Rails 测试具有日期范围的 named_scope [英] Rails Testing a named_scope with a date range

问题描述

场景
我在名为last_week"的模型上有一个 named_scope.它所做的只是获取上周的记录.

SCENARIO
I have a named_scope on a model called 'last_week'. All it does is it fetches the records from last week.

我想对此进行测试，我的方法是测试返回的结果是否在一定范围内.我不知道这是否是在类方法上测试此功能的正确方法.

I want to test this and my approach is to test that the results coming back are within a certain range. I don't know if this is the right way of testing this functionality on a class method.

我不能使用 RSpec、Shoulda 或其他 3rd 方客户端插件.我只被允许使用摩卡咖啡.

I can't use RSpec, Shoulda or other 3rd party client plugin. I am only allowed to use Mocha if I want.

# Model

class Article < ActiveRecord::Base

  scope :last_week,   :conditions => { :created_at => 1.week.ago..DateTime.now.end_of_day }

end


#Test

class ArticleTest < ActiveSupport::TestCase

  test "named scope :last_week " do
    last_week_range = DateTime.now.end_of_day.to_i - 1.week.ago.to_i
    assert_in_delta last_week_range, Article.last_week.first.created_at - Article.last_week.last.created_at,  last_week_range
  end

end

寻求有关此方法对与错的反馈.

Looking for feedback on what's right or wrong about this approach.

推荐答案

首先你的范围是错误的:因为代码是即时执行的，你的日期范围条件将取决于你启动服务器的时间...

First your scope is wrong: because code is executed on the fly your date range condition will depend on the time you booted your server...

替换为:

scope :last_week,  lambda { :conditions => { :created_at => 1.week.ago..DateTime.now.end_of_day } }

其次，为了测试，我会创建一些记录并检查范围是否正确:

Second, to test, I'd create some records and check if the scope get the proper ones:

• 创建工厂

• create a factory

创建两条记录

设置 created_at 1 周 + 1 天前为一条记录

set created_at 1 week + 1 day ago for one record

检查你的范围只检索一个(正确的)

check your scope only retrieves one (the proper one)

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