Revert "FIX #40: Handle enum attributes while instantiating rows"

Author: afair

lib/postgresql_cursor/cursor.rb

@@ -110,7 +110,12 @@ def each_array(&block)
     def each_instance(klass=nil, &block)
       klass ||= @type
       self.each_tuple do |row|
-        klass.send(:instantiate, row)
+        if ::ActiveRecord::VERSION::MAJOR < 4
+          model = klass.send(:instantiate,row)
+        else
+          @column_types ||= column_types
+          model = klass.send(:instantiate, row, @column_types)
+        end
         block.call(model)
       end
     end
@@ -139,7 +144,12 @@ def each_instance_batch(klass=nil, &block)
       klass ||= @type
       self.each_batch do |batch|
         models = batch.map do |row|
-          klass.send(:instantiate, row)
+          if ::ActiveRecord::VERSION::MAJOR < 4
+            model = klass.send(:instantiate, row)
+          else
+            @column_types ||= column_types
+            model = klass.send(:instantiate, row, @column_types)
+          end
         end
         block.call(models)
       end