Mongoose : How to remove item from array by value

Question

Is there a method to remove an item from an array with Mongoose? I have an array inside object like this:

"students": [ "5ad72254452996029415e49f", "5adaeb388acfc414d428820b" ]

And I'd like to remove one of them by identified value. This is my code :

Company.findById(id_company, function(err, company) {
  var students = company.students; //students array
  // ...
  // ...
  // ...
});

Students is an array, and I'd like to update and remove one of array element inside it by ID.

Do you want to persist your changes into the database or you just want to alter the array in memory? — Tsvetan Ganev, Apr 24 '18 at 07:40
Please check this stack question : https://stackoverflow.com/questions/3954438/how-to-remove-item-from-array-by-value — NSK, Apr 24 '18 at 07:44
If I'm using .splice, it remove all of array element, what I want is just remove specific element by ID. — Fatih, Apr 24 '18 at 07:45
you'd probably be doing it in wrong way. How are you doing it ? and as @TsvetanGanev mentioned, do you want to persist it in your db ? — Muhammad Usman, Apr 24 '18 at 07:47

Eduardo Yáñez Parareda · Accepted Answer · 2018-04-24T07:52:10.043

Yes, you must do a $pull on your array attribute:

const deleteStudentStatement = {
    $pull: {students: studentId}
};

Then do an update, for example:

return Company.findOneAndUpdate({ _id: companyId }, 
                                deleteStudentStatement, 
                                { new: true })
                     .then((company) => {
                           },
                           (err) => {
                           }
                     );

Mongoose : How to remove item from array by value

1 Answers1