content_type = ContentType.objects.get_for_model(Map)
maps = maps.extra(select=SortedDict([
('member_count', MEMBER_COUNT_SQL),
('topic_count', TOPIC_COUNT_SQL),
]), select_params=(content_type.id,))
and the ContentType is:
class ContentType(models.Model):
name = models.CharField(max_length=100)
app_label = models.CharField(max_length=100)
model = models.CharField(_('python model class name'), max_length=100)
objects = ContentTypeManager()
class Meta:
verbose_name = _('content type')
verbose_name_plural = _('content types')
db_table = 'django_content_type'
ordering = ('name',)
unique_together = (('app_label', 'model'),)
def __unicode__(self):
return self.name
def model_class(self):
"Returns the Python model class for this type of content."
from django.db import models
return models.get_model(self.app_label, self.model)
def get_object_for_this_type(self, **kwargs):
"""
Returns an object of this type for the keyword arguments given.
Basically, this is a proxy around this object_type's get_object() model
method. The ObjectNotExist exception, if thrown, will not be caught,
so code that calls this method should catch it.
"""
return self.model_class()._default_manager.using(self._state.db).get(**kwargs)
def natural_key(self):
return (self.app_label, self.model)
i want to know: what is the 'content_type' used for ??
