undefined method App\ProductPhoto laravel

I'm creating a functionality where user can add the product with multiple images to favorites, the problem happens when user clicks to see the product details before adding to favorites it throws an error Call to undefined method App\ProductsPhoto::favouritedBy(). In blade the line that cause problem is this

@foreach($product->ProductsPhoto as $product)
<img src="">
@endforeach

if I remove that line it displays no error but also not displaying the images(carousel) and if I change the the line to

@if(count($product->ProductsPhoto))
<img src="">
@else
@endif 

it displays only the first image . And if I add these functions

public function favourites(){
return $this->morphToMany(User::class, 'favouriteable');
}

public function favouritedBy(User $user){
return $this->favourites->contains($user);
}

to the ProductsPhoto model and click the product details it shows all the images but if I click the add to favorite button it says 404 means that route doesn't exist while it does. How can I display all the images and make it work?

Controller

public function store(Request $request, Product $product)
{
$request->user()->favouriteProducts()->syncWithoutDetaching([$product->id]);
return back();
}

ProductDetail Blade

@foreach($products as $product)
<h2>USD </h2>

@foreach($product->ProductsPhoto as $product)
<img src=">
@endforeach

@endforeach


@if(!$product->favouritedBy(Auth::user()))
<a href="" onclick="event.preventDefault(); document.getElementById('product-fav-form').submit();">Add to Favorite </a>

<form id="product-fav-form" class="hidden" action="" method="POST">

</form>
@endif

Route

Route::post('/products/{product}/favourites', 'HomeController@store')
->name('product.fav.store');

Product Model

public function ProductsPhoto()
{
return $this->hasMany('App\ProductsPhoto','product_id');
}


public function favourites(){
return $this->morphToMany(User::class, 'favouriteable');
}

public function favouritedBy(User $user){
return $this->favourites->contains($user);
}

ProductsPhoto Model

class ProductsPhoto extends Model
{
protected $fillable = ['product_id', 'filename'];

public function product()
{
return $this->belongsTo('App\Product','product_id');
}    
}

User model

public function favouriteProducts(){
return $this->morphedByMany(Product::class,'favouriteable')
->withPivot(['created_at'])->orderBy('pivot_created_at', 'desc');
}

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