Minor fixes needed for generic key name
We no longer try to retreive an entity when there are unset fields.
This sort of makes 'getIfFields' obsolete, since we check if fields
now anyway. This is needed because getKeyFieldsFromDict expects the
fields to be set.
Also a minor fix in a Django template so that the generic 'edit' page
has a working delete button again.
"""
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'
"""}