2007-07-13

实战Hilog笔记三:@current_user/logged_in?/require_login/editable?

1,在ApplicationController里添加几个辅助方法: 
class ApplicationController < ActionController::Base
  session :session_key => '_hilog_session_id'
  before_filter :load_defaults
  helper_method :logged_in? 

  protected

    def load_defaults
      @current_user =
        if logged_in?
          User.find(session[:user_id])
        else
          nil
        end
    end
    
    def logged_in?
      session[:user_id]
    end
    
    def require_login
      redirect_to(new_session_url(:go_after => request.request_uri)) and return false unless session[:user_id]
    end

end

load_defaults得到当前登录的用户@current_user
helper_method让logged_in?方法可以在rhtml页面里使用
require_login是一些需要登录权限才能操作的action的before_filter

2,在Topic模型类里添加editable_by?方法: 
class Topic < ActiveRecord::Base
  belongs_to :user
  
  def editable_by?(account)
    account && (account.id == user.id )
  end
  
end

这样可以在rhtml页面和controler里判断topic是否可以被@current_user编辑和删除
评论
hideto 2007-07-13   回复
3,SessionController里控制登录后url转发:
class SessionController < ApplicationController

  def new
    session[:go_after] = params[:go_after] if params[:go_after]
  end
  
  def create
    if @user = User.authenticate(params[:loginId], params[:password])
      session[:user_id] = @user.id
      redirect_to (session[:go_after] || params[:go_after] || blog_path(@user.loginId))
    else
      flash[:notice] = "用户名或密码不正确."
      render :action => 'new'
    end
  end

  def destroy
    session.delete
    flash[:notice] = "您已经注销."
    redirect_to home_path
  end

end
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