[Django]-Django Rest Framework Serializer Relations: How to get list of all child objects in parent's serializer?

by

24👍

✅

I think your problem is you forgot to add a related_name for your Children model. I would have the models like this:

class Parent(models.Model):
    name = models.CharField(max_length=50)

class Child(models.Model):
    parent = models.ForeignKey(Parent, related_name='children')  # <--- Add related_name
    child_name = models.CharField(max_length=80)

And I think with this change you will solve the error your getting

👤AlvaroAV

15👍

You can implement this in two way:

  1. With SerializerMethodField :
    your code became like this:

    class ParentSerializer(serializers.ModelSerializer):

     children_list = serializers.SerializerMethodField('_get_children')

     def _get_children(self, obj):
         serializer = ChildSerializer(obj.child_list(), many=True)
         return serializer.data

    class Meta:
        model = Course
        fields = ('url','id','name','children_list')

  2. Every field could be attribute of model or a method, so you can define a get_children_list method in Parent model, then call it in list of fields of ParentSerializer:

    class ParentSerializer(serializers.ModelSerializer):

    class Meta:
         model = Course
         fields = ('url','id','name','get_children_list')

Note: You need to inherits from serializers.ModelSerializer in this scenario

👤Moe Far

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