ember.js Reset route variable when changed model

I am creating some CRUD Ember.js 2.1.0 / Ember-data 2.1.0 with Ruby on Rails 5.

I have contacts and contacts/show route

When I click a item in list, current route Change to contacts/show route.

and contacts/show has isEdit variable for inline editing. but I expect isEdit will be reset when I click another item.

check my console when beforeModel, afterModel and setupController, all of my test spit false out. but it is not related with isEdit and template.

I click edit button isEdit is changed true

<p>
{{#if isEdit}}
<button {{action "save"}}>SAVE</button>
<button {{action "cancel"}}>CANCEL</button>
{{else}}
<button {{action "edit"}}>EDIT</button>
{{/if}}
</p>

my contacts/show template

        save: function() {
        var controller = this.controller;
        var item = controller.get('model');
        if(!item.get('title') || item.get('title') === '') {
            item.rollbackAttributes();
            controller.set('isEdit', false);
        } else {            
            item.save();
            controller.set('isEdit', false);            
        }
    },

it works well, but I can't get 'false' on loaded new model

How I set isEdit false when I change same route and different model?