Merge pull request #12386 from ryanwinchester/5.1

[5.1] Allow BelongsToMany::saveMany() to accept collections

Author: taylorotwell

src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php

@@ -563,11 +563,11 @@ public function save(Model $model, array $joining = [], $touch = true)
     /**
      * Save an array of new models and attach them to the parent model.
      *
-     * @param  array  $models
+     * @param  \Illuminate\Support\Collection|array  $models
      * @param  array  $joinings
      * @return array
      */
-    public function saveMany(array $models, array $joinings = [])
+    public function saveMany($models, array $joinings = [])
     {
         foreach ($models as $key => $model) {
             $this->save($model, (array) Arr::get($joinings, $key), false);