Laravel 5 Product Quantity reduce for every sale

Question

I have an Laravel store with Product Quantity in my DB.

The Quantity left what Members see :

Quantity : {{$product->instock}}

Product Create :

<input type="number" name="instock" id="instock" class="productcreate" value="{{old('instock')}}" placeholder="Enter Your Quantity"> in Stock

Controller:

  if ($request->instock == null) {
    session()->flash('errormessage','Quantity is required');
    return redirect()->back()->withInput();
  }

How can I reduce my Quantity for every Sold item? Example I have 90 Items right now in stock. An Member buy one Item and the Quantity Reduce to 89 Items right now in Quantity: {{$product->instock}}

What code must I add in my Controller for it?

Thanks

Answer 1

When someone makes a purchase use the decrement() method. Something like:

Product::decrement('instock', $itemsPurchased);