如何爲SQL語句編寫Rails 4作用域？

Question

目前我正在將我的應用程序升級到rails 4.i知道在用於SQL語句的rails4中編寫範圍時會進行一些語法更改。下面 是軌道3範圍：

scope :current_active_leases,  group("leases.id").where("leases.commencement <= ? and (leases.expiration >= ? or leases.mtm=?) and leases.is_executed= ? ", Time.now.strftime("%Y-%m-%d"), Time.now.strftime("%Y-%m-%d"), true, true) 

如何在軌改寫這個4

Answer 1

我想無論你所寫的內容應該工作，但在軌道4,5你應該寫這樣

scope :current_active_leases, -> {group("leases.id").where("leases.commencement <= ? and (leases.expiration >= ? or leases.mtm=?) and leases.is_executed= ? ", Time.now.strftime("%Y-%m-%d"), Time.now.strftime("%Y-%m-%d"), true, true) } 

檢查文檔 http://api.rubyonrails.org/classes/ActiveRecord/Scoping/Named/ClassMethods.html#method-i-scope