问题描述
我的理解是，观察 '@each' 意味着我正在观察数组中任何属性的任何更改，但它似乎不起作用.例如:
My understanding is that observing for '@each' means that I'm observing any change to any property in an array, but it doesn't seem to work. For example:
App.ArrayProxy = Ember.ArrayProxy.extend({
i: 0,
foo: function(){
console.log('foo called');
return ++this.i;
}.property('content.@each')
});
我也尝试过 .property('@each') 而不是 .property('content.@each')，结果同样令人失望.
I've also tried .property('@each') instead of .property('content.@each') with equally disappointing results.
这是一个演示的jsbin:http://jsbin.com/hagar/5/edit
Here is a jsbin that demonstrates: http://jsbin.com/hagar/5/edit
在演示中，更改数组列表本身(通过单击删除最后一个"按钮)会触发foo"计算属性的刷新，但更改数组中对象的属性不会.
In the demo, changing the array list itself (by clicking the 'Remove Last' button) triggers a refresh of the 'foo' computed property, but changing a property of an object in the array doesn't.
有什么办法可以解决这个问题?
Any way around this problem?
推荐答案
您需要使用 setter(或内置的 incrementProperty)，如果您关心名称何时更改，我添加了名称.
You need to use a setter (or the built in incrementProperty), I added name if you care when the name was changed.
foo: function(){
console.log('foo called');
return this.incrementProperty('i');
}.property('[email protected]')
如果您不关心它在名称更改时递增，您可以使用 foo.[] ，它只会在添加/删除数组项时显示.
If you don't care about it incrementing when name changes you would use foo.[] which would only show when the array items are added/removed.
foo: function(){
console.log('foo called');
return this.incrementProperty('i');
}.property('content.[]')
http://jsbin.com/bakoqawi/1/edit
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