1 files changed, 50 insertions, 3 deletions
diff --git a/lib/arel/engines/memory/predicates.rb b/lib/arel/engines/memory/predicates.rb
index d0963e2f74..c0ee862626 100644
--- a/lib/arel/engines/memory/predicates.rb
+++ b/lib/arel/engines/memory/predicates.rb
@@ -5,6 +5,49 @@ module Arel
         operand1.eval(row).send(operator, operand2.eval(row))
       end
     end
+    
+    class Unary < Predicate
+      def eval(row)
+        operand.eval(row).send(operator)
+      end
+    end
+    
+    class Not < Unary
+      def operator; '!' end
+    end
+    
+    class CompoundPredicate < Binary
+      def eval(row)
+        eval "operand1.eval(row) #{operator} operand2.eval(row)"
+      end
+    end
+
+    class Or < CompoundPredicate
+      def operator; :or end
+    end
+
+    class And < CompoundPredicate
+      def operator; :and end
+    end
+    
+    class GroupedPredicate < Polyadic
+      def eval(row)
+        group = additional_operands.inject([]) do |results, operand|
+          results << operator.new(operand1, operand)
+        end
+        group.send(compounder) do |operation|
+          operation.eval(row)
+        end
+      end
+    end
+    
+    class Any < GroupedPredicate
+      def compounder; :any? end
+    end
+    
+    class All < GroupedPredicate
+      def compounder; :all? end
+    end
 
     class Equality < Binary
       def operator; :== end
@@ -37,16 +80,20 @@ module Arel
     end
     
     class NotMatch < Binary
-      def operator; :!~ end
+      def eval(row)
+        operand1.eval(row) !~ operand2.eval(row)
+      end
     end
 
     class In < Binary
-      def operator; :include? end
+      def eval(row)
+        operand2.eval(row).include?(operand1.eval(row))
+      end
     end
     
     class NotIn < Binary
       def eval(row)
-        !(operand1.eval(row).include?(operand2.eval(row)))
+        !(operand2.eval(row).include?(operand1.eval(row)))
       end
     end
   end