From 9189093997610a8f289037d37b683c9fed060ae1 Mon Sep 17 00:00:00 2001
From: Steve Coast <steve@asklater.com>
Date: Wed, 13 Dec 2006 16:05:37 +0000
Subject: [PATCH] precondition stuff

---
 app/controllers/segment_controller.rb |  8 ++++----
 app/controllers/way_controller.rb     |  9 ++++++++-
 app/models/segment.rb                 |  6 +++++-
 app/models/way.rb                     | 10 ++++++++++
 4 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/app/controllers/segment_controller.rb b/app/controllers/segment_controller.rb
index 7e77609f3..5f2603f0b 100644
--- a/app/controllers/segment_controller.rb
+++ b/app/controllers/segment_controller.rb
@@ -13,11 +13,11 @@ class SegmentController < ApplicationController
         
         segment.user_id = @user.id
 
-        a = Node.find(segment.node_a.to_i)
-        b = Node.find(segment.node_b.to_i)
+        segment.from_node = Node.find(segment.node_a.to_i)
+        segment.to_node = Node.find(segment.node_b.to_i)
         
-        unless a and a.visible and b and b.visible  
-          render :nothing => true, :status => 400
+        unless segment.precondtions_ok? # are the nodes visible?
+          render :nothing => true, :status => 412
         end
 
         if segment.save_with_history
diff --git a/app/controllers/way_controller.rb b/app/controllers/way_controller.rb
index a2d215760..ec8f31003 100644
--- a/app/controllers/way_controller.rb
+++ b/app/controllers/way_controller.rb
@@ -10,10 +10,17 @@ class WayController < ApplicationController
 
       if way
         way.user_id = @user.id
+        unless way.precondtions_ok? # are the segments (and their nodes) visible?
+          render :nothing => true, :status => 412
+          return
+        end
+
         if way.save_with_history
           render :text => way.id
+          return
         else
           render :nothing => true, :status => 500
+          return
         end
         return
       else
@@ -33,7 +40,7 @@ class WayController < ApplicationController
 
     way = Way.find(params[:id])
     case request.method
-   
+
     when :get
       unless way.visible
         render :nothing => true, :status => 410
diff --git a/app/models/segment.rb b/app/models/segment.rb
index ddfc3db03..774517e2c 100644
--- a/app/models/segment.rb
+++ b/app/models/segment.rb
@@ -4,11 +4,12 @@ class Segment < ActiveRecord::Base
 
   validates_numericality_of :node_a
   validates_numericality_of :node_b
-  # FIXME validate a nd b exist and are visible
 
   has_many :old_segments, :foreign_key => :id
   belongs_to :user
 
+  has_one :from_node, :class => 'Node', :foreign_key => 'node_a'
+  has_one :to_node, :class => 'Node', :foreign_key => 'node_b'
 
   def self.from_xml(xml, create=false)
     p = XML::Parser.new
@@ -102,5 +103,8 @@ class Segment < ActiveRecord::Base
     end
   end
 
+  def precondtions_ok?
+    return from_node and from_node.visible and to_node and to_node.visible
+  end
 
 end
diff --git a/app/models/way.rb b/app/models/way.rb
index 43bd4d8c3..55a578acd 100644
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -139,4 +139,14 @@ class Way < ActiveRecord::Base
     old_way.save_with_dependencies
   end
 
+  def preconditions_ok?
+    self.segs.each do |n|
+      segment = Segment.find(n)
+      unless segment and segment.visible and segment.preconditions_ok?
+        return false
+      end
+    end
+    return true
+  end
+
 end
-- 
2.39.5