How can I set value for __id field in mongo db using flask-MongoEngine? here is my code
db = MongoEngine(app)
class Book(db.Document):
id = db.IntField(required = True)
title = db.StringField(required = True)
author = db.StringField(required = True)
def Create_record(title:str,author:str):
book = Book()
book.id = "123"
book.title = title
book.author = author
book.save()
The easiest is to rely on the auto-generated id's from MongoDB (ObjectID) which encapsulates a timestamp so it's quite handy. If you don't specify any primary key field in your model, MongoEngine adds id behind the scenes.
This would be defined as:
class Book(Document):
title = StringField()
book = Book(title='foo')
book.save()
Which is equivalent to
class Book(Document):
id = ObjectIdField(default=bson.ObjectId, primary_key=True)
title = StringField()
book = Book(title='foo') # MongoEngine takes care of the id
book.save()
If for some reason you want an auto-increment integer, instead of an object id, you can achieve this easily with MongoEngine's SequenceField:
class Book(Document):
id = SequenceField(primary_key=True)
title = StringField()
book = Book(title='foo') # MongoEngine takes care of the id
book.save()
Or, if you really want to manage the primary key yourself, then you can do it with
class Book(Document):
id = IntField(primary_key=True)
title = StringField()
author = StringField()
book = Book(id=123, title='foo')
book.save()
What was missing in your example was the primary_key=True in the field definition
