Thursday, March 24, 2011

manually set id of grails domain object

Problem:
if you create a new domain object and set its id in the constructor like this:
Cat catman = new Cat(id:1000, name: "catman", kind: "domestic short haired")
later, if you look at the object the id will be null. what gives?!


Solution:
Its madness, but it works to assign the id after the object is made. Just add
catman.setId(1000);
and you are in business.

Note: if you want to save the object into db after doing this, you must set the id generator to 'assigned'

4 comments:

  1. That's just poor coding on their part.

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  2. Yeah poor coding on their part... Like you would have coded it better.

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  3. Actually, no id is set after

    Cat catman = new Cat(id:1000, name: "catman", kind: "domestic short haired")

    because you didn't call the save() method.

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  4. @unknown:
    you are right of course. I dont remember my exact need for having an id before saving the object, but there was a need to have it be present in the object before the save.

    I was just surprised that cat.setId(1000) would cause the id to be present in the object while doing new Cat(id: 1000) would not.

    ReplyDelete