more way bits

app/models/way.rb

@@ -2,6 +2,10 @@ class Way < ActiveRecord::Base
   require 'xml/libxml'
   
   belongs_to :user
+
+  has_many :way_segments, :foreign_key => 'id'
+  has_many :way_tags, :foreign_key => 'id'
+
   set_table_name 'current_ways'
 
   def self.from_xml(xml, create=false)
@@ -32,13 +36,43 @@ class Way < ActiveRecord::Base
       pt.find('seg').each do |seg|
         way.add_seg_num(seg['id'])
       end
- 
 
     end
 
     return way
   end
 
+  def to_xml
+    doc = XML::Document.new
+    doc.encoding = 'UTF-8' 
+    root = XML::Node.new 'osm'
+    root['version'] = '0.4'
+    root['generator'] = 'OpenStreetMap server'
+
+    doc.root = root
+    
+    el1 = XML::Node.new 'way'
+    el1['id'] = self.id.to_s
+    el1['visible'] = self.visible.to_s
+    el1['timestamp'] = self.timestamp.xmlschema
+    
+    self.way_segments.each do |seg| # FIXME need to make sure they come back in the right order
+      e = XML::Node.new 'seg'
+      e['id'] = seg.segment_id.to_s
+      el1 << e
+    end
+ 
+    self.way_tags.each do |tag|
+      e = XML::Node.new 'tag'
+      e['k'] = tag.k
+      e['v'] = tag.v
+      el1 << e
+    end
+  
+    root << el1
+    return doc
+  end
+
   def segs
     @segs = Array.new unless @segs
     @segs
@@ -74,6 +108,18 @@ class Way < ActiveRecord::Base
       tag.save
     end
 
+    WaySegment.delete_all(['id = ?', self.id])
+    
+    i = 0
+    self.segs.each do |n|
+      seg = WaySegment.new
+      seg.id = self.id
+      seg.segment_id = n
+      seg.sequence_id = i
+      seg.save
+      i += 1
+    end
+
     old_way = OldWay.from_way(self)
     old_way.save
   end

app/models/way_segment.rb

@@ -0,0 +1,3 @@
+class WaySegment < ActiveRecord::Base
+  set_table_name 'current_way_segments'
+end