在angularjs应用程序中在哪里放置对firebase的重复调用? [英] Where to put duplicate calls to firebase in angularjs app?

问题描述

我需要在每个控制器中从 firebase 获取一组 products，如果我不必每次都进行 API 调用，那将是理想的.使用 angularfire 库实现这一目标的最佳方法是什么?

I need to get a set of products from firebase in every controller, and it would be ideal if I don't have to make an API call every single time. What is the best way to achieve this with the angularfire library?

https://www.firebase.com/docs/web/libraries/angular/api.html#angularfire-firebasearray

现在我有(在 coffeescript 中):

Right now I have (in coffeescript):

app = angular.module 'EApp', ['ui.router', 'firebase']

app.config ($stateProvider, $urlRouterProvider) ->

  $stateProvider
    .state 'catalog',
      url: '/catalog'
      templateUrl: 'partials/catalog.html'
      controller: 'catalogCtrl'
    .state 'product',
      url: '/product/:id'
      templateUrl: 'partials/product.html'
      controller: 'productCtrl'

  $urlRouterProvider.otherwise 'catalog'
  return

app.controller 'catalogCtrl', ($scope, $rootScope, $firebase) ->
  ref = new Firebase("https://my-url.firebaseIO.com/")
  $scope.products = $firebase(ref).$asArray()
  return

app.controller 'productCtrl', ($scope, $rootScope, $stateParams, $firebase) ->
  ref = new Firebase("https://my-url.firebaseIO.com/")
  $scope.products = $firebase(ref).$asArray()
  return

有什么方法可以分解出 2 个控制器中的通用代码并在 $rootScope(或类似)级别设置 products 以便我可以执行 <返回产品后，在 productCtrl 中的代码>_.find?

Is there any way to factor out the common code in the 2 controllers and set products at the $rootScope (or similar) level such that I can do a _.find in productCtrl once the products have been returned?

推荐答案

正如@tymeJV 在他的评论中所说，我确实为数组设置了一个服务:

As @tymeJV says in his comment, I'd indeed set up a service for the array:

app.constant('FBURL', "https://my-url.firebaseio.com/");
app.factory('products', function($firebase, FBURL) {
    var ref = new Firebase(FBURL);  
    var products = $firebase(ref).$asArray();
    return products;
}

然后简单地将其注入您的控制器而不是(或除了)$firebase:

And then simply inject that into your controllers instead of (or in addition to) $firebase:

app.controller 'catalogCtrl', ($scope, products) ->
    $scope.products = products
    return

在 我的 Trenches 应用程序中，我使用这种方法来设置这个微不足道的服务包装 $firebaseSimpleLogin:

In my trenches app I've used this approach to set up this trivial service wrapping $firebaseSimpleLogin:

app.factory('$firebaseAuth', function($firebase, $firebaseSimpleLogin, FBURL) {
    var auth = $firebaseSimpleLogin(new Firebase(FBURL));
    return auth;
});

还有一个不太重要的服务，它依赖于当前的 URL/路由(下面的简化片段，完整"代码在 github 上):

And a somewhat less trivial service that depends on the current URL/route (simplified snippet below, "full" code is on github):

app.factory('board', function($firebase, $firebaseAuth, FBURL, $routeParams) {
    var ref = new Firebase(FBURL+"boards/"+$routeParams.boardId);    
    var cards = $firebase(ref.child('cards')).$asArray();    
    return {
        ref: ref,
        id: $routeParams.boardId,
        cards: cards,
    }
});

这篇关于在angularjs应用程序中在哪里放置对firebase的重复调用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！