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When returning Mongoose documents from a MongoDB database, you can't just edit the returned document. You either need to convert it to a plain JavaScript object by the .toObject() function - which has yet to work for me - or JSON.parse(JSON.stringify(doc)) it.
My question is why is this the case? Why aren't they just returned as plain, simple, easy to use JavaScript objects by default?
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To turn a Mongoose document into a plain object, we can use the lean method. MyModel. findOne(). lean().
The _doc property is where Mongoose stores the "raw" value of the document. A document itself has getters/setters, the $__ property, etc.
Because Mongoose documents have additional functionality, like various built-in and custom instance methods. It allows you to call document.save(...) after changing a document, for instance.
If you want your queries to return plain objects, you can also use the lean option.
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