我正在尝试在Rails中实现一个简单的登录系统,但是当我尝试显示登录用户的用户名时,我收到此错误:
can't convert Symbol into Integer
Extracted source (around line #60):
57: </ul>
58: <% if session[:logged_in] %>
59: <% user = session[:user] %>
60: <p class="pull-right">Howdy, <strong><%= user[:username] %></strong>!</p>
61: <% end %>
62: </div>
63: </div>
我的型号代码在这里:
require 'digest'
class User < ActiveRecord::Base
before_save {|user| user.password = Digest::SHA1.hexdigest(user.password)}
attr_accessible :username, :password, :email
validates_length_of :username, :password, :minimum => 7
validates_presence_of :username,:password,:email, :on => :create
validates_format_of :email, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
end
这就是我设置session [:user]:
的方法def create
if User.find(:all, :conditions => {:username => params[:username], :password => Digest::SHA1.hexdigest(params[:username])})
user = User.find(:all, :conditions => {:username => params[:username], :password => Digest::SHA1.hexdigest(params[:password])})
session[:user] = user
session[:logged_in] = true
redirect_to(:root, :notice => "Thanks for logging in!")
else
redirect_to(:new, :notice => "You supplied an invalid username/password combination.")
end
end
答案 0 :(得分:5)
可能session[:user]
不是Hash,正如您所期望的那样,而是一个数组。因此,使用除整数之外的任何内容来订阅它是无效的。
如何解决这个问题?更改实际设置会话变量的代码(如session[:user] = XYZ
)。
编辑: User.find(:all, ...)
返回一个数组,因此我假设您正在为session[:user]
分配一个数组。您应该只分配找到的第一个用户(事实上,应该只有一个符合条件)。更好的是,您应该只在会话中存储用户名,并在需要时从数据库中获取:
def create
user = User.where(:username => params[:username], :password => Digest::SHA1.hexdigest(params[:username])).first
if user
session[:user_id] = user.id
else
redirect_to(:new, :notice => "You supplied an invalid username/password combination.")
end
end
然后在与您的观点相关联的操作中:
def ...
@user = User.find(session[:user_id])
unless @user
# redirect to error page, user was deleted in the meantime
end
end
然后在视图中:
<%= @user.username %>
答案 1 :(得分:1)
将整个User对象转储到您的会话中是一个坏主意,这可能就是为什么您没有收回您的期望。您应该在User类上实现类似#to_session
的内容,以返回具有所需最少信息的哈希。类似的东西:
def to_session
{:id => id, :username => username, :email => email}
end
然后当您设置会话时:
session[:user] = user.to_session