Fixes #4970: joinWith() called by a relation was ignored by yii\db\ActiveQuery

framework/CHANGELOG.md

@@ -91,6 +91,7 @@ Yii Framework 2 Change Log
 - Bug #4880: Return value of yii\web\Request::getPrefferedLanguage() was a normalized value instead of a valid language value from the input array (cebe)
 - Bug #4920: `yii\filters\auth\CompositeAuth` should not trigger error as long as one of the methods succeeds (qiangxue)
 - Bug #4954: MSSQL column comments are not retrieved correctly (SerjRamone)
+- Bug #4970: `joinWith()` called by a relation was ignored by `yii\db\ActiveQuery` (stepanselyuk)
 - Bug: Fixed inconsistent return of `\yii\console\Application::runAction()` (samdark)
 - Bug: URL encoding for the route parameter added to `\yii\web\UrlManager` (klimov-paul)
 - Bug: Fixed the bug that requesting protected or private action methods would cause 500 error instead of 404 (qiangxue)

framework/db/ActiveQuery.php

@@ -482,9 +482,9 @@ class ActiveQuery extends Query implements ActiveQueryInterface
                 $relations[$fullName] = $relation = $primaryModel->getRelation($name);
                 if ($callback !== null) {
                     call_user_func($callback, $relation);
-                    if(is_array($relation->joinWith)) {
-                        $relation->buildJoinWith();
-                    }
+                }
+                if (!empty($relation->joinWith)) {
+                    $relation->buildJoinWith();
                 }
                 $this->joinWithRelation($parent, $relation, $this->getJoinType($joinType, $fullName));
             }