What is the best way to add logic to delete() on Grails domain class?

Question

I need to make changes to other domain classes when an instance of a particular domain class is deleted. What is the best way to do this? I don't want to wait until commit or flush so I don't think the "beforeDelete" callback will help. I would like to "override" delete, do some stuff and call super.delete():

class Foo {
    Bar bar
    void delete() {
        if (bar) bar.foo = null
        super.delete() -- this doesn't work
    }
}

Currently I have named "delete" cancel but would like to call it "delete" but then I cannot call the original delete().

I would use beforeDelete and implement my logic there. – sbglasius Sep 28 '11 at 07:20 — sbglasius, Sep 28 '11 at 07:20

score 5 · Answer 1 · answered Sep 28 '11 at 07:46

5

To add to what @sbglasius said, here's the link to the docs on GORM events

Complete example:

class Foo {
    Bar bar

    def beforeDelete() {
        if(bar) {
            bar.foo = null
        }
    }
}

answered Sep 28 '11 at 07:46

OverZealous

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From what I understand beforeDelete is only called on flush? I need my model to be consistent before flush. – David Tinker Sep 29 '11 at 08:49

score 1 · Accepted Answer · edited May 23 '17 at 12:27

1

I haven't tried overriding GORM methods myself, but this might give some insight on what's involved:

"Overloading" standard GORM CRUD methods

I would put the "delete" logic in a service and call that instead:

class FooService {

    def deleteInstance(foo) {
        if (foo?.bar) {
            foo.bar.foo = null
            // might have to call foo.bar.save() here
            // then foo.bar = null
        }
        foo.delete()
    }

}

edited May 23 '17 at 12:27

Community

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answered Sep 29 '11 at 20:36

R. Valbuena

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This is equivalent to adding a cancel to the domain class but the overloading link is good. Thanks. – David Tinker Sep 30 '11 at 09:31

What is the best way to add logic to delete() on Grails domain class?

2 Answers2