class Membership < ActiveRecord::Base

  belongs_to :group
  belongs_to :user

  validate_on_create :external_membership?,
    :if => lambda {|membership| membership.group.private?}

  attr_accessor :username,
    :password

 private

  def external_membership?
    request = PrivateGroupApi::Request.new group.api
    request.username = username
    request.password = password
    request.on_failure do
      errors.add_to_base "You do not have an account with this group's web site"
    end
    request.on_error do
      errors.add_to_base 'There was a problem when trying to authenticate your account'
    end
    request.authenticate
  end

end