def verify_policy(opts)
      result = policy.constantize.call(opts)
    rescue NameError
      result = true
    ensure
      return result
    end
def verify_policy(opts)
      result = policy.constantize.call(opts)
    rescue NameError
      result = true
    ensure
      return result
    end
Private: checks the mapper policy against its class

 opts - The Hash containing the policy filter data.

 Return: true if it fulfills the policy and false if it does not.