使用MongoEngine Document类方法进行自定义验证和预保存挂钩
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我目前正在探索MongoEngine“对象文档映射器”的可能性。目前尚不清楚的是，我可以在多大程度上将验证和对象创建逻辑移到Document对象本身。
我的印象是这应该不是问题，但是我没有找到很多有关问题的例子/建议/最佳实践。
自定义验证函数，将自动在save（）上调用以评估字段内容是否有效；
根据字段内容的哈希值，自动在save（）上生成标识符；
我认为我需要重写save（）方法，以便可以调用自定义逻辑，但是缺少示例使我相信这可能是错误的方法...
欢迎使用mongoEngine提供任何示例或对高质量代码库的引用。
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3 个回复
蓄荣糖些
。 如果发现要向所有模型添加验证钩子，则可以考虑创建自定义子类，例如：class MyDocument(mongoengine.Document): def save(self, *args, **kwargs): for hook in self._pre_save_hooks: # the callable can raise an exception if # it determines that it is inappropriate # to save this instance; or it can modify # the instance before it is saved hook(self): super(MyDocument, self).save(*args, **kwargs)class SomeModel(MyDocument): # fields... _pre_save_hooks = [ some_callable, another_callable ]掀辟髓观粟
方法来完成自定义验证。class Essay(Document): status = StringField(choices=(\'Published\', \'Draft\'), required=True) pub_date = DateTimeField() def clean(self): \"\"\" Ensures that only published essays have a `pub_date` and automatically sets the pub_date if published and not set. \"\"\" if self.status == \'Draft\' and self.pub_date is not None: msg = \'Draft entries should not have a publication date.\' raise ValidationError(msg) # Set the pub_date for published items if not set. if self.status == \'Published\' and self.pub_date is None: self.pub_date = datetime.now()，因为它是从调用的。珊畴炮贩号
class MyDoc(Document): def validate(self): errors = {} try: super(MyDoc, self).validate() except ValidationError as e: errors = e.errors # Your custom validation here... # Unfortunately this might swallow any other errors on \'myfield\' if self.something_is_wrong(): errors[\'myfield\'] = ValidationError(\"this field is wrong!\", field_name=\'myfield\') if errors: raise ValidationError(\'ValidationError\', errors=errors)