How to add variable in Django model

Question

I want to add variable in Django model and I don't want to save it to database at the same time I want to return this variable to user when calling the endpoint.

this is what i found in the web, but the problem is the variable is not rerun to user

class User (models.Model):
   f_name = models.CharField(max_length=255)
   l_name = models.CharField(max_length=300)
   full_name = ''

How to rerun the full_name to user when he call the api ?

Answer 1

If this is using Django Rest Framework, I don't know how your code is set up, but you'll need to extend your serializer:

add a new field to the serializer: full_name = serializers.SerializerMethodField()

add a method to the serializer:

def get_full_name(self, obj):
    return "{} {}".format(obj.first_name, obj.last_name)

NOTE: there are LOTS of different ways of joining those strings together, using @property in your model, fstrings, etc - up to you to choose the most appropriate for your needs (without seeing the rest of your code()

Answer 2

You can define model'sproperty :

class User (models.Model):
   f_name = models.CharField(max_length=255)
   l_name = models.CharField(max_length=300)

   @property
   def full_name(self):
       return self.f_name + self.l_name

now you use full_name same way as normal attribute user.full_name .