How to properly create a custom MailTemplate?

[Marchiuzzz]

I'm trying to implement a custom MailTemplate class called CustomMailTemplate. However I don't understand if it's suppose to replace the MailTemplate model completely (should I even create mail_templates table if I want to use a custom one?). I renamed the published migration and adapted it to my needs

class CreateCustomMailTemplatesTable extends Migration
{
    public function up()
    {
        Schema::create('custom_mail_templates', function (Blueprint $table) {
            $table->increments('id');
            $table->string('mailable');
            $table->unsignedBigInteger('sub_event_mail_template_id');
            $table->foreign('sub_event_mail_template_id')->references('id')->on('subscription_event_mail_templates');
            $table->boolean('active')->default(true);
            $table->timestamps();
        });
    }
}

I'm trying to use it in my SubscriptionMail mailable, I have added this line protected static $templateModelClass = App\CustomMailTemplate::class;. However, if I try to send an email, I get an error No mail template exists for mailable SubscriptionMail

[Marchiuzzz]

Aghh my bad, it was a typo, used the wrong Mailable path in database. However, I found another issue with the documentation - shouldn't getHtmlLayout method be called getHtmlTemplate as it is in the interface? For example here

use Spatie\MailTemplates\Models\MailTemplate;

class MeetupMailTemplate extends MailTemplate implements MailTemplateInterface
{
    public function meetupGroup(): BelongsTo
    {
        return $this->belongsTo(MeetupGroup::class);
    }
    
    public function scopeForMailable(Builder $query, Mailable $mailable): Builder
    {
        return $query
            ->where('mailable', get_class($mailable))
            ->where('meetup_group_id', $mailable->getMeetupGroupId());
    }
    
    public function getHtmlLayout(): string
    {
        return $this->meetupGroup->mail_layout;
    }
}

Sorry, I don't know how to create a PR