- Minor code cleaning

src/Repository.php

@@ -158,26 +158,20 @@ class Repository implements RepositoryInterface
             throw new \Exception("Your entity class `" . get_class($entity) . "` cannot match entity type of repository `{$this->entityClass}`");
         }
 
-        $primaryKeyDefinition = Ulmus::resolveEntity($this->entityClass)->getPrimaryKeyField();
-
-        if ( $primaryKeyDefinition !== null ) {
+        if ($primaryKeyDefinition = Ulmus::resolveEntity($this->entityClass)->getPrimaryKeyField()) {
             $pkField = key($primaryKeyDefinition);
 
             $this->eventExecute(Event\Query\Delete::class, $this, $entity);
 
             return $this->deleteFromPk($entity->$pkField);
         }
+        elseif ($compoundKeyFields = Ulmus::resolveEntity($this->entityClass)->getCompoundKeyFields()) {
+            $this->eventExecute(Event\Query\Delete::class, $this, $entity);
+
+            return $this->deleteFromCompoundKeys(array_combine($compoundKeyFields->column, array_map(fn($column) => $entity->$column, $compoundKeyFields->column)));
+        }
         else {
-            $compoundKeyFields = Ulmus::resolveEntity($this->entityClass)->getCompoundKeyFields();
-
-            if ($compoundKeyFields) {
-                $this->eventExecute(Event\Query\Delete::class, $this, $entity);
-
-                return $this->deleteFromCompoundKeys(array_combine($compoundKeyFields->column, array_map(fn($column) => $entity->$column, $compoundKeyFields->column)));
-            }
-            else {
-                throw new \Exception(sprintf("No primary key found for entity %s", $this->entityClass));
-            }
+            throw new \Exception(sprintf("No primary key found for entity %s", $this->entityClass));
         }
     }