django - 如果此 RECORD 不存在，则保存它？

Question

模型.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 views.py 中

#......
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 '

我试过的更多

# 避免名称冲突(仅用于名称字段而不用于记录)

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。如果表中不存在记录，我想保存它。任何人都可以帮助我在这里尝试什么？
谢谢

Answer 1

Django 有一个方便的方法 get_or_create(defaults=None, **kwargs)

get_or_create

A convenience method for looking up an object with the given kwargs (may be empty if your model has defaults for all fields), creating one if necessary.

Returns a tuple of (object, created), where object is the retrieved or created object and created is a boolean specifying whether a new object was created.

你是这个意思吗？