Stored objects are always returned as (None)

[nicolaischneider]

One line description of the issue

When I store any object in my database and retrieve it again afterwards it's always returned as (None). However, when I check out the actual database using MonoDB Compass I can see all objects the way I saved them.

My Script:
OS = MacOS 11.0.1
Python==3.8.2
Django==3.0.5
djongo==1.3.3
pymongo==3.11.2
MongoDB 4.4 Community Edition

# database setting
DATABASES = {
    'default': {
        'ENGINE': 'djongo',
        'NAME': 'martini',
        'ENFORCE_SCHEMA': False,
        'LOGGING': {
            'version': 1,
            'loggers': {
                'djongo': {
                    'level': 'DEBUG',
                    'propagate': False,                        
                }
            },    
        },
    }
}

# my model
class Transaction(models.Model):
    transaction_type = models.CharField(max_length=10,default="")
    traded_player_id = models.CharField(max_length=10,default="")
    traded_player_name = models.CharField(max_length=30,default="")
    value = models.IntegerField(default=-1)

# storing the model
transaction = Transaction(
    transaction_type="SALE",
    traded_player_id="2839",
    traded_player_name="Grill",
    value=499700
)
transaction.save()

Issue

Checking out the shell in-code or using django's shell I receive the following result:

>>>Transaction.objects.filter()
<QuerySet [<Transaction: Transaction object (None)>, <Transaction: Transaction object (None)>, <Transaction: Transaction object (None)>]>

However when I take a look at the database in MongoDB Compass: