use instance_exec, should work as instance_eval and may fix in jruby

Author: scambra

lib/active_scaffold/finder.rb

@@ -756,7 +756,7 @@ def apply_conditions(relation, *conditions)
     def sort_collection_by_column(collection, column, order)
       sorter = column.sort[:method]
       collection = collection.sort_by do |record|
-        value = sorter.is_a?(Proc) ? record.instance_eval(&sorter) : record.instance_eval(sorter.to_s)
+        value = sorter.is_a?(Proc) ? record.instance_exec(record, &sorter) : record.instance_eval(sorter.to_s)
         value = '' if value.nil?
         value
       end

test/misc/finder_test.rb

@@ -33,7 +33,7 @@ def test_create_conditions_for_columns
 
   def test_method_sorting
     column = ActiveScaffold::DataStructures::Column.new('a', ModelStub)
-    column.sort_by method: proc { itself }
+    column.sort_by method: proc { |r| self }
 
     collection = [16_000, 2853, 98_765, 6188, 4]
     assert_equal collection.sort, @klass.send(:sort_collection_by_column, collection, column, 'asc')
@@ -43,7 +43,7 @@ def test_method_sorting
     result = @klass.send(:sort_collection_by_column, collection, column, 'asc')
     assert_equal [nil, 'a', 'b'], result
 
-    column.sort_by method: 'itself'
+    column.sort_by method: 'self'
     collection = [3, 1, 2]
     assert_equal collection.sort, @klass.send(:sort_collection_by_column, collection, column, 'asc')
   end