Binding combobox to a inner object

[larini]

Hi, this is my json from server:

[
  {
    "consulta_id": 23752, 
    "convenio_id": 1, 
    "data": "2012-07-11", 
    "id": 36569, 
    "paciente": {
      "nome": "Alvasole", 
      "id": 12
    }, 
    "tipo": 1
  }, 
  {
    "consulta_id": 23753, 
    "convenio_id": 61, 
    "data": "2012-07-11", 
	"id": 36579,
    "paciente": {
      "nome": "Felintoi", 
      "id": 33
    }, 
    "tipo": 1
  }
]

I need to bind the combobox to the field: paciente.id and paciente.nome, respectively to valueField and displayField.

This combo will only have 1 record on its store.

I get this work in this way:

    this.getForm().loadRecord(rec);
    combo.store = Ext.create('Ext.data.Store', {
            fields: ['id', 'nome'],
            data : [
                rec.get('paciente')
            ]
        });

But i think that may have a better way.