给定 RESTful 服务器上的这些 JSON 数据模型
/用户
{"users":[
{"id":"1","first_name":"John","last_name":"Doe"},
{"id":"2","first_name":"Donald","last_name":"Duck"}
]}
/用户/1
{"user":
{"id":"1","first_name":"John","last_name":"Doe","account":"1"}
}
/账户
{"accounts":[
{"id":"1","owned_by":"1"},{"id":"2","owned_by":"2"}
]}
/账户/1
{"account":
{"id":"1","owned_by":"1","transactions":[1,17]}
}
和这些 Ember 数据模型
App.Store = DS.Store.extend({
revision: 11,
adapter: DS.RESTAdapter.create({
url: 'http://api.mydomain.ca'
})
});
App.User = DS.Model.extend({
firstName: DS.attr('string'),
lastName: DS.attr('string'),
account: DS.belongsTo('App.Account')
});
App.Account = DS.Model.extend({
ownedBy: DS.belongsTo('App.User'),
transactions: DS.hasMany('App.Transaction')
});
我还需要编写哪些其他 ember 代码来将数据加载到模型中,然后编写一个模板来输出用户名、账户 ID 和账户中的交易数量?
最佳答案
我能够解决这个问题,所以我会发布我的代码以防它对其他人有帮助。诀窍是确保 JSON 数据的格式完全符合 Ember 的要求,并创建正确的路由。
据我所知,Ember 希望父对象提供一个子对象列表。这对我来说很奇怪,所以如果有人知道用外键引用其父对象的子对象的方法,请告诉我。
我将/user/:user_id JSON 对象上的帐户属性更改为 account_id 我还在/users 中找到的用户对象上包含了 account_id,并将帐户上的 owned_by 属性更改为 user_id。
我的javascript文件
var App = Ember.Application.create();
// Router
App.Router.map(function() {
this.resource('users', function() {
this.resource('user', {path:':user_id'});
}); // '/#/users/:user_id'
this.resource('accounts', function() {
this.resource('account', {path:':account_id'});
});
});
App.IndexRoute = Ember.Route.extend({
redirect: function() {
this.transitionTo('users');
}
});
App.UsersRoute = Ember.Route.extend({
model: function() {
return App.User.find();
}
});
App.AccountsRoute = Ember.Route.extend({
model: function() {
return App.Account.find();
}
});
// Controllers
App.TransactionsController = Ember.ArrayController.extend();
// Adapter
App.Adapter = DS.RESTAdapter.extend({
url: 'http://api.mydomain.ca'
});
// Models
App.Store = DS.Store.extend({
revision: 11,
adapter: App.Adapter.create({})
});
App.User = DS.Model.extend({
firstName: DS.attr('string'),
lastName: DS.attr('string'),
account: DS.belongsTo('App.Account')
});
App.Account = DS.Model.extend({
user: DS.belongsTo('App.User'),
transactions: DS.hasMany('App.Transaction'),
balance: function() {
return this.get('transactions').getEach('amount').reduce(function(accum, item) {
return accum + item;
}, 0);
}.property('transactions.@each.amount')
});
App.Transaction = DS.Model.extend({
account: DS.belongsTo('App.Account'),
amount: DS.attr('number'),
description: DS.attr('string'),
timestamp: DS.attr('date')
});
还有 Handlebars 模板
<script type="text/x-handlebars" data-template-name="application">
<div class="row">
<div class="twelve columns">
<h2>Accounts</h2>
<p>{{outlet}}</p>
</div>
</div>
</script>
<script type="text/x-handlebars" data-template-name="users">
<div class="row">
<div class="three columns" id="users">
{{#each user in controller }}
{{#linkTo "user" user class="panel twelve columns"}}{{user.firstName}} {{user.lastName}}{{/linkTo}}
{{/each}}
</div>
<div class="nine columns" id="user">
{{ outlet }}
</div>
</div>
</script>
<script type="text/x-handlebars" data-template-name="user">
<h2>{{firstName}} {{lastName}}</h2>
{{#if account}}
{{render "account" account}}
{{else}}
Error: Account not set up!
{{/if}}
</script>
<script type="text/x-handlebars" data-template-name="accounts">
<div class="row">
<div class="three columns" id="accounts">
{{#each account in controller }}
{{#linkTo "account" account class="panel twelve columns"}}{{account.id}} {{account.user.firstName}} {{account.user.lastName}}{{/linkTo}}
{{/each}}
</div>
<div class="nine columns" id="account">
{{ outlet }}
</div>
</div>
</script>
<script type="text/x-handlebars" data-template-name="account">
<p>Account Number: {{id}}, Balance: {{balance}}, {{transactions.length}} transactions</p>
{{render "transactions" transactions}}
</script>
<script type="text/x-handlebars" data-template-name="transactions">
<table class="table table-striped">
<thead>
<tr>
<th>ID</th>
<th>Amount</th>
<th>Timestamp</th>
<th>Description</th>
</tr>
</thead>
<tbody>
{{#each transaction in controller}}
<tr>
<td>{{transaction.id}}</td>
<td>{{transaction.amount}}</td>
<td>{{transaction.timestamp}}</td>
<td>{{transaction.description}}</td>
</tr>
{{/each}}
</tbody>
</table>
</script>
关于javascript - 如何在一个 View 中使用多个 ember 数据模型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14575939/