handle prefix update on route level prefix

Author: taylorotwell

src/Illuminate/Routing/Route.php

@@ -146,13 +146,13 @@ public function __construct($methods, $uri, $action)
     {
         $this->uri = $uri;
         $this->methods = (array) $methods;
-        $this->action = $this->parseAction($action);
+        $this->action = Arr::except($this->parseAction($action), ['prefix']);
 
         if (in_array('GET', $this->methods) && ! in_array('HEAD', $this->methods)) {
             $this->methods[] = 'HEAD';
         }
 
-        $this->prefix($this->action['prefix'] ?? '');
+        $this->prefix(is_array($action) ? Arr::get($action, 'prefix') : '');
     }
 
     /**
@@ -709,11 +709,26 @@ public function getPrefix()
      */
     public function prefix($prefix)
     {
+        $this->updatePrefixOnAction($prefix);
+
         $uri = rtrim($prefix, '/').'/'.ltrim($this->uri, '/');
 
         return $this->setUri($uri !== '/' ? trim($uri, '/') : $uri);
     }
 
+    /**
+     * Update the "prefix" attribute on the action array.
+     *
+     * @param  string  $prefix
+     * @return void
+     */
+    protected function updatePrefixOnAction($prefix)
+    {
+        if (! empty($newPrefix = trim(rtrim($prefix, '/').'/'.ltrim($this->action['prefix'] ?? '', '/'), '/'))) {
+            $this->action['prefix'] = $newPrefix;
+        }
+    }
+
     /**
      * Get the URI associated with the route.
      *

tests/Integration/Routing/CompiledRouteCollectionTest.php

@@ -408,6 +408,15 @@ public function testSlashPrefixIsProperlyHandled()
         $this->assertSame('foo/bar', $route->uri());
     }
 
+    public function testGroupPrefixAndRoutePrefixAreProperlyHandled()
+    {
+        $this->routeCollection->add($this->newRoute('GET', 'foo/bar', ['uses' => 'FooController@index', 'prefix' => '{locale}'])->prefix('pre'));
+
+        $route = $this->collection()->getByAction('FooController@index');
+
+        $this->assertSame('pre/{locale}', $route->getPrefix());
+    }
+
     public function testRouteBindingsAreProperlySaved()
     {
         $this->routeCollection->add($this->newRoute('GET', 'posts/{post:slug}/show', [