保存当前用户信息并在控制器中使用 [英] Save current user information and use it in controllers

问题描述

我有以下Angular服务:

I have the following Angular service:

angular.module("app").factory("userService", userService);

userService.$inject = ["$http"];

function userService($http) {
  return { 
    getAuthenticatedUserInfo: function () {
      return $http.get("/api/v1/users/me");
    }     
  }
}

我正在获取有关当前用户的信息，例如ID，名称，...

I am getting information about the current user such as Id, Name, ...

我想在我的控制器中使用此信息，但是我不想每次需要该信息时都调用API(getAuthenticatedUserInfo)...有意义吗?

I want to use this information in my controllers but I do not want to call the API (getAuthenticatedUserInfo) everytime I need that information ... Does it make sense?

在其他控制器中使用此信息的最佳选择是什么?

What is the best option use this information in other controllers?

推荐答案

在服务中创建一个局部变量，并将用户存储在其中.如果本地变量未定义，则仅执行HTTP调用.要确保始终返回一个承诺，无论本地用户是否可用，请使用$ q的when函数:

Create a local variable within the service and store the user in there. Only perform the HTTP call if the local variable is undefined. To make sure you always return a promise, whether the local user is available or not, use $q's when function:

angular.module("app").factory("userService", userService);

userService.$inject = ["$http", "$q"];

function userService($http, $q) {

    var currentUser;
  return { 
    getAuthenticatedUserInfo: function () {
        if (currentUser){
            return $q.when(currentUser);            
        } else {
            return $http.get("/api/v1/users/me").then(function(response) {
                currentUser = response.data;
                return response.data;
            });
        }

    }     
  }
}

PS从不使用全局变量

PS never ever use global variables

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