Fix that relations save the model leading to sql constraint issues

Author: thettler

src/Relations/BelongsToFactoryRelation.php

@@ -29,7 +29,7 @@ public function make(Model $model): Model
     public function create(Model $model): Model
     {
         $relative = $this->convertRelative($this->relatives[0]);
-        $model->{$this->relation}()->associate($relative)->save();
+        $model->{$this->relation}()->associate($relative);
 
         return $model;
     }

src/Relations/MorphToFactoryRelation.php

@@ -26,7 +26,7 @@ public function make(Model $model): Model
      */
     public function create(Model $model): Model
     {
-        $model->{$this->relation}()->associate($this->convertRelative($this->relatives[0]))->save();
+        $model->{$this->relation}()->associate($this->convertRelative($this->relatives[0]));
 
         return $model;
     }