访问模型中的 current_user [英] Access current_user in model

问题描述

我有 3 张桌子

items (columns are:  name , type)
history(columns are: date, username, item_id)
user(username, password)

当用户说ABC"登录并创建新项目时，将使用以下 after_create 过滤器创建历史记录.如何通过此过滤器将此用户名ABC"分配给历史表中的用户名字段.

When a user say "ABC" logs in and creates a new item, a history record gets created with the following after_create filter. How to assign this username ‘ABC’ to the username field in history table through this filter.

class Item < ActiveRecord::Base
  has_many :histories
  after_create :update_history
  def update_history
    histories.create(:date=>Time.now, username=> ?) 
  end
end

我在 session_controller 中的登录方法

My login method in session_controller

def login
  if request.post?
    user=User.authenticate(params[:username])
    if user
      session[:user_id] =user.id
      redirect_to( :action=>'home')
      flash[:message] = "Successfully logged in "
    else
      flash[:notice] = "Incorrect user/password combination"
      redirect_to(:action=>"login")
    end
  end
end

我没有使用任何身份验证插件.如果可能的话，如果有人能告诉我如何在不使用插件(如 userstamp 等)的情况下实现这一点，我将不胜感激.

I am not using any authentication plugin. I would appreciate if someone could tell me how to achieve this without using plugin(like userstamp etc.) if possible.

推荐答案

Rails 5

声明一个模块

module Current
  thread_mattr_accessor :user
end

分配当前用户

class ApplicationController < ActionController::Base
  around_action :set_current_user
  def set_current_user
    Current.user = current_user
    yield
  ensure
    # to address the thread variable leak issues in Puma/Thin webserver
    Current.user = nil
  end             
end

现在您可以将当前用户称为 Current.user

Now you can refer to the current user as Current.user

关于 thread_mattr_accessor

在模型中访问 current_user 并不常见.话虽如此，这里有一个解决方案:

It is not a common practice to access the current_user within a model. That being said, here is a solution:

class User < ActiveRecord::Base
  def self.current
    Thread.current[:current_user]
  end

  def self.current=(usr)
    Thread.current[:current_user] = usr
  end
end

在 ApplicationController 的 around_filter 中设置 current_user 属性.

Set the current_user attribute in a around_filter of ApplicationController.

class ApplicationController < ActionController::Base
  around_filter :set_current_user

  def set_current_user
    User.current = User.find_by_id(session[:user_id])
    yield
  ensure
    # to address the thread variable leak issues in Puma/Thin webserver
    User.current = nil
  end             
end

认证成功后设置current_user:

def login
  if User.current=User.authenticate(params[:username], params[:password])
    session[:user_id] = User.current.id
    flash[:message] = "Successfully logged in "
    redirect_to( :action=>'home')
  else
    flash[:notice] = "Incorrect user/password combination"
    redirect_to(:action=>"login")
  end
end

最后参考Item的update_history中的current_user.

class Item < ActiveRecord::Base
  has_many :histories
  after_create :update_history
  def update_history
    histories.create(:date=>Time.now, :username=> User.current.username) 
  end
end

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