Call to undefined method App\Product::whereHas() in laravel - php

Question

Hi try to get my products list in subcategory page but i'm getting this error
Call to undefined method App\Product::whereHas()
here is my function
// Subategory page included posts
public function productsubcategory($slug)
{
$products = Product::whereHas('subcategory.category', function($q) use($slug){
$q->where('slug',$slug);
})->paginate(6);
return view('frontend.subcategories', compact('products'));
}
this is my route:
Route::get('/category/{slug}/subcategory/{subslug}', ['as' => 'showbysub', 'uses' => 'IndexController#productsubcategory']);
my product model:
public function categories(){
return $this->belongsTo(Category::class);
}
public function subcategories(){
return $this->belongsTo(Subcategory::class);
}
category model:
public function products(){
return $this->hasMany(Product::class);
}
public function subcategories(){
return $this->hasMany(Subcategory::class);
}
subcategory model:
public function category(){
return $this->belongsTo(Category::class, 'category_id');
}
public function products(){
return $this->hasMany(Product::class);
}
any idea?
UPDATE:
I changed my function to:
public function productsubcategory($slug)
{
$subcategories = Subcategory::where('slug','=',$slug)->with('products')->paginate(6);
return view('frontend.subcategories', compact('subcategories'));
}
and now my page is loading but will not show any item (product).
UPDATE 2
I changed my function to this:
public function productsubcategory($slug)
{
$products = Product::with('subcategories')
->orderBy('id', 'desc')
->get();
return view('frontend.subcategories', compact('products'));
}
Now I can get products but the problem is all products will show even
if they're included other categories.
How to solve that?

Answer 1

I don't understand what do you mean in this lines
$products = Product::whereHas('subcategory.category', function($q) use($slug){
$q->where('slug',$slug);
})->paginate(6);
Refer to https://laravel.com/docs/5.4/eloquent-relationships. If you are trying to querying relationship, you can do like this:
$products = Product::whereHas('subcategories', function($q) use($slug){
$q->where('slug',$slug);
})->paginate(6);
or
$products = Product::whereHas('categories', function($q) use($slug){
$q->where('slug',$slug);
})->paginate(6);
The relationship name must the same with relationship method in your Product model

Answer 2

SOLVED
public function productsubcategory($slug, $subslug)
{
$products = Product::whereHas('subcategory', function($q) use($subslug){
$q->where('slug',$subslug);
})->get();
return view('frontend.subcategories', compact('products'));
}
and product model from subcategories change to subcategory