From 329b6faf91745b4b6760d975d8b5574c5ffdb181 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Thu, 30 Apr 2009 23:45:55 +0000
Subject: [PATCH] Use association names with :joins instead of writing the SQL
 for the join by hand.

---
 app/models/node.rb     | 4 ++--
 app/models/relation.rb | 3 ++-
 app/models/way.rb      | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/app/models/node.rb b/app/models/node.rb
index d85b22c9b..a4ba76e91 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -131,11 +131,11 @@ class Node < ActiveRecord::Base
     # shouldn't be possible to get race conditions.
     Node.transaction do
       check_consistency(self, new_node, user)
-      way = WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", 
+      way = WayNode.find(:first, :joins => :way, 
                          :conditions => [ "current_ways.visible = ? AND current_way_nodes.node_id = ?", true, self.id ])
       raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by way #{way.id}.") unless way.nil?
       
-      rel = RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", 
+      rel = RelationMember.find(:first, :joins => :relation, 
                                 :conditions => [ "visible = ? AND member_type='Node' and member_id=? ", true, self.id])
       raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by relation #{rel.relation.id}.") unless rel.nil?
 
diff --git a/app/models/relation.rb b/app/models/relation.rb
index ae9d2f844..09143294c 100644
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -242,7 +242,8 @@ class Relation < ActiveRecord::Base
     Relation.transaction do
       check_consistency(self, new_relation, user)
       # This will check to see if this relation is used by another relation
-      rel = RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='Relation' and member_id=? ", true, self.id ])
+      rel = RelationMember.find(:first, :joins => :relation, 
+                                :conditions => [ "visible = ? AND member_type='Relation' and member_id=? ", true, self.id ])
       raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is used in relation #{rel.relation.id}.") unless rel.nil?
 
       self.changeset_id = new_relation.changeset_id
diff --git a/app/models/way.rb b/app/models/way.rb
index d37fb1533..64b399133 100644
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -251,7 +251,7 @@ class Way < ActiveRecord::Base
     # shouldn't be possible to get race conditions.
     Way.transaction do
       check_consistency(self, new_way, user)
-      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
+      if RelationMember.find(:first, :joins => :relation,
                              :conditions => [ "visible = ? AND member_type='Way' and member_id=? ", true, self.id])
         raise OSM::APIPreconditionFailedError.new("You need to make sure that the way with id: #{self.id} is not a member of a relation.")
       else
-- 
2.43.2