我正在尝试编写一个非常简单的应用程序:我有一些游戏(比如国际象棋、井字棋……等等)，每个游戏都有几个棋盘。我想显示游戏列表，然后在您单击游戏时显示棋盘列表。
但是我面临着很多问题。我将首先描述它们，然后我将粘贴代码:
- 游戏列表已正确显示。这里没问题。
当我点击一个游戏时，出现此错误:
Uncaught Error: assertion failed: an Ember.CollectionView's content must implement Ember.Array. You passed <(generated game controller):ember237>但是如果我按 F5 或手动输入 URL，一切正常。我不知道为什么。
更新:我已经看到，如果我更改
games模板，更改{{#linkTo}}使用手写链接，一切正常:- 这是无效链接:
{{#linkTo 'game' game}}{{game.name}}{{/linkTo}}.它正确地构建了 URL，但是当我点击它时它失败了。 - 这是手写的
<a>标签:<a href="#/games/{{unbound game.id}}">{{game.name}}</a>.效果很好。
- 这是无效链接:
每个版 block 的 Url 应遵循以下格式:
/games/1/boards/5但是当我写
{{#linkTo 'board' board}}我得到的是:/games/undefined/boards/5
这是代码(您可以看到一个“工作”副本 here in JBin 。但它不起作用，因为它在本地 REST 应用程序上中继):
路由器:
MGames.Router.map(function () {
this.resource('games', function () {
this.resource ('game', {path: '/:game_id'}, function () {
this.resource('board', {path: '/boards/:board_id'});
});
});
});
MGames.IndexRoute = Ember.Route.extend({
redirect: function () {
this.transitionTo('games');
}
});
MGames.GamesRoute = Ember.Route.extend ({
model: function() {
return MGames.Game.findAll();
}
});
MGames.GameRoute = Ember.Route.extend ({
model: function(params) {
return MGames.Board.findAllByGame(params.game_id);
}
});
MGames.BoardsRoute = Ember.Route.extend ({
model: function(params) {
return this.modelFor('game').then(
function (game) {
return MGames.Board.find(game.get('id'), params.board_id);
}
);
}
});
模型:
MGames.Game = Ember.Object.extend({
id: null,
name: null,
icon: null
});
MGames.Game.reopenClass({
findAll: function() {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url = url.join('/');
var result = Ember.ArrayProxy.create({ content: [] });
$.getJSON(url).then (
function (response) {
response.forEach(function (child) {
result.pushObject (MGames.Game.create(child));
});
}
);
return result;
},
find: function (id) {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (id);
url = url.join('/');
var game = MGames.Game.create({ isLoaded: false });
$.getJSON(url).then (
function(response) {
game.setProperties(response);
game.set('isLoaded', true);
}
);
return game;
}
});
MGames.Board = Ember.Object.extend({
id: null,
name: null,
owner: null,
game: null,
is_public: null,
created_at: null
});
MGames.Board.reopenClass({
findAllByGame: function (game) {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (game);
url.push ('boards');
url = url.join('/');
var result = Ember.ArrayProxy.create({ content: [] });
$.getJSON(url).then (
function (response) {
console.log (response);
response.forEach(function (child) {
result.pushObject (MGames.Board.create(child));
});
}
);
return result;
},
find: function (game, board) {
url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (game);
url.push ('boards');
url.push (board);
url = url.join('/');
var result = MGames.Board.create();
$.getJSON(url).then (
function(response) {
result.setProperties(response);
}
);
return result;
}
});
和模板:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>MGames</title>
<link rel="stylesheet" href="css/bootstrap.css">
<link rel="stylesheet" href="css/main.css">
</head>
<body>
<script type="text/x-handlebars">
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<div class="nav-collapse collapse">
<ul class="nav">
<li class="active">{{#linkTo 'index' class="brand"}}MGames{{/linkTo}}</li>
</ul>
</div>
</div>
</div>
</div>
<div class="container">
{{outlet}}
</div>
</script>
<script type="text/x-handlebars" id="games">
<div class="row">
<header id="header">
<h1>Games</h1>
</header>
<ul>
{{#each game in controller}}
<li>
{{#linkTo 'game' game}}{{game.name}}{{/linkTo}}
</li>
{{/each}}
</ul>
{{outlet}}
</div>
</script>
<script type="text/x-handlebars" id="game">
<div class="row">
<div class="span3" id="boards">
<header id="header">
<h1>Boards</h1>
</header>
<ul id="board-list">
{{#each board in controller}}
<li>
{{#linkTo 'board' board}}{{board.name}}{{/linkTo}}
</li>
{{/each}}
</ul>
</div>
<div class="span9">
{{outlet}}
</div>
</div>
</script>
<script type="text/x-handlebars" id="board">
<header id="header">
<h1>{{game.name}} - {{name}} <small>{{owner.nickname}}</small></h1>
</header>
</script>
<script src="js/libs/jquery.js"></script>
<script src="js/libs/bootstrap.js"></script>
<script src="js/libs/handlebars.js"></script>
<script src="js/libs/ember.js"></script>
<script src="js/application.js"></script>
<script src="js/router.js"></script>
<script src="js/models/game.js"></script>
<script src="js/models/user.js"></script>
</body>
</html>
最佳答案
好吧，我终于想通了这个问题。在我的 gameRoute 中，我这样写:
MGames.GameRoute = Ember.Route.extend ({
model: function(params) {
return MGames.Board.findAllByGame(params.game_id);
}
});
当我直接在浏览器栏中写入 URL 时，它起作用了，因为 Ember 调用了 model 函数，但是当遵循 {{#linkTo}} 时，模型是作为参数传递的那个，因此不会调用 model 函数。
所以工作代码是这个(有点简化):
MGames.GameRoute = Ember.Route.extend ({
model: function (params) {
// This is only called when loading the URL directly,
// not following a link. We load the game, and in the
// setupController we'll load the boards.
return MGames.Game.find(params.game_id);
},
setupController: function(controller, game) {
// This is *always* called, so we load the boards
model = MGames.Board.findAllByGame(game.id);
controller.set('model', model);
}
});
关于javascript - 使用 Ember.js 加载单个模型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17466355/