belongs_to :license_group
belongs_to :system_picture
has_many :resource_pictures
validates :license_group_id, :presence => true, :numericality => true, :existence => {:both => false}
belongs_to :license_group
belongs_to :system_picture
has_many :resource_pictures
validates :license_group_id, :presence => true, :numericality => true, :existence => {:both => false}