The class will not work for a rjs call.. html class elements are not
unique by design so that is not a good idea anywho...
Here is a good description for div_for
http://apidock.com/rails/ActionView/Helpers/RecordTagHelper/div_for
It's just a way to create a div that has something todo with the
record that you have. So if you have a @user object with id of 1 you
would get id="user_1" for the div.
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