Retrospring/app/models/question.rb

class Question < ActiveRecord::Base
  belongs_to :user
  has_many :answers

  validates :content, length: { maximum: 255 }

  class << self
    def can_be_removed
      return false if self.answers.count > 0
      return false if Inbox.where(question: self).count > 0
      self.user.decrement! :asked_count
      true
    end
  end
end