Question

EDITED:

I trying to refactore this:

self.before_create do |obj|
  obj.position = self.class.count
end

to this:

self.before_create :set_position

private

def set_position
  obj.position = self.class.count
end

But, Its displaying Error:

 undefined local variable or method `obj'

How fix this?

Answer 1

class YourClass < AR

  before_create :set_position

  private

  def set_position
    self.position = @@count
  end
end

The set_position method is instance method, so self is assigned to the instance. The count I believe should be a class variable.