Bug: Cannot resolve field "id"

[binhetech]

Describe the bug
A clear and concise description of what the bug is.

i want to use 'user_id' as the primary key for mongoengine ORM, but when i click the [edit] button from the author admin view, it shows:
mongoengine.errors.InvalidQueryError: Cannot resolve field "id"
so, is the 'id' name the only one ? could i use annother name, such as 'user_id' as the primary key?

To Reproduce
Explain how to reproduce the bug.

class Author(db.Document):
meta = {
'collection': 'author_profile'
}
user_id = db.StringField(min_length=3)
name = db.StringField(min_length=3)
description= db.StringField(max_length=20)

class AuthorView(ModelView):
pk_attr = "user_id"
fields = [
"name",
StringField('description')
]

Environment (please complete the following information):

• Starlette-Admin version: [0.4.0]
• ORM/ODMs: [MongoEngine]

Additional context
Add any other context about the problem here.