[Django]-Set serializer field from data value having different names (Custom field Mapping for ModelSerizer)

You can explicitly define type field inside serializer, and use source argument to map it to msg_type field:

class TruRouteRequestSerializer(serializers.ModelSerializer):
    type = serializers.CharField(source='msg_type')

    class Meta:
        model = TruRouteRequest
        fields = ['type', ...]