Updated yii2 requirements to 2.0.14 or later

Some refactoring

composer.json

@@ -21,7 +21,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": ">=2.0.7"
+        "yiisoft/yii2": ">=2.0.14"
     },
     "require-dev": {
         "phpunit/phpunit": "4.8.36"

src/SaveRelationsBehavior.php

@@ -8,6 +8,7 @@ use yii\base\Behavior;
 use yii\base\Exception;
 use yii\base\ModelEvent;
 use yii\base\UnknownPropertyException;
+use yii\db\ActiveQueryInterface;
 use yii\db\BaseActiveRecord;
 use yii\db\Exception as DbException;
 use yii\db\Transaction;
@@ -109,7 +110,7 @@ class SaveRelationsBehavior extends Behavior
     public function __set($name, $value)
     {
         if (in_array($name, $this->_relations)) {
-            Yii::trace("Setting {$name} relation value", __METHOD__);
+            Yii::debug("Setting {$name} relation value", __METHOD__);
             if (!isset($this->_oldRelationValue[$name])) {
                 if ($this->owner->isNewRecord) {
                     if ($this->owner->getRelation($name)->multiple === true) {
@@ -247,7 +248,7 @@ class SaveRelationsBehavior extends Behavior
                     if (array_key_exists($relationName, $this->_oldRelationValue)) { // Relation was not set, do nothing...
                         $relation = $model->getRelation($relationName);
                         if ($relation->multiple === false && !empty($model->{$relationName})) {
-                            Yii::trace("Setting foreign keys for {$relationName}", __METHOD__);
+                            Yii::debug("Setting foreign keys for {$relationName}", __METHOD__);
                             foreach ($relation->link as $relatedAttribute => $modelAttribute) {
                                 if ($model->{$modelAttribute} !== $model->{$relationName}->{$relatedAttribute}) {
                                     $model->{$modelAttribute} = $model->{$relationName}->{$relatedAttribute};
@@ -333,7 +334,7 @@ class SaveRelationsBehavior extends Behavior
     {
         $this->validateRelationModel($pettyRelationName, $relationName, $model, $event);
         if ($event->isValid && (count($model->dirtyAttributes) || $model->isNewRecord)) {
-            Yii::trace("Saving {$pettyRelationName} relation model", __METHOD__);
+            Yii::debug("Saving {$pettyRelationName} relation model", __METHOD__);
             $model->save(false);
         }
     }
@@ -353,7 +354,7 @@ class SaveRelationsBehavior extends Behavior
             if (key_exists($relationName, $this->_relationsScenario)) {
                 $relationModel->setScenario($this->_relationsScenario[$relationName]);
             }
-            Yii::trace("Validating {$pettyRelationName} relation model using " . $relationModel->scenario . " scenario", __METHOD__);
+            Yii::debug("Validating {$pettyRelationName} relation model using " . $relationModel->scenario . " scenario", __METHOD__);
             if (!$relationModel->validate()) {
                 $this->_addError($relationModel, $model, $relationName, $pettyRelationName);
             }
@@ -395,7 +396,7 @@ class SaveRelationsBehavior extends Behavior
      */
     public function afterSave()
     {
-        if ($this->_relationsSaveStarted == false) {
+        if ($this->_relationsSaveStarted === false) {
             /** @var BaseActiveRecord $model */
             $model = $this->owner;
             $this->_relationsSaveStarted = true;
@@ -406,8 +407,9 @@ class SaveRelationsBehavior extends Behavior
             try {
                 foreach ($this->_relations as $relationName) {
                     if (array_key_exists($relationName, $this->_oldRelationValue)) { // Relation was not set, do nothing...
-                        Yii::trace("Linking {$relationName} relation", __METHOD__);
+                        Yii::debug("Linking {$relationName} relation", __METHOD__);
                         $relation = $model->getRelation($relationName);
+                        if ($relation instanceof ActiveQueryInterface) {
                             if ($relation->multiple === true) { // Has many relation
                                 // Process new relations
                                 $existingRecords = [];
@@ -479,6 +481,7 @@ class SaveRelationsBehavior extends Behavior
                                 }
 
                             }
+                        }
                         unset($this->_oldRelationValue[$relationName]);
                     }
                 }