Mongoose return only one property of the document and not the entire document

问题

Mongoose provides us lot of methods (findOne, find, findByID, etc.) to find document(s). All these methods return the entire document(s)/model.

Is it possible that when I search for a document, I just return single property from the document/model instead of returning entire document?

回答1:

Yes, by setting the projection object, which is usually specified right after the criteria object.

MyModel.find({criteria: 'some criteria'}, {'fieldToInclude': 1, '_id': 0})
                                          ^ Projection object

Note: _id is always included by default, so the only it's exclusion needs to be specified if needed.

来源：https://stackoverflow.com/questions/31650258/mongoose-return-only-one-property-of-the-document-and-not-the-entire-document