Extend taggable-mixin to support different Tag models.
Usage is pretty simple. Tag model is default in Taggable constructor but you
can call it with different model like GHOPTaskType that inherits from Tag model.
Both Taggable and Tag models have been updated and they don't use hardcoded Tag
model anymore and instead use cls of class methods or self.__class__. In case
of Taggable it's self.__tag_model.
"""
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'
"""}