QPs

adapters.pipeline\.js

import RESTAdapter from '@ember-data/adapter/rest';

export default class PipelineAdapter extends RESTAdapter {
  findAll() {
    return {
      pipelines: [{
        id: 1,
        name: 'Pipeline 1'
      }, {
        id: 2,
        name: 'Pipeline 2'
      }]
    };
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {

}

controllers.pipeline\.js

import Controller from '@ember/controller';
import { inject } from '@ember/service';
import { tracked } from '@glimmer/tracking';

export default class extends Controller {
  @inject store;
  
  queryParams = ['pipeline'];
  
  @tracked pipelines;
  @tracked pipeline;
  
  get pipelineModel() {
    return this.store.peekRecord('pipeline', this.pipeline)
      ?? this.defaultPipeline;
  } 
    
  get defaultPipeline() {
    return this.store.peekRecord('pipeline', 1); 
  }
}

models.pipeline\.js

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

export default class extends Model {
  @attr() name;
}

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

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

Router.map(function() {
  this.route('pipeline');
});

export default Router;

routes.application\.js

import Route from '@ember/routing/route';

export default class ApplicationRoute extends Route {}

routes.pipeline\.js

import Route from '@ember/routing/route';
import { inject } from '@ember/service';

export default class PipelineRoute extends Route {
  @inject store;
  
  queryParams = {
    pipeline: {
      refreshModel: true
    }
  }

  model() {
    // Make sure the pipelines are all in the client
    return this.store.findAll('pipeline'); 
  }

  setupController(controller, pipelines) {
    super.setupController(...arguments);
    
    controller.pipelines = pipelines; 
  }
}

serializers.pipeline\.js

import RESTSerializer from '@ember-data/serializer/rest';

export default class PipelineSerializer extends RESTSerializer {
 
}

templates.application\.hbs

<LinkTo @route="application">Home</LinkTo>
|
<LinkTo @route="pipeline">Pipeline (No QP)</LinkTo>
|
<LinkTo @route="pipeline" @query={{hash pipeline=2}}>Pipeline 2</LinkTo>
|
<LinkTo @route="pipeline" @query={{hash pipeline=404}}>Pipeline 404</LinkTo>

<br><br>

{{outlet}}

templates.pipeline\.hbs

{{this.pipelineModel.id}} - {{this.pipelineModel.name}}

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "3.18.0"
  }
}