Question

我尝试添加到我的应用'carrierwave'gem.I创建一个类 image_uploader

class ImageUploader < CarrierWave::Uploader::Base

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end
end

并创建一个模型 photo.rb

class Photo < ActiveRecord::Base
  mount_uploader :image, ImageUploader
  belongs_to :photoable, polymorphic: true
  belongs_to :post
end

和 photo.rb 与 post.rb

具有多态关联

class Post < ActiveRecord::Base
  has_many :comments
  has_many :post_attachments
  validates :title, :body, presence: true
  has_many :photos, as: :photoable
  accepts_nested_attributes_for :photos
end

post.rb 具有来自 photo.rb 的嵌套属性

  params.require(:post).permit(:title, :body, photo_attributes: [:image])

这是来自 post.rb 模型

的部分 _form.html.haml

= form_for [:admin, @post] do |f|
  = f.file_field :image
  = f.text_field :title, class: "form-control", placeholder: "Title"
  = f.text_area :body, rows: 12, class: "form-control", placeholder: "Message"
  .pull-right
    = f.submit "Send", class: "btn btn-success"

但是当我创建一个带有图片的帖子时，shell会显示错误

Unpermitted parameters: image

如何解决？

抱歉我的英文不好

UPD

schema.rb

create_table "photos", force: true do |t|
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "image"
    t.integer  "photoable_id"
    t.string   "photoable_type"
  end

  create_table "posts", force: true do |t|
    t.string   "title"
    t.text     "body"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

解决

Answer 1

我认为它应该是photos_attributes。

params.require(:post).permit(:title, :body, photo_attributes: [:image])
                                                ^^

Answer 2

问题是您没有将fields_for用于image属性。

而不是= f.file_field :image，您需要：

= f.fields_for :photos do |photo_fields| %>
   = photo_fields.file_field :image

然后，将params.require(:post).permit(:title, :body, photo_attributes: [:image])更改为：

params.require(:post).permit(:title, :body, photos_attributes: [:image])

不允许的参数：image.Carrierwave

2 个答案: