fix model binding when cached

Author: taylorotwell

src/Illuminate/Routing/AbstractRouteCollection.php

@@ -146,6 +146,7 @@ public function compile()
                 'fallback' => $route->isFallback,
                 'defaults' => $route->defaults,
                 'wheres' => $route->wheres,
+                'bindingFields' => $route->bindingFields(),
             ];
         }
 

src/Illuminate/Routing/CompiledRouteCollection.php

@@ -70,6 +70,7 @@ public function add(Route $route)
             'fallback' => $route->isFallback,
             'defaults' => $route->defaults,
             'wheres' => $route->wheres,
+            'bindingFields' => $route->bindingFields(),
         ];
 
         $this->compiled = [];
@@ -244,6 +245,7 @@ protected function newRoute(array $attributes)
             ->setFallback($attributes['fallback'])
             ->setDefaults($attributes['defaults'])
             ->setWheres($attributes['wheres'])
+            ->setBindingFields($attributes['bindingFields'])
             ->setRouter($this->router)
             ->setContainer($this->container);
     }

src/Illuminate/Routing/Route.php

@@ -488,6 +488,29 @@ public function bindingFieldFor($parameter)
         return $this->bindingFields[$parameter] ?? null;
     }
 
+    /**
+     * Get the binding fields for the route.
+     *
+     * @return array
+     */
+    public function bindingFields()
+    {
+        return $this->bindingFields ?? [];
+    }
+
+    /**
+     * Set the binding fields for the route.
+     *
+     * @param  array  $bindingFields
+     * @return $this
+     */
+    public function setBindingFields(array $bindingFields)
+    {
+        $this->bindingFields = $bindingFields;
+
+        return $this;
+    }
+
     /**
      * Get the parent parameter of the given parameter.
      *