5 files changed, 25 insertions, 5 deletions

diff --git a/lib/active_relation/predicates.rb b/lib/active_relation/predicates.rb
index 6616cfd414..fba1cc90b6 100644
--- a/lib/active_relation/predicates.rb
+++ b/lib/active_relation/predicates.rb
@@ -40,15 +40,31 @@ module ActiveRelation
     end
   
     class GreaterThanOrEqualTo < Binary
+      protected
+      def predicate_sql
+        '>='
+      end
     end
   
     class GreaterThan < Binary
+      protected
+      def predicate_sql
+        '>'
+      end
     end
   
     class LessThanOrEqualTo < Binary
+      protected
+      def predicate_sql
+        '<='
+      end
     end
   
     class LessThan < Binary
+      protected
+      def predicate_sql
+        '<'
+      end
     end
   
     class Match < Base
@@ -69,6 +85,10 @@ module ActiveRelation
       def ==(other)
         super and attribute == other.attribute and relation == other.relation
       end
+      
+      def to_sql(options = {})
+        "#{attribute.to_sql} IN (#{relation.to_sql})"
+      end
     end
   end
 end
\ No newline at end of file
diff --git a/lib/active_relation/relations/order.rb b/lib/active_relation/relations/order.rb
index c8034d2f17..bca81c1b6d 100644
--- a/lib/active_relation/relations/order.rb
+++ b/lib/active_relation/relations/order.rb
@@ -1,7 +1,7 @@
 module ActiveRelation
   module Relations
     class Order < Compound
-      attr_reader :relation, :orders
+      attr_reader :orders
   
       def initialize(relation, *orders)
         @relation, @orders = relation, orders
diff --git a/lib/active_relation/relations/projection.rb b/lib/active_relation/relations/projection.rb
index df25d16234..131db916f0 100644
--- a/lib/active_relation/relations/projection.rb
+++ b/lib/active_relation/relations/projection.rb
@@ -1,14 +1,14 @@
 module ActiveRelation
   module Relations
     class Projection < Compound
-      attr_reader :relation, :attributes
+      attr_reader :attributes
   
       def initialize(relation, *attributes)
         @relation, @attributes = relation, attributes
       end
   
       def ==(other)
-        relation == other.relation and attributes == other.attributes
+        self.class == other.class and relation == other.relation and attributes == other.attributes
       end
   
       def qualify
diff --git a/lib/active_relation/relations/rename.rb b/lib/active_relation/relations/rename.rb
index 8f28c94d52..c7b99c2127 100644
--- a/lib/active_relation/relations/rename.rb
+++ b/lib/active_relation/relations/rename.rb
@@ -1,7 +1,7 @@
 module ActiveRelation
   module Relations
     class Rename < Compound
-      attr_reader :relation, :schmattribute, :alias
+      attr_reader :schmattribute, :alias
   
       def initialize(relation, renames)
         @schmattribute, @alias = renames.shift
diff --git a/lib/active_relation/relations/selection.rb b/lib/active_relation/relations/selection.rb
index e102d105a0..e86dc627db 100644
--- a/lib/active_relation/relations/selection.rb
+++ b/lib/active_relation/relations/selection.rb
@@ -1,7 +1,7 @@
 module ActiveRelation
   module Relations
     class Selection < Compound
-      attr_reader :relation, :predicate
+      attr_reader :predicate
   
       def initialize(relation, *predicates)
         @predicate = predicates.shift