給用戶的唯一數據庫條目

Question

我有一個模型需要一個listname。我只希望列表名稱禁用每個用戶的重複。目前，用戶不能輸入「配方」兩次，但如果其他用戶沒有「配方」列表名稱，則由於該字段是唯一的，所以無法輸入。是否有可能使列表名僅對當前登錄的用戶唯一？

模型

class newlist(models.Model): 

    user = models.ForeignKey(User) 
    list_name = models.CharField(max_length = 100, unique = True) 
    picture = models.ImageField(upload_to='profiles/', default = "/media/profiles/default.jpg") 
    slug = AutoSlugField(populate_from='list_name', default = '') 

    def __str__(self): 
     return self.list_name 

Answer 1

使用模型Meta類unique_together。你可以找到優秀的文檔here。

class newlist(models.Model): 
    class Meta: 
     unique_together=('user','list_name') 
    user = models.ForeignKey(User) 
    list_name = models.CharField(max_length = 100) 
    picture = models.ImageField(upload_to='profiles/', default = "/media/profiles/default.jpg") 
    slug = AutoSlugField(populate_from='list_name', default = '') 

    def __str__(self): 
     return self.list_name 
    def save(self,*args,**kwargs): 
     try: 
      return super(newlist,self).save(*args,**kwargs) 
     except IntegrityError: # This is raised if the object can't be saved. 
      # Your error handling code 
      from django.core.exceptions import PermissionDenied 
      raise PermissionDenied()