Add static constructor method

Author: ivanvermeyen

README.md

@@ -59,11 +59,11 @@ But what if you are sending a custom key in a POST request and you want to valid
 
 Let's say you have a model with an ID of `1`, but `getRouteKey()` returns the encoded value of `1234`.
 
-In your validation rules, new up `\CodeZero\RouteKeyExists\RouteKeyExists` and pass the model's class name to the constructor:
+In your validation rules, pass your model's class name to `\CodeZero\RouteKeyExists\RouteKeyExists`:
 
 ```php
 request()->validate([
-    'model_id' => new RouteKeyExists(Model::class),
+    'model_id' => RouteKeyExists::model(Model::class),
 ]);
 ```
 
@@ -73,7 +73,7 @@ Possibly, you will need the actual ID to work with when validation passes. Tack
 
 ```php
 request()->validate([
-    'model_id' => (new RouteKeyExists(Model::class))->replace(),
+    'model_id' => RouteKeyExists::model(Model::class)->replace(),
 ]);
 
 $id = request('model_id');
@@ -83,7 +83,7 @@ Or maybe you want to keep the encoded ID in the request, but add the actual ID a
 
 ```php
 request()->validate([
-    'model_id' => (new RouteKeyExists(Model::class))->add('actual_id'),
+    'model_id' => RouteKeyExists::model(Model::class)->add('actual_id'),
 ]);
 
 $id = request('actual_id');

src/RouteKeyExists.php

@@ -36,6 +36,18 @@ class RouteKeyExists implements Rule
      */
     protected $addAttribute = null;
 
+    /**
+     * Create a new rule instance.
+     *
+     * @param string $model
+     *
+     * @return static
+     */
+    public static function model($model)
+    {
+        return new static($model);
+    }
+
     /**
      * Create a new rule instance.
      *

tests/RouteKeyExistsTest.php

@@ -24,7 +24,7 @@ public function setUp()
     public function it_resolves_a_model_with_custom_route_key()
     {
         $this->createRoute(
-            new RouteKeyExists(Model::class)
+            RouteKeyExists::model(Model::class)
         );
 
         $this->validate('foo-9999')
@@ -42,7 +42,7 @@ public function it_resolves_a_model_with_custom_route_key()
     public function it_replaces_the_route_key_in_the_request_with_the_original_route_key()
     {
         $this->createRoute(
-            (new RouteKeyExists(Model::class))->replace()
+            RouteKeyExists::model(Model::class)->replace()
         );
 
         $response = $this->validate("foo-{$this->model->id}")
@@ -57,7 +57,7 @@ public function it_replaces_the_route_key_in_the_request_with_the_original_route
     public function it_adds_the_original_route_key_to_the_request()
     {
         $this->createRoute(
-            (new RouteKeyExists(Model::class))->add('database_key')
+            RouteKeyExists::model(Model::class)->add('database_key')
         );
 
         $response = $this->validate("foo-{$this->model->id}")