如何使多态模型工作?

Question

我有两个模型User和Image作为多态关联，因为我希望我的图像模型在其他模型中重用。

class User < ApplicationRecord
has_one :cart
has_many :images, as: :imageable, dependent: :destroy
accepts_nested_attributes_for :images
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
before_validation :set_name, on: :create
validates :name, presence: true
private
def set_name
self.name = "person#{rand(1000)}" if self.name.blank?
end
end
class Image < ApplicationRecord
mount_uploader :image, ImageUploader
belongs_to :imageable, polymorphic: true
end

我使图像多态：真实并使用载波宝石创建上传器'mount_uploader mount_uploader：图像，图像中的图像上传器 模型：图像

class ImageUploader < CarrierWave::Uploader::Base
end
and I permit :image parameters to each model: User and Good,
module Admin
class UsersController < BaseController
before_action :set_admin_user, only: [:show, :edit, :update, :destroy]
def users_list
@admin_users = User.all.preload(:images).where(admin: true)
end
def show
end
def edit
end
def update
if @user.images.update(admin_user_params)
redirect_to admin_users_list_path, notice: 'User was successfully updated'
else
flash[:alert] = 'User was not updated'
end
end
def destroy
end
private
def set_admin_user
@user = User.find(params[:id])
end
def admin_user_params
params.require(:user).permit(:name, :email, images_attributes: [:image])
end
end
end

在我的视图表单中，我有下一个代码：

<%= form_for [:admin, @user], html: { multipart: true } do |f| %>
<%= f.label 'Name', class: 'form-group' %>
<%= f.text_field :name, class: 'form-control' %>
<%= f.fields_for :images_attributes do |i| %>
<%= i.label :image %>
<%= i.file_field :image %>
<% end %>
<%= f.label 'Email', class: 'form-group' %>
<%= f.text_field :email, class: 'form-control' %>
<%= f.submit class: 'btn btn-oultline-primary' %>
<% end %>

但是当我想更新用户时，例如尝试上传图像，我得到了下一个：

这是我的回应

我无法保存上传图片。为什么？我希望插入数据库，但它没有发生，并且在数据库中我没有附加的图像。

Answer 1

由于您要添加多个图像，请将表单更改为：

<%= i.file_field :image, multiple: true, name: "images_attributes[image][]" %>

在控制器中：

def edit
@image = @user.images.build
end
def update
if @user.images.update(admin_user_params)
create_user_images
redirect_to admin_users_list_path, notice: 'User was successfully updated'
else
flash[:alert] = 'User was not updated'
end
end
private
def admin_user_params
params.require(:user).permit(:name, :email, images_attributes: [:id, :user_id, :image])
end
def create_user_images
if params[:images_attributes]
params[:images_attributes]['image'].each do |i|
@image = @user.images.create!(:image => i)
end
end
end

如果您在编辑后仍有问题，请告诉我:)