Cascade style delete in Mongoose

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This is one of the primary use cases of Mongoose’s 'remove' middleware.

clientSchema.pre('remove', function(next) {
    // 'this' is the client being removed. Provide callbacks here if you want
    // to be notified of the calls' result.
    Sweepstakes.remove({client_id: this._id}).exec();
    Submission.remove({client_id: this._id}).exec();
    next();
});

This way, when you call client.remove() this middleware is automatically invoked to clean up dependencies.

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