fix(laravel): index on non-primary key (#7183)

fixes #7182

Author: soyuka

src/Laravel/Eloquent/Metadata/ModelMetadata.php

@@ -101,12 +101,12 @@ public function getAttributes(Model $model): Collection
     }
 
     /**
-     * @param array<int, array{columns: string[]}> $indexes
+     * @param array<int, array{columns: string[], primary?: bool}> $indexes
      */
     private function isColumnPrimaryKey(array $indexes, string $column): bool
     {
         foreach ($indexes as $index) {
-            if (\in_array($column, $index['columns'], true)) {
+            if (\in_array($column, $index['columns'], true) && (true === ($index['primary'] ?? false))) {
                 return true;
             }
         }