Grails - 自动将自定义字段（列）添加到所有域对象 [英] Grails - adding custom fields (columns) to all domain objects - automatically

问题描述

默认情况下，当您创建域类时，它会自动为所有域类（表）添加id和version列。如果我想添加一个专栏，例如isChecked，并且这应该被自动添加到所有的域类（即表），类似id和version列的添加方式。我怎样才能做到这一点，如果我不想为某个特定领域类使用isChecked，我也应该可以做到这一点。

By default when you create a domain class, it will automatically add "id" and "version" column for all the domain classes (tables). What if I want to add a column say for e.g. "isChecked" and this should be added automatically to all the domain classes (i.e tables) similar way "id" and "version" columns are added. How can I achieve this and also if I don't want to have "isChecked" for a specific domain class, I should also be able to do that.

我在Grail 1.3.7中这样做？

How can I do this in Grail 1.3.7?

谢谢。
Jay Chandran

Thank You. Jay Chandran

编辑：我可以获得更多输入吗？建议的解答不起作用！

Can I get more inputs? Suggested answers did not work!

推荐答案

您可以使用Groovy为这类事物提供的元编程魔术，然而，我可能只是走一条更典型的路线并使用继承。创建一个包含isChecked（以及其他任何您需要的）的父域，并让您的域名需要它们扩展该类。

You could use the meta programming magic that Groovy provides for this sort of thing, however, I would probably just go a more typical route and use inheritance. Create a parent domain that contains isChecked (and anything else you need) and have your domains that require them extend that class.

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