grails：测试域类中的“排序”映射 [英] grails: testing 'sort' mapping in a domain class

问题描述

以 grails doc 为例：

  class Airport {
 ... 
 static hasMany = [flights：Flight] 
 static mapping = {
航班sort：'number'，order：'desc'
} 
} 
  

如何测试排序？

解决方案

正如文档中所述，它不会像写入一样工作。您必须将 static belongsTo = [airport：Airport] 添加到Flight。

如果没有belongsTo，会出现以下错误：

关联[Airport-> flights]的默认排序不受单向一对多关系支持。

使用belongsTo，测试可能如下所示：

  class SortSpec extends IntegrationSpec {
 deftest grails does sort flights （）{
给定：
 def airport = new Airport（）
 airport.addToFlights（new flight（number：A））
 airport.addToFlights（new Flight （新号码：B））
 airport.save（failOnError：true，flush：true）
 
 ：
 def sortedAirport = airport.refresh（）//从数据库重新加载以应用排序
 
然后：
 sortedAirport.flights.collect {it.number} == ['C '，'B'，'A'] 
} 
} 
  

但是，编写这样的测试没有多大意义，因为它会检查grails应用排序配置。我为什么要测试Grails？测试你的代码而不是框架。

Given the example from grails doc:

class Airport {
    …
    static hasMany = [flights: Flight]
    static mapping = {
        flights sort: 'number', order: 'desc'
    }
}

How can one test sorting?

解决方案

As stated in the docs, it does not work like written. You have to add static belongsTo = [airport:Airport] to Flight.

Without belongsTo you get the following error:

Default sort for associations [Airport->flights] are not supported with unidirectional one to many relationships.

With belongsTo the test could look like this:

class SortSpec extends IntegrationSpec {
    def "test grails does sort flights" () {
        given:
        def airport = new Airport()
        airport.addToFlights (new Flight (number: "A"))
        airport.addToFlights (new Flight (number: "C"))
        airport.addToFlights (new Flight (number: "B"))
        airport.save (failOnError: true, flush:true)

        when:
        def sortedAirport = airport.refresh() // reload from db to apply sorting

        then:
        sortedAirport.flights.collect { it.number } == ['C', 'B', 'A']
    }
}

But.. it doesn't make much sense to write a test like this because it checks that grails applies the sorting configuration. Why would I want to test grails? Test your code and not the framework.

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