Rails:使该查询与数据库无关...? [英] Rails: Making this query database-agnostic...?

问题描述

我的模型中有这两行是为PostgreSQL编写的:

I have these two lines in my model, written for PostgreSQL:

named_scope :by_month, lambda { |month| { :conditions => ["EXTRACT(MONTH FROM recorded_on) = ?", month] }}
named_scope :by_year, lambda { |year| { :conditions => ["EXTRACT(YEAR FROM recorded_on) = ?", year] }}

我正在生产环境中运行PostgreSQL，但是我正在使用SQLite3进行开发.我该如何以与数据库无关的方式编写这些行?

I'm running PostgreSQL in production, but I'm developing with SQLite3. How can I write those lines in a way that is database-agnostic?

顺便说一句，"recorded_on"是由以下内容组成的:

Btw, "recorded_on" is formed from the following:

Model.recorded_on = Time.parse("Fri, 01 May 2009 08:42:23 -0400")

推荐答案

好吧，发现有更好的方法(感谢

Okay, found out there's a better way (thanks to this article):

基本上在模型中什么都不做！

Basically do nothing in the model!

date = Date.new(year, month, 1)
Model.find(:all, :conditions => { :recorded_on => date..date.end_of_month })

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