Update cookbook/form/form_collections.rst

tvlooy · weaverryan · commit e5360fb4e216 · 2012-12-26T12:40:41.000-05:00
index should start counting at 0 or form_errors() are rendered at the wrong field
diff --git a/cookbook/form/form_collections.rst b/cookbook/form/form_collections.rst
@@ -395,7 +395,7 @@ one example:
 
         // Replace '$$name$$' in the prototype's HTML to
         // instead be a number based on the current collection's length.
-        var newForm = prototype.replace(/\$\$name\$\$/g, collectionHolder.children().length);
+        var newForm = prototype.replace(/\$\$name\$\$/g, collectionHolder.children().length - 1);
 
         // Display the form in the page in an li, before the "Add a tag" link li
         var $newFormLi = $('<li></li>').append(newForm);
