Let me see if I got this right:
The model name is "student" and the attribute is called
"student_number".
When a new student is created you want to make sure the student number
has not been taken already, and if so, set it to the current maximum
student number + 1.
I cant make much sense of the code you posted but you could put the code
for it in a filter on the student model:
before_create(:check_student_number)
private
def check_student_number
if(Student.find_by_student_number(self.student_number))
self.student_number = Student.maximum(:student_number) + 1
end
def
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