Ruby on rails 未定义的方法`authenticate\u user！Api:：Device/Rails 4中的PostsController

我的项目中有以下路径：

  root 'home#index'

  namespace :api, defaults: { format: :json } do
    devise_for :users, controllers: { sessions: "api/sessions" }
    resources :posts
  end

用户模型：

class User < ActiveRecord::Base
    has_many :posts,        dependent: :destroy
    has_many :comments, dependent: :destroy

    validates :name, presence: true

    devise :database_authenticatable, :rememberable
end

class用户

会话控制器：

class Api::SessionsController < Devise::SessionsController
  def create
    @user = User.find_for_database_authentication(email: params[:user][:email])
    if @user && @user.valid_password?(params[:user][:password])
        sign_in(@user)
    else
        warden.custom_failure!
      @errors = [ 'Invalid email or password' ]
        render 'api/shared/errors', status: :unauthorized
    end
    end
end

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  #protect_from_forgery with: :exception
end

class Api::PostsController < ApplicationController
    before_action :authenticate_user!, only: [ :create ]

    def create
      current_user.posts.create!(post_params)
    end

    private

        def post_params
            params.require(:post).permit(:title, :content)
        end
end

class Api:：SessionController

应用程序控制器：

class Api::SessionsController < Devise::SessionsController
  def create
    @user = User.find_for_database_authentication(email: params[:user][:email])
    if @user && @user.valid_password?(params[:user][:password])
        sign_in(@user)
    else
        warden.custom_failure!
      @errors = [ 'Invalid email or password' ]
        render 'api/shared/errors', status: :unauthorized
    end
    end
end

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  #protect_from_forgery with: :exception
end

class Api::PostsController < ApplicationController
    before_action :authenticate_user!, only: [ :create ]

    def create
      current_user.posts.create!(post_params)
    end

    private

        def post_params
            params.require(:post).permit(:title, :content)
        end
end

class ApplicationController

最后，我的邮政管理员：

class Api::SessionsController < Devise::SessionsController
  def create
    @user = User.find_for_database_authentication(email: params[:user][:email])
    if @user && @user.valid_password?(params[:user][:password])
        sign_in(@user)
    else
        warden.custom_failure!
      @errors = [ 'Invalid email or password' ]
        render 'api/shared/errors', status: :unauthorized
    end
    end
end

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  #protect_from_forgery with: :exception
end

class Api::PostsController < ApplicationController
    before_action :authenticate_user!, only: [ :create ]

    def create
      current_user.posts.create!(post_params)
    end

    private

        def post_params
            params.require(:post).permit(:title, :content)
        end
end

class Api:：PostsController

---

但是当我尝试创建一个新的Post时，我得到了以下错误：“未定义的方法`authenticate\u user！Api:：PostsController”。如果我删除它，我会得到关于“current_user”方法的错误。有什么问题吗？我怎样才能修好它？提前感谢

我在使用designe时遇到了类似的问题。 问题是我用不同的名称而不是用户（我叫xuser）命名了我的db。 在我的例子中，我所要做的就是重命名控制器中的变量。 像这样的

before_action :authenticate_xuser!, only: [ :create ]

def create
    current_xuser.posts.create!(post_params)
end

private

def post_params
       params.require(:post).permit(:title, :content)
end

---

希望有帮助

由于在

routes.rb

文件中的

：api

命名空间中嵌套designe，因此会出现该错误。因此，您应该通过以下方式对用户进行身份验证：

class Api::PostsController < ApplicationController
    before_action :authenticate_api_user!, only: [ :create ]
end

class Api:：PostsController

这是一种非常奇怪的模式！