You can include a newly calculated attribute obtained from a raw query into the serializer by first defining the attribute in the serializer as a serializer field. Then, you can override the to_representation
method of your serializer to set the value of the attribute.
Here's an example:
# define the new attribute field in your serializer
class MySerializer(serializers.ModelSerializer):
my_attribute = serializers.IntegerField(read_only=True)
class Meta:
model = MyModel
fields = ['id', 'name', 'my_attribute']
# override the to_representation method to set the value of the attribute
def to_representation(self, instance):
# get the value of the attribute from the raw query
my_attribute_value = instance.my_raw_query_result
# set the value of the attribute in the representation
representation = super().to_representation(instance)
representation['my_attribute'] = my_attribute_value
return representation
In this example, my_attribute
is defined as an IntegerField
and marked as read_only
to indicate that it is a calculated value that is not to be included in any request data. The to_representation
method is then overridden to get the value of the attribute from the raw query and set it in the serializer representation that is returned to the client.
Asked: 2023-05-23 18:37:35 +0000
Seen: 16 times
Last updated: May 23 '23