Add ArrayExpression support in related tables

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.16 under development
 ------------------------
 
+- Bug #16966: Fix ArrayExpression support in related tables (GHopperMSK)
 - Bug #16028: Fix serialization of complex cache keys that contain non-UTF sequences (rugabarbo)
 - Bug #16945: Fixed RBAC DbManager ruleName fetching on the case of PDO::ATTR_ORACLE_NULLS => PDO::NULL_TO_STRING (razonyang)
 - Bug #16081: Fixed composite IN using just one column (rugabarbo)

framework/db/ActiveRelationTrait.php

@@ -525,6 +525,8 @@ trait ActiveRelationTrait
                 if (($value = $model[$attribute]) !== null) {
                     if (is_array($value)) {
                         $values = array_merge($values, $value);
+                    } elseif(($value instanceof ArrayExpression) && ($value->getDimension() === 1)) {
+                        $values = array_merge($values, $value->getValue());
                     } else {
                         $values[] = $value;
                     }