Question

I am having that problem when I update my konkurrencer the do_foobar is called. The problem is that the konkurrancer have no ratings. And I get a off course a ZeroDivisionerror.

What is the best solution to solve this kind of problem?

My model:

before_update :do_foobar
def do_foobar
  self.rating = (rating_score/ratings)
end

Answer 1

self.rating = (ratings == 0) ? nil : rating_score/ratings

or

self.rating = rating_score/ratings rescue nil