Invoicable_id should not be null

[RyonMB]

Detailed description

I got a bug when I wanted to create a new Order: Integrity constraint violation: 1048 Column 'invoicable_id' cannot be null (SQL: insert into invoices (invoicable_id, invoicable_type, currency, status, reference, updated_at, created_at)

It happens when I am using this: $invoice = $order->invoices()->create([]);

Your environment

Using laravel 5.8 with php 7.3

• Version used (e.g. PHP 5.6, HHVM 3):
• Operating system and version (e.g. Ubuntu 16.04, Windows 7):
• Link to your project:
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[sandervanhooft]

Can you share the output of dd($order->all())?

[janmaarten]

This happens when you outright just follow the example. When you get an eloquent model, like $order = Order::findOrFail(1) or something, you'll get a proper invoice.