Nested Serializer in Django Rest Framework - django

Question

I am trying to make a nested serializer but when I run the following code it gives me an empty list. I tried to replicate the solution of this question and my problem is exactly similar
The only difference is in that answer serializer.Serializer is used but I am using Model Serializer
class hhhSerializer(serializers.Modelserializer):
id = serializers.IntegerField(read_only=True)
name = serializers.CharField(read_only=True)
class Meta:
model = ItemBatch
fields = ('id','name')
class dispatchhistorySerializer(serializers.ModelSerializer):
truck_name = ReadOnlyField(source='truck_name.name')
truck_type = ReadOnlyField(source='truck_type.name')
items = hhhSerializer(many=True)
class Meta:
model = DispatchPlan
fields = "__all__"
Output:
"id": 35,
"truck_name": "24 ft mxl 14 Ton",
"truck_type": "Container",
"items": [
{},
{},
{},
{},
{},
{},
{},
{},
{},
{}
],

Answer 1

You have to declare the field explicitly at DispatchHistorySerializer.Meta.fields; now, as personal recommendation avoid always "all" in the field list
This code should work (I had renamed your classes to comform python convention)
class HhhSerializer(serializers.Serializer):
id = serializers.IntegerField(read_only=True)
name = serializers.CharField(read_only=True)
class Meta:
model = ItemBatch
fields = ('id','name')
class DispatchHistorySerializer(serializers.ModelSerializer):
truck_name = ReadOnlyField(source='truck_name.name')
truck_type = ReadOnlyField(source='truck_type.name')
items = HhhSerializer(many=True) # 2) here we say how to serialize 'items'
class Meta:
model = DispatchPlan
fields = ('id', 'truck_name', 'truck_type', 'items',) # 1) here we say: include 'items' please
EDIT: if using ModelSerializer, define which model in the Meta class; if it isn't a ModelSerializer, use a simple Serializer instead