How can I add validation to my models? I tried to use @before_insert and
@before_update as follows, but it didn't work as I expected.
class Link(Entity):
url = Field(Unicode)
...
@before_insert
@before_update
def validate(self):
if not is_valid_url(self.url):
return False
return True
But it seems the object is saved regardless of the return value. How is
this normally accomplished?
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