诚然，这个问题很长。因此，我感谢 rubytutorial 社区的任何支持。我在第 9 章，尝试为登录用户创建会话。
我已经在 < Rails 3.1 中完成了教程。因为我现在使用的是 Rails 3.1，所以我继续阅读第 13 章并链接到（非常好的）Railscasts (#270) 关于这个主题。多亏了 has_secure_password，我能够很容易地重写我的用户注册。
当我尝试使用数据库中的用户登录时，我在控制台中看到了这个）：
No route matches {:action=>"show", :controller=>"users"}
好像我需要创建一条路线，它应该可以工作。但如果是这样的话，为什么我可以去 'users/1' 并出现视图？我在会话和用户控制器（下）中使用路由 user_path(@user)、@user。
这就是我所做的。
将表单传递给 Session 控制器新操作（注意：我使用 form_tag 而不是 form_for）
<%= form_tag sessions_path do %>
<div class="field">
<%= label_tag :email %><br />
<%= text_field_tag :email, params[:email] %>
</div>
<div class="field">
<%= label_tag :password %><br />
<%= password_field_tag :password %>
</div>
<div class="actions">
<%= submit_tag "Sign In" %>
</div>
<% end %>
然后，在 session_controller.rb 中创建动作
def create
#Assign object by email attribute
user = User.find_by_email(params[:email])
# User is present and has access, must be true otherwise nil object
if user && user.authenticate(params[:password])
session[:user_id] = user.id
RIGHT HERE IS THE PROBLEM
redirect_to user_path(@user), :notice => "Logged in!"
else
#Use flash.now on render not flash[]
flash.now.alert = "Invalid email or password"
render "new"
end
end
最后为 users_controller.rb 创建操作，效果很好。
def create
@user = User.new(params[:user])
if @user.save
flash[:success] = "Welcome to the Sample App!"
redirect_to @user
else
render "new"
@user.password.clear
@user.password_confirmation.clear
end
end
离开我的用户模型：
attr_accessible :name, :email, :password, :password_confirmation
email_regex = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
has_secure_password
哦，这是我当前的 routes.rb 文件
resources :users
resources :sessions, only: [:create, :new, :destroy]
root to: "pages#home"
match "/about", to: "pages#about"
match "/contact", to: "pages#contact"
match "/help", to: "pages#help"
match "/signup", to: "users#new"
match "/signin", to: "sessions#new"
match "/signout", to: "sessions#destroy"
最后是我运行 rake 路由时的输出：
users GET /users(.:format) {:action=>"index", :controller=>"users"}
POST /users(.:format) {:action=>"create", :controller=>"users"}
new_user GET /users/new(.:format) {:action=>"new", :controller=>"users"}
edit_user GET /users/:id/edit(.:format) {:action=>"edit", :controller=>"users"}
user GET /users/:id(.:format) {:action=>"show", :controller=>"users"}
PUT /users/:id(.:format) {:action=>"update", :controller=>"users"}
DELETE /users/:id(.:format) {:action=>"destroy", :controller=>"users"}
sessions POST /sessions(.:format) {:action=>"create", :controller=>"sessions"}
new_session GET /sessions/new(.:format) {:action=>"new", :controller=>"sessions"}
session DELETE /sessions/:id(.:format) {:action=>"destroy", :controller=>"sessions"}
root / {:controller=>"pages", :action=>"home"}
about /about(.:format) {:controller=>"pages", :action=>"about"}
contact /contact(.:format) {:controller=>"pages", :action=>"contact"}
help /help(.:format) {:controller=>"pages", :action=>"help"}
signup /signup(.:format) {:controller=>"users", :action=>"new"}
signin /signin(.:format) {:controller=>"sessions", :action=>"new"}
signout /signout(.:format) {:controller=>"sessions", :action=>"destroy"}