django tests, mongoengine, and unique_with constraint

Hi everybody,

I'm facing the following problem with Mongodb.

I've got the following model : 

from mongoengine import Document, StringField, DateTimeField

class Author(Document):

    name = StringField(max_length=50, required=True)

    first_name = StringField(max_length=50, required=True, unique_with='name')

    birthday = DateTimeField(default=None)

    death_day = DateTimeField(default=None)

    meta = {

        'indexes': [('name', '+first_name')]

    }

Nothing special there, except that 'firstname' should be unique with 'name'.

I wrote the following test suite :

from django.test import TestCase

from les_classiques.models import Author

import mongoengine

class DatabaseTest(TestCase):

    def setUp(self):

        db = mongoengine.connection.get_db()

        for collection in db.collection_names(include_system_collections=False):

            db.drop_collection(collection)

    def test_insert_new_author(self):

        author = Author(name='Hugo', first_name='Victor')

        author.save()

        db_author = Author.objects(name='Hugo', first_name='Victor')[0]

        self.assertEqual(db_author.name, 'Hugo')

    def test_insert_duplicate_author_failure(self):

        author = Author(name='Peguy', first_name='Charles')

        author2 = Author(name='Peguy', first_name='Charles')

        author.save()

        self.assertRaises(mongoengine.NotUniqueError, author2.save)

The second test fails with the following error : "AssertionError: NotUniqueError not raised by save"

It's very strange. After some tests, I realized that the objects of the second function, are created with a duplicate key :

> db.author.find()

{ "_id" : ObjectId("530c96b7893e2808f8435e49"), "name" : "Peguy", "first_name" : "Charles" }

{ "_id" : ObjectId("530c96b7893e2808f8435e4a"), "name" : "Peguy", "first_name" : "Charles" }

I read the docs, this should work. StringField inherits from BaseField and should accept unique_with parameter.

Any idea ?

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