gistfile1.php

<?php
        $controllerMock = $this->_getMock($sessionParams, $controller, [], $requestData);

        $Listings = TableRegistry::get('Listings');
        $controllerMock->Listings = $Listings;
        $listing = $controllerMock->Listings->newEntity();

        $listing = $controllerMock->_updateEntity($requestData, $listing);

        $listing = $controllerMock->_saveData($listing);


        $listing = $controllerMock->Listings->get($listing->id, [
            'contain' => ['Facilities.Location']
        ]);

        $data = $listing->toArray();

        $data['facility']['location']['name'] = 'A Newer Name';
        $data['facility']['storage_fee'] = 1000;

        $listing = $controllerMock->_updateEntity($data, $listing);

        $listing->dirty(true);
        $listing->facility->dirty(true);
        $listing->facility->location->dirty(true);

        $listing = $controllerMock->_saveData($listing);

gistfile2.php

public function _updateEntity($data, $listing)
    {
        $listing = $this->Listings->patchEntity($listing, $data, [
            'associated' => $this->_getAssociatedArray()
        ]);

        return $listing;
    }

    public function _saveData($listing)
    {
        $listing->dirty(true);
        if ($this->Listings->save($listing, [
            'associated' => $this->_getAssociatedArray(),
            'user_id' => $this->Auth->user('id') // This needs to be set for the logging mechanism so I know who saved the listing
        ])) {
            $error = false;
            $listing->publishable = $this->isListingPublishable($listing->id);
        } else {
            $this->response->statusCode('400', 'Bad request. Are you sure you filled out all the correct fields? Try unpublishing and try again.');
            $errors = $listing->errors();
            $listing = $this->request->data;
            $listing['publishable'] = $errors;
        }

        return $listing;
    }

    private function _getAssociatedArray()
    {
        return [
            'Facilities' => [
                'accessibleFields' => ['id'],
                'associated' => [
                    'FacilityContactMethods',
                    'Location' => [
                        'accessibleFields' => ['id']
                    ]
                ]
            ], 'TruckDetails', 'TrailerDetails', 'RvDetails',
            'CraneDetails', 'BoatDetails', 'AutoDetails', 'Transmissions', 'Engines', 'AxleDetails', 'SpecDetails',
            'TireDetails', 'Photos'
        ];
    }

gistfile3.php

<?php
$requestData = [
  'title' => 'My Big Fat Big Truck',
  'public' => false,
  'unlisted' => false,
  'internal' => false,
  'facility' => [
      'storage_fee' => 500,
      'location' => [
          'name' => 'East over West',
          'state' => 'VA'
      ]
  ]
];

gistfile4.php

<?php 
// ListingsTable
$this->hasOne('Facilities', [
    'foreignKey' => 'listing_id',
    'dependent' => true,
    'cascadeCallbacks' => true
]);

// FacilitiesTable

$this->belongsTo('Location', [
    'className' => 'Locations'
]);

// LocationsTable

$this->hasMany('Facilities', [
    'foreignKey' => 'location_id'
]);