How to put session value store into database?

I wanted to retrieve session array and put into other model But throws `

Call to a member function pluck() on array

Controller I used :

$orders =  $request->session()->get('order');
$order = new Order();
$order->school_id = $orders->pluck('school_id');
$order->order_date = $orders->pluck('order_date');
$order->time_slot = $orders->pluck('time_slot');

How do i access the session data and put into other model?

Here is the response I get when i dd() the session :

array:1 [▼
  0 => array:3 [▼
    "school_id" => "4"
    "order_date" => "11/25/2017"
    "time_slot" => "10am - 8pm"
  ]
]

via Chebli Mohamed