在rails3中,我在模型中制作相同的范围.例如
class Common < ActiveRecord::Base
scope :recent,order('created_at DESC')
scope :before_at,lambda{|at| where("created_at < ?",at) }
scope :after_at,lambda{|at| where("created_at > ?",at) }
end
我想将公共范围拆分为lib中的模块.所以我试试这个.
module ScopeExtension
module Timestamps
def self.included(base)
base.send :extend,ClassMethods
end
module ClassMethods
scope :recent,lambda{order('created_at DESC')}
scope :before_at,at) }
scope :after_at,at) }
end
end
我写了这个
class Common < ActiveRecord::Base include ScopeExtension::Timestamps end
undefined method `scope' for ScopeExtension::Timestamps::ClassMethods:Module
(我没有忘记自动加载库)
如何在活动记录中轻松重用常用范围功能？
解决方法
我解决了这个调用self.included(class)的范围：
module Timestamps
def self.included(k)
k.scope :created_yesterday,k.where("created_at" => Date.yesterday.beginning_of_day..Date.yesterday.end_of_day)
k.scope :updated_yesterday,k.where("created_at" => Date.today.beginning_of_day..Date.today.end_of_day)
k.scope :created_today,k.where("created_at" => Date.today.beginning_of_day..Date.today.end_of_day)
k.scope :updated_today,k.where("created_at" => Date.today.beginning_of_day..Date.today.end_of_day)
end
end