1 files changed, 9 insertions, 0 deletions
diff --git a/lib/arel/tree_manager.rb b/lib/arel/tree_manager.rb
index 6176f8a250..2fa770a0e3 100644
--- a/lib/arel/tree_manager.rb
+++ b/lib/arel/tree_manager.rb
@@ -9,6 +9,7 @@ module Arel
     def initialize engine
       @engine  = engine
       @visitor = Visitors.visitor_for @engine
+      @ctx     = nil
     end
 
     def to_dot
@@ -23,5 +24,13 @@ module Arel
       super
       @ast = @ast.clone
     end
+
+    def where expr
+      if Arel::TreeManager === expr
+        expr = expr.ast
+      end
+      @ctx.wheres << expr
+      self
+    end
   end
 end