select-angular.html

<div ng-app="app">

    <div ng-controller="Ctrl1">
        <select ng-model="foo" ng-options="o as o.name for o in options">
        </select>
    </div>

    <div ng-controller="Ctrl2">
        <select ng-model="foo" ng-options="o.id as o.name for o in options">
        </select>
    </div>

</div>

select-angular.js

var app = angular.module('app', [ 'controllers' ]);

var controllers = angular.module('controllers', []);

controllers.controller('Ctrl1', [ '$scope', function ($scope) {

    $scope.options = [
        { id: 'a', name: 'Apple' },
        { id: 'b', name: 'Banana' }
    ];
    
    function getOption (id) {
        return $scope.options.filter(function (option) {
            return option.id === id;
        })[0];
    }

    $scope.foo = getOption('b');

} ]);


controllers.controller('Ctrl2', [ '$scope', function ($scope) {

    $scope.options = [
        { id: 'a', name: 'Apple' },
        { id: 'b', name: 'Banana' }
    ];

    $scope.foo = 'b';

} ]);