JSON from django rest Framework

Question

I'm making a API with django rest framework, but the JSON has the the categoria's id of categoria model, the foreignkey, I want show the categoria's name equals the model's id

class Establecimiento(models.Model):
    nombre= models.CharField(max_length = 140)
    categoria = models.ForeignKey(Categoria)
    ciudad = models.ForeignKey(Ciudad)
    def __unicode__(self):
        return self.nombre


class Categoria(models.Model):
    titulo = models.CharField(max_length = 140)

I have a file serializers.py a views.py whit ViewSet

class EstablecimientoSerializer(serializers.ModelSerializer):
#    establecimiento = Establecimineto.objects.values('categoira__titulo')
    class Meta:
        model = Establecimiento.objects.select_related('categoria')
#      model = Establecimiento
        fields = ('nombre','categoria',)

#

class EstablecimientoViewSet(viewsets.ModelViewSet):
#    queryset = Establecimiento.objects.all()
    queryset = Establecimiento.objects.values('nombre','categoria__titulo')
    serializer_class = EstablecimientoSerializer

Then when I make the query in the views.py the JSON result only show the fields null where I should make the query for that the JSON resulting not show id the Foreignkey

Answer 1

This is how your serializer should be defined:

class EstablecimientoSerializer(serializers.ModelSerializer):
    categoria = serializers.RelatedField()

    class Meta:
        model = Establecimiento
        depth = 1
        fields = ('nombre', 'categoria',)

and the viewset:

class EstablecimientoViewSet(viewsets.ModelViewSet):
    queryset = Establecimiento.objects.only('nombre','categoria',)
    serializer_class = EstablecimientoSerializer

This assumes that you have defined __unicode__ method for Categoria:

class Categoria(models.Model):
    # fields..

    def __unicode__(self):
        return self.titulo

If you don't want to define __unicode__, you can instead of RelatedField use the SlugRelatedField field:

categoria = serializers.SlugRelatedField(read_only=True, slug_field='titulo')