关于Django 框架的ContentType 模型

ContentType 模型对应数据库中django_content_type表，主要用户维护 django project 中所安装的所有用户模型

代码如下：

class ContentType(models.Model):

　　 #这三个字段分别表示 模型的用户化名称，模型所属app名称，模型名称
name = models.CharField(max_length=100,verbose_name=_('name'))
app_label = models.CharField(max_length=100)
model = models.CharField(_('python model class name'), max_length=100)
objects = ContentTypeManager()　　#自定义Mananger类

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)

转载于:https://www.cnblogs.com/johan/archive/2011/04/20/2022478.html