Grails(19)instanceOf in Grails

最新推荐文章于 2025-08-11 09:58:34 发布

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本文深入探讨了Groovy编程语言中instanceOf方法的使用与优势，通过实例解析其在不同场景下的应用，包括如何在TenantUtils类中进行基于ID的实例判断，以及如何在循环遍历容器对象时进行类型区分。了解instanceOf在Groovy世界中的应用，对于提升代码的灵活性和效率至关重要。

Grails(19)instanceOf in Grails
This function will only work in integration test case. This method is based on the GORM.

@Test
publicvoid testInstanceOf(){
DatabaseObject databaseObject = new DatabaseObject()
assertTrue !(databaseObjectinstanceof DatabaseObject2 )
assertTrue "asdfasdf"instanceof String
TenantUtils.doWithTenant(brand.idas Integer) {
assertTrue !(event.instanceOf(DatabaseObject2.class))
}
assertTrue true
}

What is the advantage of instanceOf than instanceof.

class Container {
static hasMany = [children: Child]
}

class Child {
String name
static belongsTo = [container: Container]
}

class Thing extends Child {}

class Other extends Child {}

def container = Container.get(id)
for (child in container.children) {
if(child.instanceOf(Thing)){
// thing
}
else if(child.instanceOf(Other)){
// other
}
}

It is good to learn that in groovy world.

References:
http://www.grails.org/doc/1.3.7/ref/Domain%20Classes/instanceOf.html