> */ public function rules(): array { return [ 'username' => [ 'required', 'string', 'max:255', 'alpha_dash', function ($attribute, $value, $fail): void { if (User::whereRaw('LOWER(username) = ?', [strtolower($value)])->exists()) { $fail('The username has already been taken.'); } }, ], 'first_name' => ['required', 'string', 'max:255'], 'last_name' => ['required', 'string', 'max:255'], 'email' => ['required', 'string', 'lowercase', 'email', 'max:255', 'unique:'.User::class], 'password' => ['required', 'confirmed', Rules\Password::defaults()], ]; } }