MongoDB find（）仅从集合中检索一个属性

Question

I have a collection of blog posts where the structure of the records is {title, author, contents} and I want to retrieve all the names of all the authors I am doing this:

this.db.collection("ContentText").find("authors");

but my output is undefined Can someone point out the error?

Answer 1

尝试这个：

this.db.collection("ContentText").distinct("author");

Answer 2

Try this:

this.db.collection('<collection_name>').find(<queryObject>,{author:1});

This query will return you array of authors with _id, you can exclude _id by

{_id:0,author:1}

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