fix on shelve with available offers

app/Models/Shop/Categorizable.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Models\Shop;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Categorizable extends Model
+{
+    protected $table = 'categorizables';
+
+    public function categorizable()
+    {
+        return $this->morphTo();
+    }
+
+    public function category()
+    {
+        return $this->belongsTo(Category::class);
+    }
+
+    public function articles()
+    {
+        return $this->belongsTo(Article::class)->where('categorizable_type', Article::class);
+    }
+
+    public function scopeByCategory($query, $category_id)
+    {
+        return $query->where($this->table . '.category_id', $category_id);
+    }
+
+    public function scopeByCategories($query, $categories_id)
+    {
+        return $query->whereIn($this->table . '.category_id', $categories_id);
+    }
+
+    public function scopeByCategoryParent($query, $category_id)
+    {
+        $category = Category::find($category_id);
+        return $query->whereHas('category', function ($query) use ($category) {
+            return $query->inRange($category->_lft, $category->_rgt);
+        });
+    }
+}