DoubleRenderError：「渲染和/或重定向在這次行動中被多次」

Question

我想用戶的role_ids重定向：

• 如果它是等於2，重定向到workers_path。
• 如果它等於1，則重定向到tasksadmins_path。

我定義的下一個事情：

class ApplicationController < ActionController::Base 
    include ApplicationHelper 

    protect_from_forgery 
    before_filter :authenticate_user! 

    def stored_location_for(user) 
    nil 
    end 

    def after_sign_in_path_for(user) 
    if current_user.role_ids == [2] 
     return redirect_to(workers_path) 
    else 
     return redirect_to (tasksadmins_path) 
    end 
    end 
end 

但是當我登錄，我得到了錯誤：

AbstractController::DoubleRenderError in UserSessionsController#create 

Render and/or redirect were called multiple times in this action. Please note 
that you may only call render OR redirect, and at most once per action. Also 
note that neither redirect nor render terminate execution of the action, so 
if you want to exit an action after redirecting, you need to do something 
like "redirect_to(...) and return". 
Rails.root: /home/alon/alon/todolist 

Application Trace | Framework Trace | Full Trace 
app/controllers/user_sessions_controller.rb:5:in `create' 
Request 

Parameters: 

{"utf8"=>"✓", 
"authenticity_token"=>"jRNZkIXvToEhl9YVxaQoa2hLJiSaHI6JAdfpUNAQMJI=", 
"user"=>{"email"=>"worker216@gmail.com", 
"password"=>"[FILTERED]", 
"remember_me"=>"0"}, 
"commit"=>"Sign in"} 

這是我user_session_controller.rb：

class UserSessionsController < Devise::SessionsController 
    include ApplicationHelper 

    def create 
     response = super 

     require "uri" 
     require "net/http" 

     ## get the user id from the database 
     user_id = session['warden.user.user.key'][1][0]; 

     ## get the row by id 
     user = User.find(user_id) 

     # ============================ 
     # Ensure that a user exists 
     # ============================ 

     code, body = http_request(Net::HTTP::Put.new("/api/v1/users/external/#{user_id}"), email: user.email); 
     if code != 200 
     Rails.logger.error("Unable to register user #{current_user.email} at Licensario"); 
     end 

     response 
    end 
end 

這是我的routes.rb：

TODOLIST::Application.routes.draw do 

    devise_for :users, :controllers => { :sessions => 'user_sessions'} do 
     get '/users/sign_out' => 'devise/sessions#destroy' 
    end 

    resources :tasksadmins 
    resources :workers 
    root to: "workers#index" 
end 

Answer 1

我加入到 '創造' 的下一行：在開始

，我寫道：

​​

，然後我在最後寫道： '創建'功能：

sign_in(resource_name, resource) 

if current_user.role_ids == [2] 
    respond_with resource, :location => workers_path 
else 
    respond_with resource, :location => tasksadmins_path 
end 

所以我創建看起來如此：

class UserSessionsController < Devise::SessionsController 
    include ApplicationHelper 

    def create 

     resource = warden.authenticate!(:scope => resource_name) 

     require "uri" 
     require "net/http" 

     ## get the user id from the database 
     user_id = session['warden.user.user.key'][1][0]; 

     ## get the row by id 
     user = User.find(user_id) 

     # ============================ 
     # Ensure that a user exists 
     # ============================ 

     code, body = http_request(Net::HTTP::Put.new("/api/v1/users/external/#{user_id}"), email: user.email); 
     if code != 200 
      Rails.logger.error("Unable to register user #{current_user.email} at Licensario"); 
     end 

     sign_in(resource_name, resource) 

     if current_user.role_ids == [2] 
      respond_with resource, :location => workers_path 
     else 
      respond_with resource, :location => tasksadmins_path 
     end 

    end 
end 

Answer 2

您不應該在after_sign_in_path_for中返回redirect_to。您應該返回網址：

def after_sign_in_path_for(user) 
    if current_user.role_ids == [2] 
     return workers_url 
    else 
     return tasksadmins_url 
    end 
    end