Serialization of parent model including child models

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I have models - Commodity, Clother and child models, as Acessories, Outwear, etc.:

class Commodity(models.Model):
    atribute = models.CharField()

class Clother(models.Model):
    commodity = models.ForeignKey(Commodity)
    clother_atribute = models.CharField()

class Acessories(models.Model):
    clother = models.ForeignKey(Clother)
    acessories_atribute = models.CharField() 

class Outwear(models.Model):
    clother = models.ForeignKey(Clother)
    outwear_atribute = models.CharField()

How can I serialize parent model Commodity to call all vertical dependencies. I suppose to query Commodity id and get all Clother attributes and Acessories or Outwear attributes. Thanks!

If I understood your problem you can define ClotherSerializer. You can use depth = 1 to serialize nested objects in this serializer:

class ClotherSerializer(serializers.ModelSerializer):
    class Meta:
        model = Clother
        fields = ('id', 'acessories_set', 'outwear_set')
        depth = 1

Later in your CommoditySerializer you can use ClotherSerializer to serialize clother and all it's relation:

class CommoditySerializer(serializers.ModelSerializer):
    clother_set = ClotherSerializer(many=True)
    class Meta:
        model = Commodity
        fields = ('id', 'clother_set')

django - Serialization of parent model including child models, ForeignKey(Clother) outwear_atribute = models.CharField(). How can I serialize parent model Commodity to call all vertical dependencies. Parent involvement in education: models, strategies and contexts Shawn Moore, Sue Lasky In this paper, we explore the conceptual, empirical and strategic literature related to parent involvement in education. Parent involvement in schooling has traditionally taken many forms including parents helping their children with

You can use the drf-writable-nested [GitHub] package for that and specify in a serializer how to serialize certain fields. By using another serializer, you thus specify that it it serialized by calling the serializer for these children:

class CommoditySerializer(WritableNestedModelSerializer):
    clother_set = ClotherSerializer(many=True)

    class Meta:
        model = Commodity
        fields = ("atribute", 'clother_set')


class ClotherSerializer(WritableNestedModelSerializer):

    class Meta:
        model = Clother
        fields = ("clother_atribute",)

Of course you can add more such relations, for example to specify Acessories for a Clother.

I advice you look at the GitHub page, and use this as a template for your own serializer.

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Alternatively, this can also be achieved using SerializerMethodField: http://www.django-rest-framework.org/api-guide/fields/#serializermethodfield

class ClotherSerializer(serializers.ModelSerializer):
    """
    Serializer for Clother data model.
    """
    acessories = serializers.SerializerMethodField()
    outwears = serializers.SerializerMethodField()

    class Meta:
        model = Clother
        fields = ('id', 'acessories', 'outwears')

    def get_acessories(self, clother):
        return AcessoriesSerializer(clother.acessories_set.all(), many=True).data

    def get_outwears(self, clother):
        return OutwearSerializer(clother.outwear_set.all(), many=True).data


class CommoditySerializer(serializers.ModelSerializer):
    """
    Serializer for Commodity data model.
    """
    clother = serializers.SerializerMethodField()

    class Meta:
        model = Commodity
        fields = ('id', 'clother')

    def get_clother(self, commodity):
        return ClotherSerializer(commodity.clother_set.all(), many=True).data

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Comments
  • Do you use the Django serializers?
  • I use Django REST Framework model serializers.
  • Well since there is no concept in Django like "vertical dependencies", you probably have to list those yourself. Yes, you can walk through the model-relation graph, but detecting cycles make things complicated.
  • Thanks, well noted. Hoped to meet something like this.
  • @D.Make You are welcome. You can try to use depth=2 in commodityserializer directly. But I afraid it will not work for reverse relation.