How I do a json view

<%- 
	start_date = @trip.start_date;
	location_map = @locations.map do | location | 
		map = { 
			:start_date => format_date(start_date), 
			:location_id => location.id, 
			:position => location.position, 
			:title => location.title, 
			:nights => location.nights, 
			:latlng => location.latlng,
			end
		}
		start_date += location.nights.days;
		map
	end	
-%>
<%= location_map.to_json %>