我目前正在学习Michael Hartl的教程。我正在做一些修改以适应我的应用程序。我需要包括的一项功能是，当用户以管理员身份登录时，他们会被引导到另一个页面，在那里他们可以创建或删除更多用户等。我在用户表中创建了一个名为admin的布尔值，并将管理员记录设置为TRUE。
这是我的users_controller.rb
class UsersController < ApplicationController
before_action :logged_in_user, only: [:index, :edit, :update]
before_action :correct_user, only: [:edit, :update]
def index
@users = User.all
end
def show
@user = User.find(params[:id])
end
def new
@user = User.new
end
def create
@user = User.new(user_params)
if @user.save
log_in @user
flash[:success] = "Welcome to the Sample App!"
redirect_to @user
else
render 'new'
end
end
def edit
@user = User.find(params[:id])
end
def update
@user = User.find(params[:id])
if @user.update_attributes(user_params)
flash[:success] = "Profile updated"
redirect_to @user
# Handle a successful update.
else
render 'edit'
end
end
private
def user_params
params.require(:user).permit(:name, :email, :password,
:password_confirmation)
end
# Before filters
# Confirms a logged-in user.
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "Please log in."
redirect_to login_url
end
end
# Confirms the correct user.
def correct_user
@user = User.find(params[:id])
redirect_to(root_url) unless current_user?(@user)
end
end
以下是我的会话_controller
class SessionsController < ApplicationController
def new
end
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
log_in user
params[:session][:remember_me] == '1' ? remember(user) : forget(user)
#remember user
#redirect_to user
redirect_back_or user
# Log the user in and redirect to the user's show page.
else
# Create an error message
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
def destroy
log_out if logged_in?
redirect_to root_url
end
end
我的会话_帮助下一个
module SessionsHelper
# Logs in the given user.
def log_in(user)
session[:user_id] = user.id
end
# Remembers a user in a persistent session.
def remember(user)
user.remember
cookies.permanent.signed[:user_id] = user.id
cookies.permanent[:remember_token] = user.remember_token
end
# Returns the user corresponding to the remember token cookie.
def current_user
if (user_id = session[:user_id])
@current_user ||= User.find_by(id: user_id)
elsif (user_id = cookies.signed[:user_id])
user = User.find_by(id: user_id)
if user && user.authenticated?(cookies[:remember_token])
log_in user
@current_user = user
end
end
end def logged_in?
!current_user.nil?
end
# Logs out the current user.
def log_out
forget(current_user)
session.delete(:user_id)
@current_user = nil
end
# Forgets a persistent session.
def forget(user)
user.forget
cookies.delete(:user_id)
cookies.delete(:remember_token)
end
# Returns true if the given user is the current user.
def current_user?(user)
user == current_user
end
# Redirects to stored location (or to the default).
def redirect_back_or(default)
redirect_to(session[:forwarding_url] || default)
session.delete(:forwarding_url)
end
def redirect_to_admin_page
redirect_to 'index'
end
# Stores the URL trying to be accessed.
def store_location
session[:forwarding_url] = request.url if request.get?
end
最后是我的路线文件
Rails.application.routes.draw do
get 'sessions/new'
root 'static_pages#home'
get 'static_pages/home'
get 'static_pages/landing'
get 'home' => 'static_pages#home'
get 'landing' => 'static_pages#landing'
get 'signup' => 'users#new'
get 'login' => 'sessions#new'
post 'login' => 'sessions#create'
delete 'logout' => 'sessions#destroy'
resources :users
end
如果有人能给我指一个正确的方向，那就太棒了。
RgrdsDavid
哪里有
redirect_back_or user
只需更改为
if admin_user? # typically this is helper
redirect_to admin_page # adjust to your app.. i.e. where you want to go
else
redirect_back_or user
end
在哪里admin_user？定义如下：
def admin_user?
current_user && current_user.admin?
# assuming admin is the name of your boolean field.
end
通常是admin_user？将是以与current_user 相同的位置/方式定义的助手
就像这个Mitch
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
log_in user
params[:session][:remember_me] == '1' ? remember(user) : forget(user)
#remember user
#redirect_to user
if admin_user
redirect_to_admin_page
else
redirect_back_or user
end
# Log the user in and redirect to the user's show page.
else
# Create an error message
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
模块SessionsHelper 中似乎有未声明的函数redirect_back_or
模块SessionsHelper中的一些相关有用功能将被定义为：
def redirect_back_or(default)
redirect_to(session[:return_to] || default)
clear_return_to
end
def store_location
session[:return_to] = request.fullpath
end
def clear_return_to
session[:return_to] = nil
end
您可以使用store_location保存当前路径，并在用户登录时重定向用户。
在您的情况下，它应该是这样的：
def redirect_back_or(default)
if user.admin?
redirect_to admin_page # the page you want admin to redirect
else
redirect_to (session[:return_to] || default)
end
end
在我的会话助手中，我没有像这样定义admin_user
# Returns true if the given user is the current user.
def current_user?(user)
user == current_user
end
def admin_user?
current_user && current_user.admin?
end
# Redirects to stored location (or to the default).
def redirect_back_or(default)
redirect_to(session[:forwarding_url] || default)
session.delete(:forwarding_url)
end
我的会话控制器中的创建方法现在是这样的
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
log_in user
params[:session][:remember_me] == '1' ? remember(user) : forget(user)
#remember user
#redirect_to user
if admin_user
redirect_to root_url
else
redirect_back_or user
end
# Log the user in and redirect to the user's show page.
else
# Create an error message
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
然而，当我尝试登录时，我得到了以下错误
SessionsController#create中的名称错误#的未定义局部变量或方法"admin_user"
您可以拥有类似的东西
def admin_user
redirect_to(root_url, status: :see_other) unless current_user.admin?
end