Boilerplate service for getting 1 or all records of a type.

master-detail service pattern.js

angular
  .module('app')
  .service('MyService', myService);

function myService($http) {
  
  /**
   * First, send a get request for all records of a type,
   * then filter response down to specific record.
   */
  this.getUser = function(id) {
    return this.getAllUsers().then(function(users) {
      return users.find(function(user) {
        return user.id === id;
      }
    }
  }
                        
  this.getAllUsers = function() {
    return $http.get('/users').then(function(resp) {
      return resp.data;
    });
  }

}