Boolean falsy value ignored on resource edition for HasOne relationship

[meyer59]

• Laravel Version: 9.19
• Nova Version: 4.11
• PHP Version: 8.1.7
• Database Driver & Version: mysql 8
• Operating System and Version: win10
• Browser type and version: chrome102

Description:

Hello
The falsy value for a boolean is not taking into account (on the HasOne )when editing a resource with an HasOne relationship.
Here is my field definition:

//HasOne field
 Boolean::make('deactivated_at', 'deactivated_at') 
                   ->rules('required', 'boolean')
                   ->trueValue(optional($this->resource)->deactivated_at ?? now())
                   ->falseValue(null)
                   ->default(null)
                   ->onlyOnForms(),

When the checkbox is unchecked, the value transmited is 0 but it should be null

Detailed steps to reproduce the issue on a fresh Nova installation:

Create a resource with an HasOne relationship
Edit the resource, you should see the HasOne relationship bellow the resource. (Same as explained here #4470)

The relationship should have a Boolean field.
Define a falsy value different than 0 for the Boolean field.
Save the resource.
An error should appear

[crynobone]

Boolean field was designed to work with boolean schema and not datetime, you should use fillInto() method as explained in https://nova.laravel.com/docs/4.0/resources/fields.html#field-hydration if you want to handle datetime field using Boolean

[meyer59]

fillUsing() raise the same error. This error is raised only on the resource with the HasOne bellow.
If i edit the main resource everything works fine.
The problem here is the falsy value. Nova still insert 0 instead of null event with fillUsing().
Seems like a bug..