Fix Queries namespace reference

app/models/queries/relations.rb

@@ -29,9 +29,9 @@
 
 module Queries
   module Relations
-    register = Queries::Register
-    filters = Queries::Relations::Filters
-    query = Queries::Relations::RelationQuery
+    register = ::Queries::Register
+    filters = ::Queries::Relations::Filters
+    query = ::Queries::Relations::RelationQuery
 
     register.filter query, filters::IdFilter
     register.filter query, filters::FromFilter
@@ -39,6 +39,6 @@ module Queries
     register.filter query, filters::InvolvedFilter
     register.filter query, filters::TypeFilter
 
-    register.order query, Queries::Relations::Orders::DefaultOrder
+    register.order query, ::Queries::Relations::Orders::DefaultOrder
   end
 end