Replace usage of resolve() helper with Lumen-compatible app()

CHANGELOG.md

@@ -17,7 +17,8 @@ You can find and compare releases at the [GitHub release page](https://github.co
 ### Fixed
 
 - Fix nested mutations with multiple `belongsTo` relations at the same level https://github.com/nuwave/lighthouse/pull/1285
-- Avoid race condition that occurs when using `Cache::has()` https://github.com/nuwave/lighthouse/pull/1290Adds
+- Avoid race condition that occurs when using `Cache::has()` https://github.com/nuwave/lighthouse/pull/1290
+- Replace usage of `resolve()` helper with Lumen-compatible `app()` https://github.com/nuwave/lighthouse/pull/1305
 
 ### Changed
 

src/Schema/Directives/RulesDirective.php

@@ -58,7 +58,7 @@ public function rules(): array
         // resolve any given rule where a corresponding class exists.
         foreach ($rules as $key => $rule) {
             if (class_exists($rule)) {
-                $rules[$key] = resolve($rule);
+                $rules[$key] = app($rule);
             }
         }
 

src/Schema/Directives/RulesForArrayDirective.php

@@ -54,7 +54,7 @@ public function rules(): array
         // resolve any given rule where a corresponding class exists.
         foreach ($rules as $key => $rule) {
             if (class_exists($rule)) {
-                $rules[$key] = resolve($rule);
+                $rules[$key] = app($rule);
             }
         }