adding the controller code to be able to get a specific version of a node, way or relation. Add some node checks on update. Some code indentation cleanup.

app/controllers/old_node_controller.rb

@@ -22,4 +22,19 @@ class OldNodeController < ApplicationController
       render :nothing => true, :status => :internal_server_error
     end
   end
+  
+  def version
+    begin
+      old_node = OldNode.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
+
+      doc = OSM::API.new.get_xml_doc
+      doc.root << old_node.to_xml_node
+
+      render :text => doc.to_s, :content_type => "text/xml"
+    rescue ActiveRecord::RecordNotFound
+      render :nothing => true, :status => :not_found
+    rescue
+      render :nothing => true, :status => :internal_server_error
+    end
+  end
 end

app/controllers/old_relation_controller.rb

@@ -2,6 +2,7 @@ class OldRelationController < ApplicationController
   require 'xml/libxml'
 
   session :off
+  before_filter :check_read_availability
   after_filter :compress_output
 
   def history
@@ -20,4 +21,19 @@ class OldRelationController < ApplicationController
       render :nothing => true, :status => :internal_server_error
     end
   end
+  
+  def version
+    begin
+      old_relation = OldRelation.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
+
+      doc = OSM::API.new.get_xml_doc
+      doc.root << old_relation.to_xml_node
+
+      render :text => doc.to_s, :content_type => "text/xml"
+    rescue ActiveRecord::RecordNotFound
+      render :nothing => true, :status => :not_found
+    rescue
+      render :nothing => true, :status => :internetal_service_error
+    end
+  end
 end

app/controllers/old_way_controller.rb

@@ -22,4 +22,19 @@ class OldWayController < ApplicationController
       render :nothing => true, :status => :internal_server_error
     end
   end
+  
+  def version
+    begin
+      old_way = OldWay.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
+      
+      doc = OSM::API.new.get_xml_doc
+      doc.root << old_way.to_xml_node
+      
+      render :text => doc.to_s, :content_type => "text/xml"
+    rescue ActiveRecord::RecordNotFound
+      render :nothing => true, :status => :not_found
+    rescue
+      render :nothing => true, :status => :internal_server_error
+    end
+  end
 end

app/controllers/relation_controller.rb

@@ -46,6 +46,7 @@ class RelationController < ApplicationController
   end
 
   def update
+    logger.debug request.raw_post
     begin
       relation = Relation.find(params[:id])
       new_relation = Relation.from_xml(request.raw_post)

app/models/node.rb

@@ -134,13 +134,13 @@ class Node < ActiveRecord::Base
   def delete_with_history(user)
     if self.visible
       if WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", :conditions => [ "current_ways.visible = 1 AND current_way_nodes.node_id = ?", self.id ])
-	raise OSM::APIPreconditionFailedError.new
+        raise OSM::APIPreconditionFailedError.new
       elsif RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = 1 AND member_type='node' and member_id=?", self.id])
-	raise OSM::APIPreconditionFailedError.new
+        raise OSM::APIPreconditionFailedError.new
       else
-	self.user_id = user.id
-	self.visible = 0
-	save_with_history!
+        self.user_id = user.id
+        self.visible = 0
+        save_with_history!
       end
     else
       raise OSM::APIAlreadyDeletedError.new
@@ -150,10 +150,14 @@ class Node < ActiveRecord::Base
   def update_from(new_node, user)
     if new_node.version != version
       raise OSM::APIVersionMismatchError.new(new_node.version, version)
+    elsif new_node.changeset.user_id != user.id
+      raise OSM::APIUserChangesetMismatchError.new
+    elsif not new_node.changeset.open?
+      raise OSM::APIChangesetAlreadyClosedError.new
     end
 
     # FIXME logic need looked at
-    self.changeset_id = user.id
+    self.changeset_id = new_node.changeset_id
     self.latitude = new_node.latitude 
     self.longitude = new_node.longitude
     self.tags = new_node.tags
@@ -196,7 +200,6 @@ class Node < ActiveRecord::Base
 
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
-    el1['version'] = self.version.to_s
     return el1
   end
 

app/models/relation.rb

@@ -246,7 +246,7 @@ class Relation < ActiveRecord::Base
     else
       # FIXME need to deal with changeset etc
       #self.user_id = user.id
-      self.changeset = new_relation.changeset
+      self.changeset_id = new_relation.changeset_id
       self.tags = new_relation.tags
       self.members = new_relation.members
       self.visible = true

lib/osm.rb

@@ -57,7 +57,7 @@ module OSM
 
     def render_opts
       { :text => "Version mismatch: Provided " + provided.to_s +
-	", server had: " + latest.to_s, :status => :bad_request }
+      ", server had: " + latest.to_s, :status => :conflict }
     end
   end