error using mixins as computed property or in template methods in 0.8.0-rc.7

[jlg7]

Hi,

What is the official determination of using mixins as computed property or template methods? This sample was working early on in 0.8-preview:

<link rel="import" href="bower_components/polymer/polymer.html">
<link rel="import" href="sample-element-mixin.html">

<dom-module id="sample-element">
  <link rel="stylesheet" type="css" href="sample-element.css">
  <template>
    <div>
      <section hidden$="{{hideApp}}">
        <div hidden$="{{!isChromeRuntime}}">
            <h1>Configuration</h1>
            <div>Hide App:</div><span>{{config.showDefaults.hideApp}}</span>
        </div>
      </section>
  </template>
</dom-module>
<script>
    Polymer({

      mixins:[SampleElementMixin],

      is:'sample-element',

      properties:{

        config:{
          type:Object,
          value:function(){ return {"showDefaults":{
            "hideApp":true
          }};}
        },
        hideApp:{
          type:Boolean,
          value:false
        },
        isChromeRuntime:{
          type:Boolean,
          computed:'computeIsChromeRuntime(config)',
          observer:'isChromeRuntimeChanged'
        }
      },
      created:function(){
        if(this._data)
          console.log("created",this.isChromeRuntime);
      },
      ready:function(){
        console.log("ready",this.isChromeRuntime);
      },
      attached:function(){
        console.log("attached",this.isChromeRuntime);
      },
      isChromeRuntimeChanged:function(val){
          console.log("changed",val);
      }
    });
</script>

....

<script>
  SampleElementMixin={

    computeIsChromeRuntime:function(config){
      return "chrome" in window && "runtime" in window.chrome;
    }

  }
</script>

In 0.8.0-rc.7, it does not seem that the mixin methods are available when the properties are computed, I am seeing errors like so:

[kevinpschaaf]

In v0.8.0-rc.7, the mixin feature was deprecated and replaced by the more powerful behaviors feature.
https://github.com/Polymer/polymer/blob/v0.8.0-rc.7/PRIMER.md#behaviors

mixins are a subset of behaviors, so you can basically just rename your mixins block to behaviors.

You are correct in that behaviors can supply computing functions for computed properties or inline computed functions in templates. With the added functionality of behaviors, they can also define properties that will be added to the prototype.

[jlg7]

@kevinpschaaf - TYVM!