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Hello everyone. I am having a bit of a problem

updating values of a firebase DB. I am registering new students. studentId is a key which contains an object with the student name and other details. It is a unique identifier. However the data that I am sending is only updating the key values eg the studentName and leaving out the studentId which is a key. How do I update a JSON Key in firebase? All the code and results is here..
https://hastebin.com/ameqohetuf.php

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Move the id as field and let firebase assign a key for each record

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