DJANGO DRF, Serialize related models

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DJANGO DRF, Serialize related models

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#1 by (2 votes)

1

My problem is this:

In my app I have the following models inside the 'models.py'

class Carrera(models.Model):
     nombre = models.CharField(max_length=50)

class Materia(models.Model):
     nombre = models.CharField(max_length=50)
     nivel = models.PositiveIntegerField()
     carrera = models.ForeignKey(Carrera)

The serilizers.py

class Carrera_Serializer(serializers.ModelSerializer):
    class Meta:
        model = Carrera
        fields = ('id', 'nombre')

class Materia_Serializer(serializers.ModelSerializer):
     class Meta:
        model =  Materia
        fields = ('nombre', 'nivel', 'carrera')

The urls are:

router = routers.DefaultRouter()
router.register(r'plan/mat', api.Materia_ViewSet)
router.register(r'plan/car', api.Carrera_ViewSet)

urlpatterns = [
    url(r'^', include(router.urls)),
    ]

The JSON shown when entering link is as follows:

        {
        "nombre": "Ing Civil I",
        "nivel": 1,
        "carrera": 1
        },

And I would like you to show:

{
"nombre": "Ing Civil I",
"nivel": 1,
"carrera": {"nombre": "Ing Civil"
            "url": "http://localhost:8000/plan/car/1/"
           }
},

django djangorestframework

asked by Jorge Ernesto RONCONI 11.10.2018 в 17:10

source

1 answer

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS How to customize the order of the results in MYSQL

score 2 · Accepted Answer

Change the model in the following way:

class Materia(models.Model):
     nombre = models.CharField(max_length=50)
     nivel = models.PositiveIntegerField()
     carrera = models.ForeignKey(Carrera,related_name='carrera')

with related_name we make the kind of JOIN in Materia_Serializer 1

class Materia_Serializer(serializers.ModelSerializer):
 carrera = Carrera_Serializer(source='carrera', read_only=True)
 class Meta:
    model =  Materia
    fields = ('nombre', 'nivel', 'carrera')