Laravel 5 - How do I return a oneToMany relationship?

I'm new to Laravel, and using Laravel 5 i'm having trouble returning an array from my database.

I have several "acts", and each act has many "banners". Whenever I try to get output from my array of banners ( $act->banners->count() ), i find it throws an error because it is null.

Here is the code:

routes.php:

Route::model('banners', 'Banner');
Route::model('acts', 'Act');

// Controller routes
Route::resource('acts', 'sf_ActController');
Route::resource('acts.banners', 'sf_BannerController');


Route::bind('banners', function($value, $route) {
    return App\Banner::whereact_id($value)->first();
});
Route::bind('acts', function($value, $route) {
    return App\Act::whereact_id($value)->first();
});

Act.php (model)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Act extends Model
{
protected $table = 'sf_act';
protected $primaryKey = 'act_id';

public function act() {
      return $this->hasMany('Banner');

    }
}

Banner.php (model)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Banner extends Model
{

  protected $table = 'sf_banner';
  protected $primaryKey = 'banner_id';

  public function banner() {
        return $this->belongsTo('Act' , 'act_id' , 'act_id');
  }
}

sf_ActController.php (controller)

namespace App\Http\Controllers;
use Illuminate\Http\Request;

use App\Act;
use App\Banner;
use App\Http\Requests;
use App\Http\Controllers\Controller;

use Input;
use Redirect;

class sf_ActController extends Controller
{
  public function show(Act $act)
  {

  //pass object to correct view
  return view('pages.acts.show' , compact('act'))->with('banner', Banner::find($act));
  }

acts/show.blade.php (view)

<!-- /resources/views/acts/show.blade.php -->
@extends('app')

@section('content')
<h2>{{ $act->act_title }}</h2>

  {{ $act->banners->count() }}

at this point I get the following error:

FatalErrorException in a03036ad81fb4e6d90e9fe5e3da62c65 line 7: Call to a member function count() on null

Why am I not fetching my banner data!? (The title variable in the h2 tags outputs fine, so the db and everything up until that point is working.)Thanks.

You need to specify the complete "route" to the model in the relationships including the namespace:

public function act() {
  return $this->hasMany('App\Banner');

}

And the same on belongsTo:

public function banner() {
    return $this->belongsTo('App\Act' , 'act_id' , 'act_id');
}

Could be a good idea to include the name of the foreign kay in the hasMany method.

public function act() {
  return $this->hasMany('App\Banner', 'act_id');

}

Also possibly you don't need to include the third parameter in the belongs to.