Question

简而言之，我有一个用户模型和一个照片模型，用户有一个个人资料页面，我想让用户使用载波和嵌套文件将各种照片上传到他们的个人资料。

我正在为用户模型使用Devise。不知道我做错了什么，但我整天都在为这一天搞错，所以任何帮助都会非常感激。

先谢谢了！

错误：

First argument in form cannot contain nil or be empty

<%= nested_form_for @user, :html=>{:multipart => true } do |f| %>
<%= f.error_messages %>
<%= f.fields_for :photos do |photos| %>

user_profile.html.erb中的表单代码：

<%= nested_form_for @user, :html=>{:multipart => true } do |f| %>                                                                           
   <%= f.error_messages %>                                                                                                                   
   <%= f.fields_for :photos do |p|  %>                                                                                                  
   <p>                                                                                                                                       
   <%= p.label :photo %><br />                                                                                                          
   <%= p.file_field :photo %>                                                                                                           
   </p>                                                                                                                                      
   <%= p.link_to_remove "Remove this photo" %>                                                                            
   <% end %>                                                                                                                                 
   <%= f.link_to_add "Add attachment", :photos %>                                                                                            
   <p><%= f.submit %></p>                                                                                                                    
 <% end %>

注意：请记住，user_profile页面由devise支持，即到目前为止，所有form_for内容都在edit.html.erb页面中。这可能或可能与错误有关，但让我们继续。

User.rb snippit：

has_many :photos, as: :index_photos_on_user_id

  accepts_nested_attributes_for :photos

  mount_uploader :profile_image, ProfileImageUploader

Photo.rb

class Photos < ActiveRecord::Base
  attr_accessible :photo, :user_id

  mount_uploader :photo, PhotoUploader

  belongs_to :user, :polymorphic => true

end

架构：

create_table "photos", force: true do |t|
    t.string   "photo"
    t.integer  "user_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

add_index "photos", ["user_id"], name: "index_photos_on_user_id", using: :btree

create_table "users", force: true do |t|
 .... the rest here

sessions_controller.rb

class Users::SessionsController < Devise::SessionsController


  def new
    @user = User.new
  end

  private

  def after_sign_in_path_for(resource)
    if user_signed_in?
      welcome_path
    else
      new_user_registration_path
    end
  end


end

registrations_controller.rb

 class Users::RegistrationsController < Devise::RegistrationsController

  # POST /resource                                                                                                                                            

  def new
    @user = User.new
  end

  def update
    # For Rails 4                                                                                                                                             
    # account_update_params = devise_parameter_sanitizer.sanitize(:account_update)                                                                            
    # For Rails 3                                                                                                                                             
    account_update_params = params[:user]

    # required for settings form to submit when password is left blank                                                                                        
    if account_update_params[:password].blank?
      account_update_params.delete("password")
      account_update_params.delete("password_confirmation")
    end

    @user = User.find(current_user.id)
    if @user.update_attributes(account_update_params)
      set_flash_message :notice, :updated
      # Sign in the user bypassing validation in case his password changed                                                                                    
      sign_in @user, :bypass => true
      redirect_to after_update_path_for(@user)
    else
      render "edit"
    end
  end

  def account_registration
     @user = User.find(current_user.id)
  end

routes.rb snippit

devise_scope :user do
  #  get "edit/edit_account", :to => "devise/registrations#edit_account", :as => "account_registration"                                                       
    get 'edit/edit_account' => 'users/registrations#account_registration', as: :edit_account
    get '/welcome' => 'home#landing_welcome', as: :welcome
  end

Answer 1

您resource方法为零或空。所以，你有定义资源。

#app/helpers/application_helper.rb
module ApplicationHelper

  ## Devise helper method for resource
  def resource_name
    :user
  end

  def resource
    @resource ||= User.new
  end

  def devise_mapping
    @devise_mapping ||= Devise.mappings[:user]
  end
......
end

并在自定义控制器中包含此ApplicationHelper模块

#app/controllers/passwords_controller.rb
class PasswordsController < Devise::PasswordsController
  include ApplicationHelper
.........
end

表单中的第一个参数不能包含nil或为空（使用nested_forms +载波）

1 个答案: