I created a category table recursively, meaning that in one table, subcategories reference the parent. This resulted in a high degree of nesting. A product belongs to a child category, and using a recursive method in the model, I retrieve all the nested relationships. I need to get a collection of the last relationship in the chain, but I'm getting "null." Could you tell me how to do this?

Here's the code.

/** class Product extends Model **/
public function category() {
      return $this->belongsTo(Category::class, 'category_id');
  }

/** class Category extends Model **/
public function parentCategories()
    {
        return $this->belongsTo(Category::class, 'category_id')->with('parentCategories');
    }

/** Controller **/

$product = Product::with('category.parentCategories')->find(2);
$parent_cat = $product->category->parent_categories;
dd($parent_cat); // null

Hello everyone. I have a category table where each parent category has an unlimited number of children. Products can only appear in the very last child category. How can I group products by parent category?

Thanks for the answers. I solved the problem by creating my own rule and passing the ID of the desired record to it.

Do you mean it like this?

$myId = 1;
$validated = $request->validate([
    'mydata' => 'unique:table,mydata,' . $myId. '|unique:table,mydata_2,' . $myId,
]);

It doesn't work that way for me...

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$myId = 1;
$validated = $request->validate([
    'mydata' => 'unique:table,mydata,' . $myId,
]);

PS: The task requires that file names be changed, which could easily have been solved by assigning a unique name to each newly uploaded file, but alas...

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