filament: Unable to Create Entity When Using HasOne Relationship

Package

filament/filament

Package Version

v2.13.24

Laravel Version

v9.19.0

Livewire Version

v2.10.6

PHP Version

PHP 8.0.19

Bug description

I followed the instructions at https://filamentphp.com/docs/2.x/forms/layout#saving-data-to-relationships to create the following form schema which should save user data while creating the employee and creating the relationship:

class EmployeeResource extends Resource
{
    protected static ?string $model = Employee::class;

    protected static ?string $navigationIcon = 'heroicon-o-collection';

    public static function form(Form $form): Form
    {
        return $form
            ->schema([
                Fieldset::make('Employee Data')
                    ->schema([
                        TextInput::make('employee_code')->required(),
                    ]),
                Fieldset::make('User')
                    ->relationship('user')
                    ->schema([
                        TextInput::make('name')->required(),
                        TextInput::make('email')->email()->required(),
                        TextInput::make('password')->password()->required(),
                    ])
            ]);
    }

But I keep getting this error:

SQLSTATE[HY000]: General error: 1364 Field 'user_id' doesn't have a default value
insert into `employees` (`employee_code`, `updated_at`, `created_at`) values (TEST, 2022-07-08 20:49:42, 2022-07-08 20:49:42)

Any ideas on what I am doing wrong here?

Steps to reproduce

1. Create a model named Employee with hasOne relationship with User model
2. Create EmployeeResource using make:filament-resource
3. Add the following form schema to EmployeeResource as per https://filamentphp.com/docs/2.x/forms/layout#saving-data-to-relationships

    public static function form(Form $form): Form
    {
        return $form
            ->schema([
                Fieldset::make('Employee Data')
                    ->schema([
                        TextInput::make('employee_code')->required(),
                    ]),
                Fieldset::make('User')
                    ->relationship('user')
                    ->schema([
                        TextInput::make('name')->required(),
                        TextInput::make('email')->email()->required(),
                        TextInput::make('password')->password()->required(),
                    ])
            ]);
    }

1. Run php artisan serve
2. Go to http://127.0.0.1:8000/admin/employees/create and submit
3. Error showing on screen

SQLSTATE[HY000]: General error: 1364 Field 'user_id' doesn't have a default value
insert into `employees` (`employee_code`, `updated_at`, `created_at`) values (TEST, 2022-07-08 20:49:42, 2022-07-08 20:49:42)

Reproduction repository

https://github.com/Uolsen/filament-hasone-bug

Relevant log output

SQLSTATE[HY000]: General error: 1364 Field 'user_id' doesn't have a default value
insert into `employees` (`employee_code`, `updated_at`, `created_at`) values (TEST, 2022-07-08 20:49:42, 2022-07-08 20:49:42)