Chapter 2: User-Facing Backend - Ticket: Paging

I’ve implemented the paging code inside the getMoviesByGenre method, but, when I update the status page, I do not get the exercise code. The pagination works fine and the test (testPagingByGenre) is ok. I don’t know what might be wrong, maybe I have some difficulty in understanding, because, I know almost nothing of the English language.
Here is my code:

public List getMoviesByGenre(String sortKey, int limit, int skip, String… genres) {
// query filter
Bson castFilter =“genres”, genres);
// sort key
Bson sort = Sorts.descending(sortKey);
List movies = new ArrayList<>();

MongoCursor cursor = moviesCollection.find()

while (cursor.hasNext()){

return movies;


I appreciate any help, thank you.

Do you have any error messages when you try the status page?

The only error is: “Paging: Did not receive the proper response when paging by cast”

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Hi @Tarcisio_de_Paulo_Rosa_51215,

You might want to re-arrange the stages for find query. You may find the documentation useful:

Let me know if it does not work.


I followed his suggestion and proceeded to analyze the results step-by-step when I discovered that the ordering in the “getMoviesByCast” function was ascending. I changed to descending and everything worked fine.:grinning:
Thank you very much for your attention and your help.:pray:

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