app/models/wbs_activity_ratio_profile.rb
class WbsActivityRatioProfile < ActiveRecord::Base
attr_accessible :organization_profile_id, :ratio_value, :wbs_activity_ratio_element_id
belongs_to :wbs_activity_ratio_element
belongs_to :organization_profile
#Amoeba##validates :wbs_activity_ratio_element_id, :organization_profile_id, :presence => true
validates :ratio_value, :numericality => { :allow_blank => true }
end