Make sure we get the list of tags and segments to save before we do the

corresponding delete, as otherwise we might not have read them from the
database yet.

app/models/way.rb

@@ -149,9 +149,11 @@ class Way < ActiveRecord::Base
         self.timestamp = t
         self.save!
 
+        tags = self.tags
+
         WayTag.delete_all(['id = ?', self.id])
 
-        self.tags.each do |k,v|
+        tags.each do |k,v|
           tag = WayTag.new
           tag.k = k
           tag.v = v
@@ -159,10 +161,12 @@ class Way < ActiveRecord::Base
           tag.save!
         end
 
+        segs = self.segs
+
         WaySegment.delete_all(['id = ?', self.id])
 
         i = 0
-        self.segs.each do |n|
+        segs.each do |n|
           seg = WaySegment.new
           seg.id = self.id
           seg.segment_id = n