The quotes are important. It won’t work with double quotes inside double quotes or single quotes inside single quotes.
What does work:
<select ng-model="buyers" ng-options="b.id as (b.first_name + " " + b.last_name) for b in buyers"></select>
The quotes are important. It won’t work with double quotes inside double quotes or single quotes inside single quotes.
What does work:
<select ng-model="buyers" ng-options="b.id as (b.first_name + " " + b.last_name) for b in buyers"></select>