41 lines
1.0 KiB
Python
41 lines
1.0 KiB
Python
"""
|
|
22. Using properties on models
|
|
|
|
Use properties on models just like on any other Python object.
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
class Person(models.Model):
|
|
first_name = models.CharField(maxlength=30)
|
|
last_name = models.CharField(maxlength=30)
|
|
|
|
def _get_full_name(self):
|
|
return "%s %s" % (self.first_name, self.last_name)
|
|
|
|
def _set_full_name(self, combined_name):
|
|
self.first_name, self.last_name = combined_name.split(' ', 1)
|
|
|
|
full_name = property(_get_full_name)
|
|
|
|
full_name_2 = property(_get_full_name, _set_full_name)
|
|
|
|
__test__ = {'API_TESTS':"""
|
|
>>> a = Person(first_name='John', last_name='Lennon')
|
|
>>> a.save()
|
|
>>> a.full_name
|
|
'John Lennon'
|
|
|
|
# The "full_name" property hasn't provided a "set" method.
|
|
>>> a.full_name = 'Paul McCartney'
|
|
Traceback (most recent call last):
|
|
...
|
|
AttributeError: can't set attribute
|
|
|
|
# But "full_name_2" has, and it can be used to initialise the class.
|
|
>>> a2 = Person(full_name_2 = 'Paul McCartney')
|
|
>>> a2.save()
|
|
>>> a2.first_name
|
|
'Paul'
|
|
"""}
|