Using Django Check Constraints to Limit A Model to a Single Instance

Using Django Check Constraints to Limit A Model to a Single Instance

Using Django Check Constraints to Limit A Model to a Single Instance. Yet another use case for creating a database constraint with Django’s CheckConstraint class. Sometimes it’s useful to have a model with only have one instance in the database...

Using Django Check Constraints to Limit A Model to a Single Instance. Yet another use case for creating a database constraint with Django’s CheckConstraint class. Sometimes it’s useful to have a model with only have one instance in the database, sometimes known as a singleton. This is useful for storing a small amount of structured data that we want to share between all our project’s processes.

For example, imagine a remote API that we authenticate with using a temporary access token. We have the username and password for the API in our Django settings, and use those to get a temporary access token. We then need to store that temporary access token for all operations with that API, and refresh it when it nears its expiry time. And for security reasons, we are only allowed to store the current access token.

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