adding some activerecord compatibility

2 files changed, 33 insertions, 0 deletions

diff --git a/lib/arel/compatibility/wheres.rb b/lib/arel/compatibility/wheres.rb
new file mode 100644
index 0000000000..eeb7a2fa38
--- /dev/null
+++ b/lib/arel/compatibility/wheres.rb
@@ -0,0 +1,29 @@
+module Arel
+  module Compatibility # :nodoc:
+    class Wheres # :nodoc:
+      include Enumerable
+
+      module Value # :nodoc:
+        attr_accessor :visitor
+        def value
+          visitor.accept self
+        end
+      end
+
+      def initialize engine, collection
+        @engine     = engine
+        @collection = collection
+      end
+
+      def each
+        to_sql = Visitors::ToSql.new @engine
+
+        @collection.each { |c|
+          c.extend(Value)
+          c.visitor = to_sql
+          yield c
+        }
+      end
+    end
+  end
+end
diff --git a/lib/arel/select_manager.rb b/lib/arel/select_manager.rb
index 23d85e3386..f278465c51 100644
--- a/lib/arel/select_manager.rb
+++ b/lib/arel/select_manager.rb
@@ -23,6 +23,10 @@ module Arel
       self
     end
 
+    def wheres
+      Compatibility::Wheres.new @engine, @ctx.wheres
+    end
+
     def take limit
       @head.limit = limit
       self