controller_6.js

/* A éviter */
function Order ($http, $q) {
  var vm = this;
  vm.checkCredit = checkCredit;
  vm.total = 0;

  function checkCredit () { 
    var orderTotal = vm.total;
    return $http.get('api/creditcheck').then(function (data) {
        var remaining = data.remaining;
        return $q.when(!!(remaining > orderTotal));
    });
  };
}

/* Recommandé */
function Order (creditService) {
  var vm = this;
  vm.checkCredit = checkCredit;
  vm.total = 0;

  function checkCredit () { 
    return creditService.check();
  };
}