AddMembers issue

[mehdielaissi]

Hello @musonza I hope you are doing well.
Is it normal that when I use the groups->addMembers method
I get all the old members deleted from the group ?
I want to add new members to the actual members
This is the code I used

public function ajouterEleve(Request $request){
       
        $eleves =$request->input('eleves');
        $id=$request->input('groupId');
        $group=  Groups::group($id);
        $group->addMembers($eleves);

        return redirect()->back();
    }

can you explain this please

 public function addMembers($members)
    {
        if (is_array($members)) {
            $this->users()->sync($members);
        } else {
            $this->users()->attach($members);
        }

        return $this;
    }