How to change a component based on route or handlebars condition

adapters.application.js

import DS from 'ember-data';
export default DS.RESTAdapter.extend({
});

adapters.page.js

import Eudora from './application';
export default Eudora.extend({
    pathForType() {      
        return 'pages';
    }
});

adapters.post.js

import Eudora from './application';

export default Eudora.extend({

    pathForType() {
        return 'posts';
    }
});

components.global-navigation.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  single:Ember.computed('currentRouteName',function(){    
    if(this.get('currentRouteName') === 'posts.single'){
      return true;
    }
    return false;
  }),
});

initializers.pretender.js

export function returnJSON(status, body) {
  return json(...arguments);
};

export function json(status, body) {
  if (arguments.length === 1) {
    body = status;
    status = 200;
  }
  
  return [
    status,
    { "Content-Type": "application/json" },
    JSON.stringify(body)
  ];
};

export const server = new Pretender();

export function initialize() {
  server.handledRequest = function(verb, path, request) {
    console.log(`handled request to ${verb} ${path}`);
  }

  server.unhandledRequest = function(verb, path, request) {
    console.log(`undhandled request ${verb} ${path}`);
  }
};

export default {
  name: 'pretender',
  initialize
};

models.page.js

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

export default Model.extend({
  title: attr(), 
});
*/
import Model from 'ember-data/model';
import DS from 'ember-data';

const { 
    attr,
    //belongsTo 
} = DS;

export default Model.extend({

    title: attr()

});

models.post.js

import Model from 'ember-data/model';
import DS from 'ember-data';

const { 
    attr,
    //belongsTo 
} = DS;

export default Model.extend({

    //user: belongsTo('user'),
    title: attr(),
    //excerpt: attr(),
    //date: attr('string')

});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
    this.route('posts', function() {
    this.route('user', { path: '/user/:id' } );
    this.route('single', { path: '/:id', } );
  });
  this.route('pages');
});

export default Router;

routes.application.js

import Ember from 'ember';
import { server, json } from '../initializers/pretender';
const {
    Route,
    set
} = Ember;

server.map(function() {
  this.get('/pages', function() {
    return json(
  [
    {
      "id":139,
      "title":{
         "rendered":"test"
      }   
    }    
  ]
);
  });
});
export default Ember.Route.extend({
  model(){
    return this.store.findAll('page');
  },
  setupController(controller, model) {
        set(controller, 'pages', model);
    }
});

routes.pages.js

import Ember from 'ember';

const {
    Route,
    set
} = Ember;

export default Route.extend({

    model() {

        return this.store.findAll('page');
    },

    setupController(controller, model) {
        set(controller, 'pages', model);
    }
});

routes.posts.js

import Ember from 'ember';
import { server, json } from '../initializers/pretender';

const {
    Route,
    set
} = Ember;

server.map(function() {
  this.get('/posts', function() {
    return json(
  [
    {
      "id":139,
      "title":{
         "rendered":"test"
      }   
    }    
  ]
);
  });
});
export default Route.extend({

    model() {

        return this.store.findAll('post');
    },

    setupController(controller, model) {
        set(controller, 'posts', model);
    }
});

routes.posts.single.js

import Ember from 'ember';
import { server, json } from '../../initializers/pretender';

const {
    Route,
    set
} = Ember;
server.map(function() {
  this.get('/posts/139', function() {
    return json(
  [
    {
      "id":139,
      "title":{
         "rendered":"139 post"
      }   
    }    
  ]
);
  });
});
export default Route.extend({

    //templateName: 'posts/single',

    model(params) {

        return this.store.findRecord('post', params.id);
    },

    setupController(controller, model) {
        set(controller, 'post', model);
    }


});

serializers.application.js

import DS from 'ember-data';
export default DS.RESTSerializer.extend({
  normalizeResponse( store, primaryModelClass, payload, id, requestType) {

        payload = { pages: payload };

        return this._super( store, primaryModelClass, payload, id, requestType );

    }
});

serializers.page.js

import DS from 'ember-data';

export default DS.RESTSerializer.extend({

    normalizeResponse( store, primaryModelClass, payload, id, requestType) {

        payload = { pages: payload };

        return this._super( store, primaryModelClass, payload, id, requestType );

    }
});

serializers.post.js

//import JSONAPISerializer from 'ember-data/serializers/json-api';
import DS from 'ember-data';

export default DS.RESTSerializer.extend({

    normalizeResponse(store,primaryModelClass,payload,id,requestType) {

        payload = { posts: payload };
        //console.log(payload);

        return this._super(store,primaryModelClass,payload,id,requestType);

    },

    normalizeSingleResponse(store,primaryModelClass,payload,id,requestType) {

        payload.posts.user = payload.posts.author;
        delete payload.posts.author;

        return this._super(store,primaryModelClass,payload,id,requestType);
    },

    normalizeArrayResponse(store,primaryModelClass,payload,id,requestType) {

        payload.posts.forEach((post) => {
        post.user = post.author;
        delete post.author;

        });

        return this._super(store,primaryModelClass,payload,id,requestType);
    }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<h3>If you type in URL /posts/139 - then it will include header-single component</h3>
    {{#if single}}
        {{header-single}}
    {{else}}
        {{header-global}}
    {{/if}}
    
<br>
{{global-navigation pages=pages}}
<br>
{{outlet}}
<br>
<br>

templates.components.global-navigation.hbs

{{#each pages as |page|}}
    <li>
        <a href="#">{{page.title.rendered}}</a>
    </li>          
{{/each}}
{{yield}}

templates.components.header-global.hbs

header global

templates.components.header-single.hbs

header single

templates.pages.hbs

Pages.hbs

{{global-navigation pages=pages}}

templates.posts.single.hbs

{{post.title.rendered}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0",
    "route-recognizer": "https://rawgit.com/tildeio/route-recognizer/56f5fcec6ae58d8e86b5dc77609809fb91198142/dist/route-recognizer.js",
    "FakeXMLHttpRequest": "https://rawgit.com/pretenderjs/FakeXMLHttpRequest/23c3a96b5b24f1bfe595867437e4f128a29c2840/fake_xml_http_request.js",
    "pretender": "https://rawgit.com/pretenderjs/pretender/c6de9afe18b1472aded2592f5a80ad9a26a0e262/pretender.js"
  },
  "addons": {}
}