1
我想知道如何使用through-models
在Django
中工作,以便能夠使屬性更舒適。我知道如何使用這個models
獲得一些屬性,但它不直觀,而且很難記住如何獲取它們。如何在Django中使用直通模式訪問屬性?
例如在我的情況:
class UserProfile(models.Model):
user = models.OneToOneField(User, related_name='userprofile')
is_translator = models.BooleanField(default=False)
languages = models.ManyToManyField(Language, through='UserProfileLanguage')
def __unicode__(self):
return '{} {}'.format(self.user.first_name, self.user.last_name)
def __str__(self):
return '{} {}'.format(self.user.first_name, self.user.last_name)
class Language(models.Model):
shortcut = models.CharField(max_length=40)
name = models.CharField(max_length=40)
def __str__(self):
return self.name
class Level(models.Model):
LEVEL_CHOICES = (
('unknown','Unknown'),
('standard','Standard level'),
('professional','Professional level'),
('native','Native speaker level'),
)
name = models.CharField(max_length=40,choices=LEVEL_CHOICES, blank=False, null=False)
price_multiplier = models.FloatField()
def __str__(self):
return self.get_name_display()
class UserProfileLanguage(models.Model):
userprofile = models.ForeignKey(UserProfile)
language = models.ForeignKey(Language)
level = models.ForeignKey(Level)
class Meta:
unique_together = (('userprofile', 'language'),)
因此,舉例來說,當我想知道一個User
是否知道一個語言A
,我必須這樣做:
print A in user.userprofile.userprofilelanguage_set.all()
有沒有更簡單的方法?當我嘗試print
例如user.userprofile.languages
返回SolutionsForLanguagesApp.Language.None