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Home/ Questions/Q 6124927
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T16:11:21+00:00 2026-05-23T16:11:21+00:00

Suppose I have a class with following definition: class ClassA { static belongsTo =

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Suppose I have a class with following definition:

class ClassA { 
    static belongsTo = [ownerB:ClassB, ownerC:ClassC]
}

How I can enforce an unique constraint on above “belongsTo” relationship?

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  1. Editorial Team
    Editorial Team
    2026-05-23T16:11:22+00:00Added an answer on May 23, 2026 at 4:11 pm

    Using the Map form of belongsTo creates fields with those names, so you can do it with

    static constraints = {
       ownerB unique: 'ownerC'
    }
    
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