X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/db66d47e42bc267670ef00b3b2611b4b53cb40e9..64ecd02f0b74d2251e30fc1c97fdf1aa60f53e90:/app/models/relation.rb

diff --git a/app/models/relation.rb b/app/models/relation.rb
index 5d7092908..c8516b58a 100644
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -106,20 +106,32 @@ class Relation < ActiveRecord::Base
   end 
 
   def self.find_for_nodes(ids, options = {})
-    self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'node' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
-      return self.find(:all, options)
+    if ids.empty?
+      return []
+    else
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'node' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+        return self.find(:all, options)
+      end
     end
   end
 
   def self.find_for_ways(ids, options = {})
-    self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'way' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
-      return self.find(:all, options)
+    if ids.empty?
+      return []
+    else
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'way' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+        return self.find(:all, options)
+      end
     end
   end
 
   def self.find_for_relations(ids, options = {})
-    self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'relation' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
-      return self.find(:all, options)
+    if ids.empty?
+      return []
+    else
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'relation' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+        return self.find(:all, options)
+      end
     end
   end