[英]Display the first item in hasMany ember relationship in handlebars template
I need to display the first item in an hasMany relationship 我需要在hasMany关系中显示第一个项目
Basically a thread could have more than 1 author but I need to display only the first one in a particular template 基本上一个线程可以有多个作者,但我需要只显示特定模板中的第一个
I've the following json 我有以下的json
{
threads: [
{
id: 1,
authors: [2,3]
}
],
authors: [
{
id: 2,
fullname: "foo"
},
{
id: 3,
fullname: "bar"
}
]
}
And the following models 以及以下型号
App.Thread = DS.Model.extend({
authors: DS.hasMany('author')
});
App.Author = DS.Model.extend({
fullname: DS.attr('string')
});
now in my template I'm tring to do something like {{thread.authors[0].fullname}}
but it doesn't work. 现在在我的模板中,我想做一些像
{{thread.authors[0].fullname}}
这样的东西,但它不起作用。 I've tried also thread.authors.0.fullname
according to the handlebars syntax but nothing changed. 我根据把手语法尝试了
thread.authors.0.fullname
但没有改变。
Thnx in advance for your help Thnx提前为您提供帮助
Use Ember.Enumerable's firstObject
: 使用Ember.Enumerable的
firstObject
:
{{thread.firstObject.fullName}}
If you are going to use it in a lot of places, its best to define it as a computed property in the model: 如果要在很多地方使用它,最好将其定义为模型中的计算属性:
App.Thread = DS.Model.extend({
authors: DS.hasMany('author')
firstAuthor: Ember.computed.alias('authors.firstObject')
});
and use it in your templates as: 并在模板中使用它:
{{firstAuthor.name}}
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