country-city-state | Laravel Country City State Data | Build Tool library

When you change the fields from select_tag to f.select you're changing the html id and name of the select elements. f.select will generate an id and name prefixed by the model passed into the form. Your javascript will be looking for an ids like country and state. After changing the elements to use rails form builder f.select tags the ids will be something like famous_person_country and famous_person_state.

Check your html source in the browser (view source) to see what ids have been generated in your form for the select tags and update your cities.js javascript accordingly. It should look something like: