add withRelationsCount and withRelationsExistence on get

Author: Marius

README.md

@@ -180,7 +180,7 @@ The above "errors" are optional and appear only for validation errors while "mes
 
 
 #### III.2 Get resource
-**GET** /{resource}/{identifier}?withRelations[]=has_many_relation&withRelations[]=has_one_relation
+**GET** /info/{resource}/{identifier}?withRelations[]=has_manyRelation&withRelations[]=has_oneRelation&withRelationsCount[]=has_manyRelation&withRelationsExistence[]=has_manyRelation
 
 headers:
 
@@ -211,6 +211,8 @@ Json Response:
                 }
             }
         ],
+        "has_manyRelation_count": 0,
+        "has_manyRelation_exist": false,
     }
 
 400:

src/Http/Controllers/ResourceControllerTrait.php

@@ -99,12 +99,27 @@ public function get(string $identifier, Request $request): JsonResponse
     {
         try {
             $this->throwIfForbidden($this->forbidGet);
+            $baseModel = $this->resourceService->get(
+                $identifier,
+                $this->getFilteredRelations((array)$request->get('withRelations'))
+            );
+            $result = $baseModel->toArray();
+            $countRelations = $this->getFilteredRelations((array)$request->get('withRelationsCount'));
+
+            foreach ($countRelations as $relationName) {
+                $result[$relationName . ListFilterBuilder::COUNT_ALIAS_POSTFIX] ??=
+                    $baseModel->{$relationName}()->count();
+            }
+
+            foreach ($this->getFilteredRelations((array)$request->get('withRelationsExistence')) as $relationName) {
+                $result[$relationName . '_exist'] ??= \in_array($relationName, $countRelations, true) &&
+                    \is_int($result[$relationName . ListFilterBuilder::COUNT_ALIAS_POSTFIX] ?? null) ?
+                    $result[$relationName . ListFilterBuilder::COUNT_ALIAS_POSTFIX] > 0 :
+                    $baseModel->{$relationName}()->exists();
+            }
 
             return GeneralHelper::app(JsonResponse::class, [
-                'data' => $this->resourceService->get(
-                    $identifier,
-                    $this->getFilteredRelations((array)$request->get('withRelations'))
-                )->toArray(),
+                'data' => $result,
                 'status' => 200
             ]);
         } catch (\Throwable $e) {