Ember.js通用计算属性模式的简写 [英] Ember.js shorthand for common computed property pattern

问题描述

  someProp：function（）{
 return this.get（'otherProp'）; 
} .property（'otherProp'）
  

或

  someProp：function（）{
 return this.get（'otherObject.prop'）; 
} .property（'otherObject.prop'）
  

是否有较短的写入方式计算的属性遵循这些模式？

解决方案

经过研究，你可以干一点，帮助 Ember.computed.alias ：

  someProp：Ember.computed.alias（otherObject。支持）
  

您可以使用别名设置此属性。给出一个实现上面给出的属性的Ember对象，你可以执行以下操作：

  obj.set（someProp，foo或随你）; //该集合将被传播到otherObject.prop 
  

链接到Ember.com的Ember Source for Ember.computed.alias

---

更新：Ember.computed.oneWay

最近，一个新的计算属性简写（ oneWay ）被添加到Ember，这也是可行的。不同的是， oneWay 简写仅适用于获取案例。因此，在对象创建过程中，这种速记比更复杂的别名更快。

  someProp：Ember.computed.oneWay（otherObject.prop）
  / pre> 
 
 
 链接到Ember.com的Ember源for Ember.computed.oneWay  
 
In Ember.js I find myself defining computed properties that look like this:
someProp: function(){
  return this.get('otherProp');
}.property('otherProp')
or
someProp: function(){
  return this.get('otherObject.prop');
}.property('otherObject.prop')
Is there a shorter way to write computed properties that follow these patterns?
解决方案
Having researched a little bit you could dry this a little up by doing the following with the help of Ember.computed.alias:
someProp: Ember.computed.alias("otherObject.prop")
You can use alias also to set this property. Given an Ember object which implements the property given above, you can do:
obj.set("someProp", "foo or whatever"); // The set will be propagated to otherObject.prop
Link to Ember Source for Ember.computed.alias



Update: Ember.computed.oneWay 

Recently a new computed property shorthand (oneWay) was added to Ember, which is also feasible for this requirement. The difference is that the oneWay shorthand only works in the get case. Therefore this shorthand is faster during object creation than the more complex alias. 
someProp: Ember.computed.oneWay("otherObject.prop")
Link to Ember Source for Ember.computed.oneWay

                        
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