accepts_nested_attributes_for :balloons
accepts_nested_attributes_for :speeches
- validates :panel_id, :presence => true, :numericality => true, :existence => true
+ validates :panel_id, :numericality => {:allow_blank => true}
validates :speech_balloon_template_id, :presence => true, :numericality => true, :existence => true
validates :classname, :presence => true, :length => {:maximum => 50}
validates :z, :presence => true, :numericality => {:greater_than => 0}