Django rest framework - model serializer doesn't serialize all fields - serialization

Question

I'm using Django rest framework 3.7.7
I want to serialize an object instance and then deserialize it (without saving to DB again).
So I created a serializer that inherits from serializers.ModelSerializer.
To this model instance I sometimes add a field within the request that is not part of the model, using property setter. I did add it to the serializer as well, but when serializing - I don't see that field in the serialized data.
This is the model:
class MyModel(models.Model):
manager = models.CharField(max_length=200)
reviewer = models.CharField(max_length=200)
#property
def note(self):
return getattr(self, '_note', None)
#note.setter
def note(self, value):
self._note = value
This is the model serializer:
class MyModelSerializer(serializers.ModelSerializer):
note = serializers.CharField(write_only=True, required=False, max_length=1000, allow_null=True)
class Meta:
model = MyModel
fields = [
'manager',
'reviewer',
'note'
]
This is how I use the serializer:
ser_instance = MyModelSerializer(self.instance)
ser_data = ser_instance.data
seems like the ser_instance.data contains only the model fields data (without the 'note')

Answer 1

From the write_only--[DRF-Doc], it states that
Set this to True to ensure that the field may be used when updating or creating an instance, but is not included when serializing the representation.
Defaults to False
So, if you need to serialize the note field, remove the write_only=true from serializer.
#serializers.py
class MyModelSerializer(serializers.ModelSerializer):
note = serializers.CharField(required=False, max_length=1000, allow_null=True) # removed "write_only=True"
...