I have made a simple database with some books and some authors. Now I want to update the author-objects with new info. But nothing is happening in the database.

In my DB the ratingsAverage‘s type is Number. I want to implement filtering functionality depending on the ratings. For example, if the user selects 4, the result will be the ratings that fall within the range of 4 to 4.9. Selecting other ratings is possible too.

in my DB the ratingsAverage‘s type is Number.
I want to implement filtering functionality depending on the ratings. for example, if the user selects 4, the result will be the ratings fall within the range of 4 to 4.9. selecting other ratings is possible too.

Working on a large project. Several dozen collections, 1 million users a day, 10,000+ db transactions a second.

Working on a large project. Several dozen collections, 1 million users a day, 10,000+ db transactions a second.

I am trying to query my DB on a collection but I have some field that I would like to change from an array of objects to a single object that have been picked up randomly from the array. is this possible to do this in a query?

Are there limitations to how much mongodb can scale when it comes to querying millions of documents.

I have a mongodb collection named students, where there are 3 documents:

I am creating a student management system. I am using nodejs, expressjs, ejs and mongoose.
Here is the code for Student model:

I am creating a student management system. I am using nodejs, expressjs, ejs and mongoose.