MongoEngine is a powerful Object-Document Mapping (ODM) library for working with MongoDB in Python. In this blog post, we will focus on how to delete documents using MongoEngine’s intuitive API.

To get started, make sure you have MongoEngine installed. You can install it using pip:

pip install mongoengine

Now, let’s consider a scenario where we have a User collection in our MongoDB database, and we want to delete a specific document from it.

First, let’s define a User model using MongoEngine:

from mongoengine import Document, StringField, IntField

class User(Document):
    name = StringField()
    age = IntField()

Now, let’s assume we want to delete a user with the name “John”. To do this, we can use the delete() method provided by MongoEngine:

User.objects(name="John").delete()

In the above code, User.objects(name="John") performs a query to find the user with the name “John”. The delete() method deletes all the documents that match the query.

We can also use other query operators to filter the documents we want to delete. For example, if we want to delete users whose age is greater than 30, we can use the gt operator:

User.objects(age__gt=30).delete()

In this query, age__gt=30 selects all documents where the age field is greater than 30.

If we want to delete only a single document, we can use the first() method to retrieve the first document that matches our query and then call the delete() method on it:

user = User.objects(name="John").first()
if user:
    user.delete()

In the above code, we check if the user exists before calling the delete() method. This is useful to handle cases where no document matches the query.

MongoEngine also provides the remove() method, which can be used to remove multiple documents at once:

User.objects.remove()

The remove() method deletes all documents in the collection, effectively emptying it.

Remember to always be cautious when executing delete or remove operations, as they can permanently delete data from the database.

In this blog post, we have learned how to delete documents using MongoEngine in Python. We explored different ways to delete documents based on specific criteria and saw how to delete a single document or multiple documents at once. Stay tuned for more blog posts on MongoEngine functionality!