how to create triadic relations in laravel framework

I need to create triadic relation in laravel framework.

Consider three models: Card, Notes, User.

Card is related to notes and user, while they are related to each other. Now in models, when the relation ship would be drafted, Card->belongTo -> Notes Notes-> hasMany -> Card

The problem is when relationship between card and user is created, keeping to above rules,the connection is not made.

user -> hasMany ->card; Card ->belongTo -> user.

stacktrace:

1/1 MethodNotAllowedHttpException in RouteCollection.php line 218:

    in RouteCollection.php line 218
    at RouteCollection->methodNotAllowed(array('POST')) in RouteCollection.php line 205
    at RouteCollection->getRouteForMethods(object(Request), array('POST')) in RouteCollection.php line 158
    at RouteCollection->match(object(Request)) in Router.php line 821
    at Router->findRoute(object(Request)) in Router.php line 691
    at Router->dispatchToRoute(object(Request)) in Router.php line 675
    at Router->dispatch(object(Request)) in Kernel.php line 246
    at Kernel->IlluminateFoundationHttp{closure}(object(Request))
    at call_user_func(object(Closure), object(Request)) in Pipeline.php line 52
    at Pipeline->IlluminateRouting{closure}(object(Request)) in CheckForMaintenanceMode.php line 44
    at CheckForMaintenanceMode->handle(object(Request), object(Closure))
    at call_user_func_array(array(object(CheckForMaintenanceMode), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136
    at Pipeline->IlluminatePipeline{closure}(object(Request))
    at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32
    at Pipeline->IlluminateRouting{closure}(object(Request))
    at call_user_func(object(Closure), object(Request)) in Pipeline.php line 102
    at Pipeline->then(object(Closure)) in Kernel.php line 132
    at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 99
    at Kernel->handle(object(Request)) in index.php line 53
    at require_once('/home/sayali/people_finder/public/index.php') in server.php line 21

my user.php - has a func Cards

public function cards()
{
    return $this->hasMany(Note::class);
}

in cards.php

public function user()
{
    return $this->belongsTo(User::class);
}