- has_many :tags, :class_name => "Tracetag", :foreign_key => "gpx_id", :dependent => :delete_all
- has_many :points, :class_name => "Tracepoint", :foreign_key => "gpx_id", :dependent => :delete_all
+ has_many :tags, :class_name => "Tracetag", :foreign_key => "gpx_id", :dependent => :delete_all, :inverse_of => :trace
+ has_many :points, :class_name => "Tracepoint", :foreign_key => "gpx_id", :dependent => :delete_all, :inverse_of => :trace