Selective deep rendering of hasMany relationships in grails

Question

For the following domain model:

class Route {
    String  name
    static  hasMany     = [checkPoints:CheckPoint]  
    static  belongsTo   = [someBigObject:         


        

Answer 1

You can register your own JSON marshaller for chosen classes and return properties which you want to render. Map can be done automatically by iteration over class fields. Marshaller ca be registered for example in bootstrap or in domain class during creation.

JSON.registerObjectMarshaller(Route) {
    return [name:it.name, checkPoints:it.checkPoints]
}

There is nice article about it under: http://manbuildswebsite.com/2010/02/15/rendering-json-in-grails-part-3-customise-your-json-with-object-marshallers/

Hope it helps