Accessing the store from model function in routes

I want to be able to set my model dynamically depending on a record in the store - mainly because I want to control whether or not a form submission should be a POST or PUT.

export default Ember.Route.extend({
  model: function() {
    let bankAccount = this.store.get('bankAccount').objectAt(0);

    if (bankAccount.is_connected) {
      bankAccount = this.store.createRecord('bankAccount', { account_label: 'new' });
    }

    return Ember.RSVP.hash({
      appState: this.get('appStates').currentAppState(),
      user: this.store.findAll('user').thenGetFirst(),
      bankAccount: bankAccount,
    });
  },
});

The issue is that let bankAccount = this.store.get('bankAccount').objectAt(0); return null when I refresh the page.

However, if I run App.store.get('bankAccount').objectAt(0) in my browser console, it returns the correct record.

What am I doing incorrectly?