵌套表格不起作用

1 个答案: