无法在 ruby​​ on rails 中重定向到 current_user

Question

我是 ruby​​ on rails 的新手，我试图更新我的用户，但是当我的用户更新时，我无法重定向到我的 current_user。这是我的控制器：

class WelcomeController < ApplicationController
  def index
    @users = (current_user.blank? ? User.all : User.find(:all, :conditions => ["id != ?", current_user.id]))
  end

  def create
    user = User.login(params[:session][:username], params[:session][:pass])
    if user
      login user
      redirect_to root_url
    else
      redirect_to welcome_index_path
    end
  end

  def sucess
    @user = User.find(params[:id])
    @relation = Relation.new
  end

  def edit
    if current_user.update_attributes(:image => params[:image])
      logger.debug "image: #{current_user.image}"
      if current_user.changed?
        redirect_to current_user
      else
        render 'edit'
      end
    else
    end
  end

  def destroy
    logout
    redirect_to root_url
  end
end

我的路线

  get "uploads/new"

  get "micropost/new"

  get "user/new"
  get "user/saved"

  get "post/new"
  get "post/show"

  get "welcome/index"
  get "welcome/sucess"
  get "welcome/edit"
  get "welcome/test"
  root :to => "welcome#index"
  get '/users/:id', :to => 'welcome#sucess', :as => "user"  

  match '/relations', to: 'relation#create', via: 'post'
  match '/relations/:id', to: 'relation#destroy', via: 'delete'
  resources :users
  resources :relations,  only: [:create, :destroy]
  resources :microposts
  resources :uploads


  match '/welcome/edit', to: 'welcome#edit', via: 'post'
  match '/login', to: 'welcome#create', via: 'post'
  match '/logout' => 'welcome#destroy', as: :logout
  match '/create', to: 'micropost#create', via: 'post'
  match '/signup', to: 'user#signup', via: 'post'

当我检查日志文件时：

  Started POST "/welcome/edit?method=post" for 127.0.0.1 at 2014-11-13 15:09:00 +0700
Processing by WelcomeController#edit as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"XHQeEBjnndipJ8c4TrOnn5Yzh7xqvcEhl4+L7BbGBY0=", "image"=>"Hydrangeas.jpg", "commit"=>"Save", "method"=>"post"}
  [1m[35mUser Load (1.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36m (0.0ms)[0m  [1mbegin transaction[0m
  [1m[35mUser Exists (0.0ms)[0m  SELECT 1 AS one FROM "users" WHERE ("users"."username" = 'sa1234' AND "users"."id" != 10) LIMIT 1
  [1m[36m (1.0ms)[0m  [1mUPDATE "users" SET "image" = 'Hydrangeas.jpg', "updated_at" = '2014-11-13 08:09:00.576402' WHERE "users"."id" = 10[0m
  [1m[35m (157.0ms)[0m  commit transaction
  [1m[36mUser Load (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
image: Hydrangeas.jpg
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  Rendered welcome/edit.html.erb within layouts/application (4.0ms)
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
Completed 200 OK in 219.0ms (Views: 52.0ms | ActiveRecord: 159.0ms)

如果我的 current_user 更新不成功，我不知道我的应用程序如何渲染编辑，拜托！帮我解决这个问题:)

更新： @Jakob S，这是我尝试您的代码时的日志：

Started GET "/welcome/edit" for 127.0.0.1 at 2014-11-13 15:21:57 +0700
Processing by WelcomeController#edit as HTML
  [1m[36mUser Load (1.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35m (0.0ms)[0m  begin transaction
  [1m[36mUser Exists (1.0ms)[0m  [1mSELECT 1 AS one FROM "users" WHERE ("users"."username" = 'sa1234' AND "users"."id" != 10) LIMIT 1[0m
  [1m[35m (0.0ms)[0m  commit transaction
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
image: 
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
Redirected to http://localhost:3000/users/10
Completed 302 Found in 5.0ms (ActiveRecord: 2.0ms)


Started GET "/users/10" for 127.0.0.1 at 2014-11-13 15:21:57 +0700
Processing by WelcomeController#sucess as HTML
  Parameters: {"id"=>"10"}
  [1m[36mUser Load (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", "10"]]
  [1m[35mUser Load (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35mUser Load (0.0ms)[0m  SELECT "users".* FROM "users" INNER JOIN "relations" ON "users"."id" = "relations"."following_id" WHERE "relations"."follower_id" = 10
  [1m[36mUser Load (0.0ms)[0m  [1mSELECT "users".* FROM "users" INNER JOIN "relations" ON "users"."id" = "relations"."follower_id" WHERE "relations"."following_id" = 10[0m
  Rendered welcome/sucess.html.erb within layouts/application (7.0ms)
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 10]]
  [1m[35mCACHE (0.0ms)[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
Completed 200 OK in 39.0ms (Views: 37.0ms | ActiveRecord: 0.0ms)

Answer 1

current_user.changed? 引起了您的问题。

changed? 是 Rails 的Dirty model checking 的一部分。保存模型时会重置模型的脏状态（即更改了哪些属性）。

update_attributesupdates all attributes and saves the object。因此，current_user.changed? 将始终紧跟在update_attributes 之后的false，因为自上次保存后模型尚未更改。

删除changed? 及其相关render "edit" 部分的检查，你应该很高兴：

def edit
  if current_user.update_attributes(:image => params[:image])
    redirect_to current_user
  else
    render 'edit'
  end
end

额外提示：一般而言，像您正在实施的操作（更新资源的操作）通常会出现在 update 操作中。 edit 动作通常用于渲染 UI 以更改资源。