Get nested belongstomany in laravel - php

Question

Hello I have a question:
I have three things :
Top Category
Category
Product
I want to have this : Top Category -> Category -> Product
So I can get all nested information to one Top Category
My Models :
class Overcategory extends Model
{
use HasFactory;
protected $fillable = [
'name',
'img',
];
public function categories()
{
return $this->belongstoMany(Category::class);
}
}
class Category extends Model
{
use HasFactory;
protected $fillable = [
'category_title',
'category_description',
'category_preview_img',
'over_categories_id',
'order',
'price'
];
public function product()
{
return $this->belongstoMany(Product::class);
}
public function overcategories()
{
return $this->belongstoMany(Overcategory::class);
}
}
class Product extends Model
{
use HasFactory;
protected $fillable = [
'product_title',
'product_desc',
'product_preview_img',
'product_price',
];
public function category()
{
return $this->belongstoMany(Category::class);
}
}
And my code to get the Top Category with Category is this :
$relationsship = Overcategory::with('categories')->get();
How would I get the categories with their product too?

Answer 1

In order to get all Overcategory with their Category and their Product, you can use the dot notation when you eager load the relationships.
$relationsship = Overcategory::with('categories.product')->get();
// will get you all the Overcategories with a Categories relationshiop and inside each Category, the Products will be loaded.
This also works the exact same way when you are working on eloquent collections instead of a query builder, with the load method instead of with.
If you want to read more on this topic, here is the documentation https://laravel.com/docs/9.x/eloquent-relationships#querying-relationship-existence.
Quick note aside, if a relationship returns multiple items (which is the case with product) it should be plural (products).