How to work with async code in Mongoose virtual properties?

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You can define a virtual method, for which you can define a callback.

Using your example:

TransactionSchema.method('getNotebook', function(cb) {
  Notebook.findById(this.notebookId, function(err, notebook) {
    cb(notebook);
  })
});

And while the sole commenter appears to be one of those pedantic types, you also should not be afraid of embedding documents. Its one of mongos strong points from what I understand.

One uses the above code like so:

instance.getNotebook(function(nootebook){
    // hey man, I have my notebook and stuff
});

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