Loading model on param route - ember.js

Question

I've successfully build out my app to have a proper child route and it works as it should when the user navigates through the site, but on load straight to the show route (exhibitions/slug) ember data seems to break; however, I'm still getting the proper response from the API. Here is my code, hope it makes sense..
routes/exhibitions
import Route from '#ember/routing/route';
const { set } = Ember;
export default Route.extend({
model() {
return this.store.findAll('exhibition');
},
setupController(controller, model) {
set(controller, 'exhibitions', model);
}
});
routes/exhibition
import Ember from 'ember';
const { get, set } = Ember;
export default Ember.Route.extend({
model(params) {
return this.store.queryRecord('exhibition', {
'fields.slug': params.exhibition_slug
});
},
serialize(model) {
return { exhibition_slug: get(model, 'slug') };
},
setupController(controller, model) {
set(controller, 'exhibition', model);
}
});
model for exhibition
import Contentful from 'ember-data-contentful/models/contentful';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';
export default Contentful.extend({
title: attr('string'),
body: attr('string'),
slug: attr('string')
});
router.js
import EmberRouter from '#ember/routing/router';
import config from './config/environment';
const Router = EmberRouter.extend({
location: config.locationType,
rootURL: config.rootURL
});
Router.map(function() {
this.route('homepage', { path: '/' });
this.route('exhibitions');
this.route('exhibition', { path: 'exhibitions/:exhibition_slug'});
});
export default Router;
Here is the JSON response (apologies for poor formatting)
{sys: {type: "Array"}, total: 1, skip: 0, limit: 1, items: [{,…}]}
items
:
[{,…}]
0
:
{,…}
fields
:
{title: "Hello", body: "This is the body.", slug: "hello"}
body
:
"This is the body."
slug
:
"hello"
title
:
"Hello"
sys
:
{space: {sys: {type: "Link", linkType: "Space", id: "kw98h7kialqf"}}, id: "5rllAHKFygCOma2wgy6WuI",…}
contentType
:
{sys: {type: "Link", linkType: "ContentType", id: "exhibition"}}
createdAt
:
"2018-02-20T15:48:08.093Z"
id
:
"5rllAHKFygCOma2wgy6WuI"
locale
:
"en-US"
revision
:
2
space
:
{sys: {type: "Link", linkType: "Space", id: "kw98h7kialqf"}}
type
:
"Entry"
updatedAt
:
"2018-02-20T15:52:19.063Z"
limit
:
1
skip
:
0
sys
:
{type: "Array"}
type
:
"Array"
total
:
1
The error I'm getting in the console is:
Error while processing route: exhibition Cannot read property 'Entry' of undefined TypeError: Cannot read property 'Entry' of undefined
Let me know if anything else is needed!! Thank you!