GII generates rules for unique indexes

extensions/yii/gii/generators/model/Generator.php

@@ -13,6 +13,7 @@ use yii\db\Connection;
 use yii\db\Schema;
 use yii\gii\CodeFile;
 use yii\helpers\Inflector;
+use yii\base\NotSupportedException;
 
 /**
  * This generator will generate one or multiple ActiveRecord classes for the specified database table.
@@ -247,7 +248,24 @@ class Generator extends \yii\gii\Generator
 		foreach ($lengths as $length => $columns) {
 			$rules[] = "[['" . implode("', '", $columns) . "'], 'string', 'max' => $length]";
 		}
-
+		// Unique indexes rules
+		try {
+			$db = $this->getDbConnection();
+			$uniqueIndexes = $db->getSchema()->findUniqueIndexes($table);
+			foreach ($uniqueIndexes as $indexName => $uniqueColumns) {
+				$attributesCount = count($uniqueColumns);
+				if ($attributesCount == 1) {
+					$rules[] = "['" . $uniqueColumns[0] . "', 'unique']";
+				} elseif ($attributesCount > 1) {
+					$labels = array_intersect_key($this->generateLabels($table), array_flip($uniqueColumns));
+					$lastLabel = array_pop($labels);
+					$columnsList = implode("', '", $uniqueColumns);
+					$rules[] = "[['" . $columnsList . "'], 'unique', 'targetAttribute' => ['" . $columnsList . "'], 'message' => 'The combination of " . implode(', ', $labels) . " and " . $lastLabel . " has already been taken.']";
+				}
+			}
+		} catch (NotSupportedException $e) {
+			// doesn't support unique indexes information...do nothing
+		}
 		return $rules;
 	}