未知属性：头像上传图片时出现此错误

Question

我在 15 和 99 的注册控制器中遇到错误 我已经在我的应用中完成了以下操作

def user_params
#assumption: user params are coming in params[:user]
params.require(:user).permit(:first_name, :last_name, :mobile, :uid, :provider, :avatar )
end
in user.rb

has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" }, :default_url => "/images/:style/missing.png"
validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/

in migration

class AddAvatarToUsers < ActiveRecord::Migration
  def change

add_attachment :users, :avatar

  end
end

ActiveRecord::UnknownAttributeError in MyDevise::RegistrationsController#create

app/controllers/my_devise/registrations_controller.rb:99:in `build_resource'
app/controllers/my_devise/registrations_controller.rb:15:in `create'

提取的源代码（第 99 行附近）：

def create
15.   self.resource = build_resource(sign_up_params)
if resource.save
  # yield resource if block_given?
  if resource.active_for_authentication?
    set_flash_message :notice, :signed_up if is_flashing_format?
    sign_up(resource_name, resource)
    respond_with resource, :location => after_sign_up_path_for(resource)
  else
    set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_flashing_format?
    expire_data_after_sign_in!
    respond_with resource, :location => after_inactive_sign_up_path_for(resource)
  end
else
  clean_up_passwords resource
  respond_with resource
end
end

# temporary session data to the newly created user.
def build_resource(hash=nil)
99   self.resource = resource_class.new_with_session(hash || {}, session)
end

# Signs in a user on sign up. You can overwrite this method in your own

Answer 1

Build

我认为您的问题与 Devise building 您的对象有关：

def build_resource(hash=nil)
    self.resource = resource_class.new_with_session(hash || {}, session)
end

您对 Devise 的操作感到困惑（最好别管 Devise 并在其上添加功能）

---

额外字段

这是我要做的：

1. 设置 Devise 以处理额外的属性
2. 添加额外属性在注册后

---

Params

class ApplicationController < ActionController::Base
  before_filter :configure_permitted_parameters, if: :devise_controller?

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) << :avatar
  end
end

---

字段

您可以在注册新用户时使用这些资源为您的模型添加额外的属性：

• RailsCast - Customizing Devise
• Blog - Adding Custom Fields To Devise

从外观上看，更改参数选择器，您应该可以通过注册表单上传avatar图像