Count

[Aída Betzabeth Dávila Sotelo]

Hi!

I have the following issue. I need to do a count of registered users per day in 
my application.
I have the correct query, but I cannot display the results on screen.

I tried with different types of data, at the end I put a simple list of string 
but sends me the following error, instead of information:

??? EntityModel objectAdapter oid: null

Could you recommend me another way that I can solve
this problem? or how could I get the count of some object by date?.

Thanks in advance.
Aida Davila

This is my code:



public List<String> FindNewUsersCountPerDay() {

    System.out.println("Find");
    List <User> MyUsers = this.findAllUsers();

    List<String> lista = new ArrayList<String>();

    Map<String, Long> countByDate  = MyUsers.stream()
            .collect(Collectors
                            .groupingBy(User::getCreationDate, 
Collectors.counting())
                     );

    Set<Map.Entry<String, Long>> set = countByDate.entrySet();
    List<Map.Entry<String, Long>> userList = new ArrayList<>(set);
    Iterator<Map.Entry<String, Long>> it = userList.iterator();

    int index = 0;

    while (it.hasNext()) {
        Map.Entry<String, Long> entry = it.next();
        String result = index + " " + entry.getKey() + " " + entry.getValue();
        lista.add(result);
        System.out.println("Entry from converted list : " + index + " 1:" +  
entry.getKey() + " 2:" + entry.getValue());
        index++;
    }

    System.out.println(countByDate);

    return (lista);
}