You need to set the associations between models
After that, it could look like this:
@students = @user.students.all
where @user = current_user
I guess.
Edit:
To make it failsafe:
@students = @user.students.all if @user
To avoid later problems set user only when its not set by the controller e.g in a user view:
@user ||= current_user
This only sets @user to current_user when it’s not already set.
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solved Display the details of only current user who is logged in? [closed]