接下來是ProjectInvitationController：

class ProjectInvitationController extends Controller
{
    public function store(InvitationRequest $request, Project $project)
    {

        $validated = $request->validated();
        $invitedMember = User::whereEmail($validated['email'])->first();
        Mail::to($invitedMember->email)->send(new InvitationInformed($invitedMember, $project));
        $project->invite($invitedMember);
        return redirect(route('project.show', compact('project')));
    }
}

class InvitationRequest extends FormRequest
{
    protected $errorBag = 'invitation';
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return Gate::allows('invite',$this->route('project'));
        
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'email'=>'required|exists:users,email'
            ];
    }

    public function messages()
{
    return [
        'email.exists'=>'The invited member should have a valid familyboard account'
    ];
}
}