I've got an student_id column in my Attendance table. The ID is found by searching with the student's IDN in the before_create method: class Attendance < ActiveRecord::Base belongs_to :student validates_numericality_of :student_id, :only_integer => true def before_create self.student = Student.find_by_idn(student_id) end end This works just fine as long as the IDN that is entered is actually in the Student table. If it is not, I get an error stating student_id is NULL. How would I display "Student IDN not found" as an error message in my view? I'm new to programming and tried this but it does not work: def before_create s = Student.find_by_idn(student_id) if s = nil errors.add(:student_id, "is not a valid IDN") else self.student = s end end end Anyone have suggestions? Thanks for any help.
on 2007-01-02 09:35