fix

Author: tobyzerner

src/Laravel/Filter/WhereCount.php

@@ -3,6 +3,7 @@
 namespace Tobyz\JsonApiServer\Laravel\Filter;
 
 use Tobyz\JsonApiServer\Context;
+use Tobyz\JsonApiServer\Exception\BadRequestException;
 use Tobyz\JsonApiServer\Schema\Filter;
 
 class WhereCount extends Filter
@@ -29,6 +30,10 @@ public static function make(string $name): static
     public function apply(object $query, array|string $value, Context $context): void
     {
         foreach ($this->resolveOperators($value) as $operator => $val) {
+            if (!is_scalar($val)) {
+                throw new BadRequestException('Count filters require a single value');
+            }
+
             $query->whereHas(
                 $this->relationship ?: $this->name,
                 $this->scope ? fn($query) => ($this->scope)($query, $context) : null,

src/Laravel/Filter/WhereHas.php

@@ -59,7 +59,14 @@ public function apply(object $query, array|string $value, Context $context): voi
         $value = $this->resolveOperators($value);
 
         foreach ($value as $operator => $v) {
-            $method = in_array($operator, ['ne', 'notin', 'null']) ? 'whereDoesntHave' : 'whereHas';
+            $method = match ($operator) {
+                'ne', 'notin' => 'whereDoesntHave',
+                'null', 'notnull' => ($operator === 'null' xor
+                !filter_var($v, FILTER_VALIDATE_BOOLEAN))
+                    ? 'whereDoesntHave'
+                    : 'whereHas',
+                default => 'whereHas',
+            };
 
             $query->{$method}($field->property ?: $field->name, function ($query) use (
                 $operator,