def __get__(self, instance, owner=None):
"""
Tag getter. Returns an instance's tags if accessed on an instance, and
all of a model's tags if called on a class. That is, this model::
class Link(models.Model):
...
tags = TagField()
Lets you do both of these::
>>> l = Link.objects.get(...)
>>> l.tags
'tag1 tag2 tag3'
>>> Link.tags
'tag1 tag2 tag3 tag4'
"""
# Handle access on the model (i.e. Link.tags)
if instance is None:
return edit_string_for_tags(Tag.objects.usage_for_model(owner))
tags = self._get_instance_tag_cache(instance)
if tags is None:
if instance.pk is None:
self._set_instance_tag_cache(instance, '')
else:
self._set_instance_tag_cache(
instance, edit_string_for_tags(Tag.objects.get_for_object(instance)))
return self._get_instance_tag_cache(instance)
def test_recreation_of_tag_list_string_representations(self):
plain = Tag.objects.create(name="plain")
spaces = Tag.objects.create(name="spa ces")
comma = Tag.objects.create(name="com,ma")
self.assertEquals(edit_string_for_tags([plain]), u"plain")
self.assertEquals(edit_string_for_tags([plain, spaces]), u"plain, spa ces")
self.assertEquals(edit_string_for_tags([plain, spaces, comma]), u'plain, spa ces, "com,ma"')
self.assertEquals(edit_string_for_tags([plain, comma]), u'plain "com,ma"')
self.assertEquals(edit_string_for_tags([comma, spaces]), u'"com,ma", spa ces')
