Trying to produce JSON that is consumable by Dojo

Folks,

When I get data in my test Rails app through a model and convert it to
JSON e.g. Meal.find(:all).to_json, the JSON format I get seems to be
very different from what the dojo.data.ItemFileReadStore expects.

How can I convert the to_json output in Rails to a format consumable by
dojo.data.ItemFileReadStore to be displayed in dijit.form.ComboBox? Is
there a plugin out there that can help me with this?

Thanks for your help.

-S