小编Ign*_*icz的帖子

我的models.py:

USER_TYPES = (                                                                                                                                                                   
    ('D', 'Demo'   ),                                                                                                                                                               
    ('F', 'Free'   ),
    ('P', 'Premium'),                                                                                                                                                        
)                                                                                                                                                                                                                                                                                                                                                                

class BaseProfile(models.Model):                                                                                                                                                 
    user      = models.OneToOneField(User, primary_key=True)                                                                                                                     
    user_type = models.CharField(max_length=1, blank=True, choices=USER_TYPES)                                                                                                           

class DemoProfile(models.Model):                                                                                                                                                 
    user      = models.OneToOneField(User, primary_key=True)                                                                                                                     
    demo      = models.CharField(max_length=10, blank=True) 
    ...

class FreeProfile(models.Model):                                                                                                                                                 
    user      = models.OneToOneField(User, primary_key=True)                                                                                                                     
    free      = models.CharField(max_length=10, blank=True) 
    ...

class PremiumProfile(models.Model):                                                                                                                                                 
    user      = models.OneToOneField(User, primary_key=True)                                                                                                                     
    premium    = models.CharField(max_length=10, blank=True) 
    ...

class ProxyProfile(BaseProfile):                                                                                                                                                 
    class Meta:                                                                                                                                                                  
        proxy = True             
    def get_profile(self):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
        if self.user_type == 'D':                                                                                                                                              
            return DemoProfile._default_manager.get(user__id__exact=self.user_id)                                                                                              
        elif self.user_type == 'F':                                                                                                                                            
            return FreeProfile._default_manager.get(user__id__exact=self.user_id)                                                                                              
        else:                                                                                                                                                                  
            return …