seems to work

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  currentModel: null,
  foo: Ember.computed.alias('currentModel'),
  actions: {
    setSomething() {
      this.setProperties({
        'foo.share': 'wowzers '
      }); 
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

models.my-model.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  share: DS.attr()
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.store.createRecord('my-model', {
      share: 'gonna share!'
    }); 
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-component currentModel=model}}
<br>
<br>

templates.components.my-component.hbs

<p>my-component's currentModel: {{currentModel}}</p>
<p>my-component's currentModel.share: {{currentModel.share}}</p>
<p>my-component's foo: {{foo}}</p>
<button onclick={{action 'setSomething'}}>Set it</button>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}