fix primary key being ignored when creating resources using PUT requests

Author: jarischaefer

src/Jarischaefer/HalApi/Controllers/HalApiResourceController.php

@@ -101,21 +101,21 @@ public function __construct(HalApiControllerParameters $parameters, HalApiTransf
 	 */
 	public static function getModelBindingCallback()
 	{
-		return function () {
+		return function ($value) {
 			switch (\Request::getMethod()) {
 				case Request::METHOD_GET:
 					throw new NotFoundHttpException;
 				case Request::METHOD_POST:
 					throw new NotFoundHttpException;
 				case Request::METHOD_PUT:
-					return null;
+					return $value;
 				case Request::METHOD_PATCH:
 					throw new NotFoundHttpException;
 				case Request::METHOD_DELETE:
 					throw new NotFoundHttpException;
+				default:
+					return null;
 			}
-
-			return null;
 		};
 	}
 
@@ -233,10 +233,14 @@ public function store()
 	/**
 	 * @inheritdoc
 	 */
-	public function update($model = null)
+	public function update($model)
 	{
 		/** @var Model $model */
-		$model = $model ?: new $this->model;
+		if (!($model instanceof Model)) {
+			$id = $model;
+			$model = new $this->model;
+			$model->{$model->getKeyName()} = $id;
+		}
 
 		switch ($this->request->getMethod()) {
 			case Request::METHOD_PUT:

src/Jarischaefer/HalApi/Controllers/HalApiResourceControllerContract.php

@@ -2,6 +2,7 @@
 
 use Exception;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Http\Request;
 use Jarischaefer\HalApi\Exceptions\BadPostRequestException;
 use Jarischaefer\HalApi\Exceptions\BadPutRequestException;
 use Jarischaefer\HalApi\Exceptions\DatabaseConflictException;
@@ -96,12 +97,12 @@ public function store();
 	 * Handles PUT and PATCH requests trying to create or update a model. Parameters are taken from the JSON request
 	 * body. PUT requests must contain all fillable attributes.
 	 *
-	 * @param null $model
+	 * @param Model|mixed $model
 	 * @return array
 	 * @throws BadPutRequestException
 	 * @throws DatabaseSaveException
 	 */
-	public function update($model = null);
+	public function update($model);
 
 	/**
 	 * @param $model