As per laravel/framework@8331675

morrislaptop · morrislaptop · commit 925fefe7df4e · 2016-02-25T16:14:08.000Z
diff --git a/src/Jenssegers/Mongodb/Schema/Blueprint.php b/src/Jenssegers/Mongodb/Schema/Blueprint.php
@@ -209,7 +209,7 @@ public function drop()
      * @param  array   $parameters
      * @return Blueprint
      */
-    protected function addColumn($type, $name, array $parameters = [])
+    public function addColumn($type, $name, array $parameters = [])
     {
         $this->fluent($name);
 

Original file line number	Diff line number	Diff line change
`@@ -209,7 +209,7 @@ public function drop()`
`209`	`209`	`* @param array $parameters`
`210`	`210`	`* @return Blueprint`
`211`	`211`	`*/`
`212`		`- protected function addColumn($type, $name, array $parameters = [])`
	`212`	`+ public function addColumn($type, $name, array $parameters = [])`
`213`	`213`	`{`
`214`	`214`	`$this->fluent($name);`
`215`	`215`