i am having a problem with the combobox component.
i have a mysql database with a student and a class table.
i want to make a registration form for the student. i have the combobox here where he
picks his class (populated from the class table). The class_id is a foreign key to the student table and
it's invisible in the combobox. i want when the students registers from his selection on the combobox
to write in the database the corresponding class_id.
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