406 (Not Acceptable) error on rails and jquery mobile autocomplete?
I'd guess that Rails thinks you're asking for HTML back. Your ajax_artist can only ever respond (sensibly) with JSON so try ignoring the format completely.
Related Questions
JQuery autocomplete json source - Does not autocomplete, but just show the full list?
Spring-MVC 406 Not Acceptable instead of JSON Response?
Error with jquery-autocomplete in rails?
Why doesn't the BlackBerry Curve have autocomplete? My friend has the Pearl and it has autocomplete?
What aspects of psychological therapy are acceptable and not acceptable to people with severe and complex mental health problems?
What things that are socially acceptable in Japan but are not acceptable in the U.S. will be in the near future?