如果此记录不存在,是否保存?

型号.py

#.....
class FilterSave(models.Model):
   def __unicode__(self):
       return "%s" % (self.name)
   name = models.CharField(max_length=50)
   customer_type = models.CharField(max_length=20)
   tag = models.CharField(max_length=10)

在我的视野里

#......
def save_filter(self, filter_name, keyword_filter):
        dict_json = eval(json.dumps(keyword_filter))
        filter_saves = FilterSave.objects.all()
        # Avoid record that already exist
        filter_save = FilterSave(name=filter_name,  customer_type=dict_json["customer_type"], tag=dict_json["tag"])

       # I am trying ....
       for fs in filter_saves:
          if fs.name != filter_name:#just check for a field name
            filter_save.save()
          else:
            print 'already exist '

我尝试了更多

#避免名称冲突(仅用于名称字段,不用于记录)

filter_save = FilterSave(name=filter_name, customer_type=dict_json["customer_type"], tag=dict_json["tag"])
exists = FilterSave.objects.filter(name=filter_name)
if not exists:
    filter_save.save()

我的问题在这里。如果表中没有记录,我想保存一个记录。有人能帮我做我想做的吗? 谢谢