I am a beginner in rails and I have this array of times:

> 
> ["08:30", "09:00", "09:30", "10:00", "10:30", "11:00", "11:30",
>  "12:00", "12:30", "13:00", "13:30", "14:00", "14:30", "15:00",
>  "15:30", "16:00", "16:30", "17:00", "17:30", "18:00", "18:30",
>  "19:00", "19:30", "20:00", "20:30", "21:00", "21:30"]
> 
> 
> 

How can I convert it into a dropdown using `options_from_collection_for_select`. I tried using 

`<%= select_tag "start_time", options_from_collection_for_select(@start_time,:id, :name ) %>`

but it returned `"undefined method 'name' for "08:30":String"`.