hasOneThrough Laravel Eloquent Relationship - laravel

Question

I have 3 tabes categories, sub_categories & products
category table
---------------------
| id | category_name |
---------------------
sub_category table
--------------------------------------------
| id | category_id(FK) | sub_category_name |
--------------------------------------------
product table
-----------------------------------------------------------------
| id | sub_category_id(FK) | product_name | product_description |
-----------------------------------------------------------------
**How do I get product category name using hasOneThrough eloquent relationship ( or using any other relationship).
I tried this in product model **
public function category(){
return $this->hasOneThrough(
Category::class,
SubCategory::class
);
}
But it gives error: Unknown column 'sub_categories.product_id'

Answer 1

You can install this external package staudenmeir/belongs-to-through to add the relationship you need.
class Product extends Model
{
public function subCategory()
{
return $this->belongsTo(SubCategory::class);
}
public functoin category()
{
return $this->belongsToThrough(Category::class, SubCategory::class);
}
}
class SubCategory extends Model
{
public functoin category()
{
return $this->belongsTo(Category::class);
}
}
class Category extends Model
{
public function subCategories()
{
return $this->hasMany(SubCategory::class);
}
public functoin products()
{
return $this->hasManyThrough(Product::class, SubCategory::class);
}
}
If you need to access Category directly from Product, and want to use laravels functions like $product->category()->attach($category->id) etc, then you need this dependency to achieve that.
If you are ok with doing:
$product->subCategory->category;
// or
$product->subCategory->category()->attach($category->id);
Then you don't need the dependency and you can exclude the category relationship on the Product model.