{ data: [
    { id: 5, name: 'peter' },
    { id: 10, name: 'adan' }
] }

{ data: { id: 5, name: 'peter' } }

Restangular.one('users', 5).get().then(function(user){
    $scope.user = user;
});

Restangular.all('users').getList().then(function(users){
    $scope.user = users[0];
});

RestangularProvider.setResponseInterceptor(function(response, operation, what) {
    if (operation === "getList") {
        // from:
        // {data: [{ id: 1, name: 'peter' }, { id: 2, name: 'adan' }]}
        // to:
        // [{ id: 1, name: 'peter' }, { id: 2, name: 'adan' }]
        return response.data;
    }
    return response;
});

if (operation === "getList") {
    // from:
    // {data: [{ id: 1, name: 'peter' }, { id: 2, name: 'adan' }]}
    // to:
    // [{ id: 1, name: 'peter' }, { id: 2, name: 'adan' }]
    return response.data;
}
return response;

[
    { id: 5, name: 'peter' },
    { id: 10, name: 'adan' }
]

{
    data: {
        id: 5,
        name: 'peter'
    }
}