X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/013ef53c97a1d2c8319f1ac624e8325a06828366..7151fa05e4d4f73956d7f9a7ad2db1f5b956a0c0:/app/models/relation.rb

diff --git a/app/models/relation.rb b/app/models/relation.rb
index 58add6dd0..984732c71 100644
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -31,6 +31,8 @@ class Relation < ActiveRecord::Base
       relation.id = pt['id'].to_i
     end
 
+    relation.version = pt['version']
+
     if create
       relation.timestamp = Time.now
       relation.visible = true
@@ -222,6 +224,8 @@ class Relation < ActiveRecord::Base
   def update_from(new_relation, user)
     if !new_relation.preconditions_ok?
       raise OSM::APIPreconditionFailedError.new
+    elsif new_relation.version != version
+      raise OSM::APIVersionMismatchError.new(new_relation.version, version)
     else
       self.user_id = user.id
       self.tags = new_relation.tags