Default value in select Ember js

Hello guys I have model Currency. I have fields name:string, default:boolean. In my db only one record can have default value and i want this record was selected in select tag.

My question on stackoverflow is ember.js - Default value in select Ember js - Stack Overflow

I thanks that man for answer but i don’t understand. In what file it’s better to put this extended select? I’ve put it in view file. Is it ok? That is the right way to render this select? As i rendered in my first post? That doesn’t work for me. Sorry for stupid questions but i couldn’t find this info in documentation.