belongs_to :panel
belongs_to :resource_picture
- validates :panel_id, :presence => true, :numericality => true, :existence => true
+ validates :panel_id, :numericality => {:allow_blank => true}
validates :link, :length => {:maximum => 200}
validates :x, :presence => true, :numericality => true
validates :y, :presence => true, :numericality => true