你如何在不同的grails控制器中分享常见的方法? [英] How do you share common methods in different grails controllers?
问题描述
当前,当我需要在不同控制器之间共享像 processParams(params)
这样的方法时,我使用继承或服务。
这两个解决方案都有一些不便:
- 使用继承,您不能使用多重继承,这意味着您需要拥有所有的控制器实用方法集中在一个地方此外,在开发模式下,Grails中没有检测到基本控制器类中的任何代码更改的错误(您需要重新启动应用程序)。
- 使用服务,您没有访问所有注入的属性,如params,session,flush ...
所以我的问题是:还有其他方式可以使用常见的方法可以访问多个控制器吗?
我喜欢的一种选择是将常用方法编写为一个类别,然后将其混合必要的控制器。它比继承提供了更多的灵活性,可以访问像params这样的东西,代码简单易懂。
这是一个小例子:
@Category(Object)
class MyControllerCategory {
def printParams(){
println params
}
@Mixin(MyControllerCategory)
类SomethingController {
def create = {
printParams()
.. 。
}
def save = {
printParams()
}
}
Currently when I need to share a method like processParams(params)
between different controllers, I use either inheritance or services.
Both solution has some inconvenients :
- With inheritance, you cannot use multiple inheritance which means that you need to have all of your controller utility methods in one place. And also, there is a bug in grails that does not detect any code changes in Base Controller classes in development mode (you need to restart the app)
- With services, you don't have access to all injected properties like params, session, flush...
So my question is : is there any other way to use some common methods accessible for multiple controllers ?
One option I like is to write the common methods as a category, then mix it into the controllers as necessary. It gives a lot more flexibility than inheritance, has access to stuff like params, and the code is simple and understandable.
Here's a tiny example:
@Category(Object)
class MyControllerCategory {
def printParams() {
println params
}
}
@Mixin(MyControllerCategory)
class SomethingController {
def create = {
printParams()
...
}
def save = {
printParams()
}
}
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