1 files changed, 21 insertions, 0 deletions
diff --git a/lib/arel/relations/selection.rb b/lib/arel/relations/selection.rb
new file mode 100644
index 0000000000..38a40e1b76
--- /dev/null
+++ b/lib/arel/relations/selection.rb
@@ -0,0 +1,21 @@
+module Arel
+  class Selection < Compound
+    attr_reader :predicate
+
+    def initialize(relation, *predicates)
+      predicate = predicates.shift
+      @relation = predicates.empty?? relation : Selection.new(relation, *predicates)
+      @predicate = predicate.bind(@relation)
+    end
+
+    def ==(other)
+      self.class == other.class and
+      relation   == other.relation and
+      predicate  == other.predicate
+    end
+    
+    def selects
+      relation.selects + [predicate]
+    end    
+  end
+end
+\ No newline at end of file