What is the best way to update a field within a MongoDB document based on a specified duration?

In the process of creating a new application with JS, Node.JS, Express, and MongoDB, I am implementing a feature where users can purchase listings. These listings are stored as documents in a MongoDB database. My goal is to have the listings automatically "expire" after a specific period of time, such as 30 days. One approach I am considering is adding a boolean field named "expired" to the document that starts as false but switches to true once the expiration time elapses. Is there a way to use JavaScript to associate a timer with each listing and then update the database accordingly when the timer runs out?

javascriptmongodb

Answer №1

To automatically delete documents after a specific time, you need to implement a TTL index. This Time To Live index will manage when the document should be removed from the database.

Here is an example of how to create a TTL index:

user.createIndexes({ "createdAt": 1 }, { expireAfterSeconds: 86400 })

In this case, 'user' represents the schema and 'createdAt' specifies the field that determines when the document will expire.

You have the option to create the index either through the nodejs driver or directly in the mongo shell for the collection.

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