Add can, cant and cannot methods to the Role model

src/Database/Authorizable.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Silber\Bouncer\Database;
+
+use Silber\Bouncer\Clipboard;
+use Illuminate\Container\Container;
+
+trait Authorizable
+{
+    /**
+     * Determine if the authority has a given ability.
+     *
+     * @param  string  $ability
+     * @param  \Illuminate\Database\Eloquent\Model|null  $model
+     * @return bool
+     */
+    public function can($ability, $model = null)
+    {
+        return $this->getClipboardInstance()->check($this, $ability, $model);
+    }
+
+    /**
+     * Determine if the authority does not have a given ability.
+     *
+     * @param  string  $ability
+     * @param  \Illuminate\Database\Eloquent\Model|null  $model
+     * @return bool
+     */
+    public function cant($ability, $model = null)
+    {
+        return ! $this->can($ability, $model);
+    }
+
+    /**
+     * Determine if the authority does not have a given ability.
+     *
+     * @param  string  $ability
+     * @param  \Illuminate\Database\Eloquent\Model|null  $model
+     * @return bool
+     */
+    public function cannot($ability, $model = null)
+    {
+        return $this->cant($ability, $model);
+    }
+
+    /**
+     * Get an instance of the bouncer's clipboard.
+     *
+     * @return \Silber\Bouncer\Clipboard
+     */
+    protected function getClipboardInstance()
+    {
+        $container = Container::getInstance() ?: new Container;
+
+        return $container->make(Clipboard::class);
+    }
+}

src/Database/Role.php

@@ -10,7 +10,9 @@
 
 class Role extends Model
 {
-    use HasAbilities;
+    use HasAbilities, Authorizable {
+        HasAbilities::getClipboardInstance insteadof Authorizable;
+    }
 
     /**
      * The attributes that are mass assignable.

tests/AuthorizableTest.php

@@ -0,0 +1,17 @@
+<?php
+
+use Silber\Bouncer\Database\Role;
+
+class AuthorizableTest extends BaseTestCase
+{
+    public function testCheckingAbilitiesOnRole()
+    {
+        $role = Role::create(['name' => 'admin']);
+
+        $role->allow('scream');
+
+        $this->assertTrue($role->can('scream'));
+        $this->assertTrue($role->cant('shout'));
+        $this->assertTrue($role->cannot('cry'));
+    }
+}