Update: add unique rule to validator

Inception/Http/Request/Validators/Rules/UniqueRule.php

+<?php
+
+namespace Snaju\Inception\Http\Request\Validators\Rules;
+
+use Snaju\Inception\Exception\InvalidArgumentException;
+use Snaju\Inception\Http\Request\Validators\ValidatorRule;
+use Snaju\Inception\ORM\DataModel;
+use Snaju\Inception\ORM\ORM;
+
+class UniqueRule extends ValidatorRule
+{
+
+    public function isValid($dataArray): bool
+    {
+        $valid = $this->optional;
+        $bodyData = $dataArray['body'];
+
+        if (array_key_exists($this->field, $bodyData)) {
+            $count = 0;
+            $parts = explode(',', $this->ruleValue);
+            $tableName = $parts[0];
+
+            // If namespace is provided, get the table name from the class
+            if (str_contains($this->ruleValue, '\\')) {
+                $namespace = $parts[0];
+                $class = new $namespace;
+
+                if (! $class instanceof DataModel) {
+                    throw new InvalidArgumentException("$namespace is not a valid namespace. Model must extend Snaju\Inception\ORM\DataModal");
+                }
+
+                $tableName = ORM::getEntityManager()->getClassMetadata($namespace)->getTableName();
+            }
+
+            // Get list of table names and ensure a correct table name is used
+            $sm = ORM::getEntityManager()->getConnection()->getSchemaManager();
+            $tables = array_map(function($table) {
+                return $table->getname();
+            }, $sm->listTables());
+
+            if (! in_array($tableName, $tables)) {
+                throw new InvalidArgumentException("`$tableName` is not a valid table name. Check model to ensure correct table name is used.");
+            }
+
+            // Create and run the query to check the count
+            $columnName = isset($parts[1]) ? $parts[1] : $this->field;
+            $q = "SELECT COUNT(*) FROM $tableName WHERE $columnName = '{$bodyData[$this->field]}'";
+            $stmt = ORM::getEntityManager()->getConnection()->prepare($q);
+            $count = (int)$stmt->executeQuery()->fetchNumeric()[0];
+
+            if ($count <= 0) {
+                $valid = true;
+            }
+                else {
+                    $valid = false;
+                }
+        }
+
+        return $valid;
+    }
+
+    public function getErrorMessage(): string
+    {
+        return "`{$this->field}` must be unique. Another record has the same value for {$this->field}.";
+    }
+
+    public function stopOnError(): bool
+    {
+        return false;
+    }
+
+}
\ No newline at end of file

Inception/Http/Request/Validators/Validator.php

@@ -19,6 +19,7 @@ use Snaju\Inception\Http\Request\Validators\Rules\RequiredRule;
 use Snaju\Inception\Http\Request\Validators\Rules\StringRule;
 use Snaju\Inception\Exception\InvalidArgumentException;
 use Snaju\Inception\Exception\InvalidKeyException;
+use Snaju\Inception\Http\Request\Validators\Rules\UniqueRule;
 use Snaju\Inception\Http\Request\WebRequest;
 use Snaju\Inception\InceptionCore;
 use Snaju\Inception\Util\Loaders\Collection;
@@ -61,6 +62,7 @@ class Validator implements ValidatorInterface
             'present'       => PresentRule::class, // should be first in validator string, bails if fail
             'required'      => RequiredRule::class, // should be first in validator string, bails if fail
             'string'        => StringRule::class,
+            'unique'        => UniqueRule::class,
         ]);
 
         $this->rules = $rules;