table_for.rb in activeadmin-1.4.0

- old
+ new

@@ -174,21 +174,12 @@
         #
         # You can set the sort key by passing a string or symbol
         # to the sortable option:
         #   column :username, sortable: 'other_column_to_sort_on'
         #
-        # If you pass a block to be rendered for this column, the column
-        # will not be sortable unless you pass a string to sortable to
-        # sort the column on:
-        #
-        #   column('Username', sortable: 'login'){ @user.pretty_name }
-        #   # => Sort key will be 'login'
-        #
         def sort_key
           # If boolean or nil, use the default sort key.
-          if @options[:sortable] == true || @options[:sortable] == false
-            @data.to_s
-          elsif @options[:sortable].nil?
+          if @options[:sortable].nil? || @options[:sortable] == true || @options[:sortable] == false
             sort_column_name
           else
             @options[:sortable].to_s
           end
         end