unique=True Not working.

[dipankar08]

class User(Document):
#Required
username= StringField(required=True,max_length=10)
email = StringField(required=True,unique=True)
password= StringField(max_length=250,required=True)

u =User('xxx','a@a.com','123')
u.save()
u.save() <-- Not thronging any Exception.

[timjacobi]

Your code does not throw an error because you are saving the same object twice.
class User(Document):
username= StringField(required=True,max_length=10)
email = StringField(required=True,unique=True)
password= StringField(max_length=250,required=True)

u =User('xxx','a@a.com','123')
u.save()
u2 =User('xxx','a@a.com','123')
u2.save()

raise NotUniqueError(message % unicode(err))
mongoengine.errors.NotUniqueError: Tried to save duplicate unique keys (E11000 duplicate key error index: uniquetest.user.$email_1 dup key: { : "a@a.com" })