how-to persist JSON into Grails domain objects with nested members

Question

Given these domain classes:

class Person {
    Long id
    String name

    static hasMany = [aliases: PersonAlias]
}

class PersonAlias {
    Person person
    Long id
    String name
}

I try to do a straight-forward round trip load/save through JSON land:

Person p = Person.get(20005353);
def json = p as JSON
def str = json as String
def map = JSON.parse(str)
p.properties = map
p.save(flush:true)

which produces this JSON

{
  "id": 20005353,
  "name": "John Smith",
  "class": "Person",
  "aliases":
  [
    {
      "class": "PersonAlias",
      "id": 99,
      "name": "J. Smith"
    }
  ]
}

And fails with this error:

grails.validation.ValidationErrors: 1 errors Field error in object 'heavymeta.Person' on field 'aliases': rejected value [[]]; codes [typeMismatch.heavymeta.Person.aliases,typeMismatch.aliases,typeMismatch.java.util.Set,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [heavymeta.Person.aliases,aliases]; arguments []; default message [aliases]]; default message [Failed to convert property value of type 'org.codehaus.groovy.grails.web.json.JSONArray' to required type 'java.util.Set' for property 'aliases'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.util.LinkedHashMap] to required type [heavymeta.PersonAlias] for property 'aliases[0]': no matching editors or conversion strategy found]

Why does this fail, and is there a way to make it work?

Mr. Cat · Accepted Answer · 2012-08-08 19:51:28Z

1

I can give you a little suggestion (=. Check params in debug mode in update action(if you haven't generated views and controller for domain class run in console generate-all Person). Take a look to params.aliases you'll find it as list of ids. Try the same.

answered Aug 8, 2012 at 19:51

Mr. Cat

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