1 files changed, 2 insertions, 10 deletions
diff --git a/lib/arel/algebra/relations/operations/where.rb b/lib/arel/algebra/relations/operations/where.rb
index 2fc51c7f24..6c9c5ed755 100644
--- a/lib/arel/algebra/relations/operations/where.rb
+++ b/lib/arel/algebra/relations/operations/where.rb
@@ -1,7 +1,8 @@
 module Arel
   class Where < Compound
     attributes :relation, :predicate
-    deriving :==
+    deriving   :==
+    requires   :restricting
 
     def initialize(relation, *predicates, &block)
       predicate = block_given?? yield(relation) : predicates.shift
@@ -9,15 +10,6 @@ module Arel
       @predicate = predicate.bind(@relation)
     end
 
-    def engine
-      # Temporary check of whether or not the engine supports where.
-      if relation.engine.respond_to?(:supports) && !relation.engine.supports(:where)
-        Memory::Engine.new
-      else
-        relation.engine
-      end
-    end
-
     def wheres
       @wheres ||= (relation.wheres + [predicate]).collect { |p| p.bind(self) }
     end