fix: revert Traditional is_unique() is_not_unique() implementation

If we use Strict Rules, the behavior may change.

Author: kenjis

system/Validation/Rules.php

@@ -11,7 +11,6 @@
 
 namespace CodeIgniter\Validation;
 
-use CodeIgniter\Validation\StrictRules\Rules as StrictRules;
 use Config\Database;
 use InvalidArgumentException;
 
@@ -20,15 +19,6 @@
  */
 class Rules
 {
-    private ?StrictRules $strictRules = null;
-
-    private function createStrictRules(): void
-    {
-        if ($this->strictRules === null) {
-            $this->strictRules = new StrictRules();
-        }
-    }
-
     /**
      * The value does not match another field in $data.
      *
@@ -95,9 +85,23 @@ public function greater_than_equal_to(?string $str, string $min): bool
      */
     public function is_not_unique(?string $str, string $field, array $data): bool
     {
-        $this->createStrictRules();
+        // Grab any data for exclusion of a single row.
+        [$field, $whereField, $whereValue] = array_pad(explode(',', $field), 3, null);
+
+        // Break the table and field apart
+        sscanf($field, '%[^.].%[^.]', $table, $field);
+
+        $row = Database::connect($data['DBGroup'] ?? null)
+            ->table($table)
+            ->select('1')
+            ->where($field, $str)
+            ->limit(1);
 
-        return $this->strictRules->is_not_unique($str, $field, $data);
+        if (! empty($whereField) && ! empty($whereValue) && ! preg_match('/^\{(\w+)\}$/', $whereValue)) {
+            $row = $row->where($whereField, $whereValue);
+        }
+
+        return $row->get()->getRow() !== null;
     }
 
     /**
@@ -121,9 +125,21 @@ public function in_list(?string $value, string $list): bool
      */
     public function is_unique(?string $str, string $field, array $data): bool
     {
-        $this->createStrictRules();
+        [$field, $ignoreField, $ignoreValue] = array_pad(explode(',', $field), 3, null);
+
+        sscanf($field, '%[^.].%[^.]', $table, $field);
+
+        $row = Database::connect($data['DBGroup'] ?? null)
+            ->table($table)
+            ->select('1')
+            ->where($field, $str)
+            ->limit(1);
+
+        if (! empty($ignoreField) && ! empty($ignoreValue) && ! preg_match('/^\{(\w+)\}$/', $ignoreValue)) {
+            $row = $row->where("{$ignoreField} !=", $ignoreValue);
+        }
 
-        return $this->strictRules->is_unique($str, $field, $data);
+        return $row->get()->getRow() === null;
     }
 
     /**