Django model field -- populate_from Option for CharField -

just wan't ask if possible use populate_from option in charfield field prepopulate field other fields, example of slug field.

class post(models.model):     ***name***= models.charfield(max_length=50)     slug = extension_fields.autoslugfield(populate_from='***name***', blank=true)     created = models.datetimefield(auto_now_add=true, editable=false)     last_updated = models.datetimefield(auto_now=true, editable=false) 

let say,

class employee(models.model):     eid= models.charfield(primary_key = true)     lastname = models.charfield(max_length=50)     firstname = models.charfield(max_length=50)     middlename = models.charfield(max_length=50, null=true)  

now wan't add new charfield fullname. wan't fullname populated lastname, firstname , middlename fields.

fullname = models.charfield(populate_from = "***i don't know here***") 

please help...

here's option not require overriding save function:

class employee(models.model):      def get_fullname(self):         return '{} {} {}'.format(self.lastname, self.firstname, self.middlename)      eid= models.charfield(primary_key = true)     lastname = models.charfield(max_length=50)     firstname = models.charfield(max_length=50)     middlename = models.charfield(max_length=50, null=true)      fullname = property(get_fullname) 

this option great if don't need edit fullname separately lastname, firstname , middlename not display field in admin, stores result in database gets value when called