Question

我收到此错误消息：

Completed 500 Internal Server Error in 5ms (ActiveRecord: 0.0ms)

NoMethodError (undefined method `avatar=' for #<User::ActiveRecord_Relation:0x007f87e4c304d8>):
  app/controllers/api/v1/user_controller.rb:10:in `upload'

型号：

class User < ActiveRecord::Base
  acts_as_token_authenticatable

  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :confirmable

  mount_uploader :avatar, AvatarUploader

  validates_presence_of   :avatar
  validates_integrity_of  :avatar
  validates_processing_of :avatar
end

控制器：

module Api
  module V1
    class UserController < ApplicationController
      before_action :set_user, only: [:show, :update, :destroy]
      #before_filter :authenticate_user_from_token!

      def upload
        puts "here => " + params[:user][:email].to_s
        @user = User.where(email: params[:user][:email])
        @user.avatar = params[:user][:file]
        @user.save!
        p @user.avatar.url # => '/url/to/file.png'
        p @user.avatar.current_path # => 'path/to/file.png'
        p @user.avatar_identifier # => 'file.png'
      end
...

environment.rb中：

# Load the Rails application.
require File.expand_path('../application', __FILE__)

require 'carrierwave/orm/activerecord'

# Initialize the Rails application.
Rails.application.initialize!

生成了AvatarUploader，并通过迁移执行将avatar：string列添加到users表中。我不确定它有什么问题。

额外信息：我使用Rails：4.2.4，Ruby：2.2.1

非常感谢！

Answer 1

该错误非常有用。当您致电User.where(email: params[:user][:email])时，您无法获得User个对象，您将获得一个ActiveRecord_Relation个对象，该对象可能包含多个ActiveRecord个对象或为空。要获得一个User您要使用find_by而不是where，您就可以访问该虚拟角色。

RoR应用程序中来自Carrierwave的未定义化身方法

1 个答案: