first upload all files

Modules/Attribute/Entities/ProductAttribute.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\Model;
+
+class ProductAttribute extends Model
+{
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['attribute', 'values'];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['attribute_id'];
+
+    /**
+     * The accessors to append to the model's array form.
+     *
+     * @var array
+     */
+    protected $appends = ['name'];
+
+    /**
+     * Indicates if the model should be timestamped.
+     *
+     * @var bool
+     */
+    public $timestamps = false;
+
+    public function attribute()
+    {
+        return $this->belongsTo(Attribute::class);
+    }
+
+    public function values()
+    {
+        return $this->hasMany(ProductAttributeValue::class, 'product_attribute_id');
+    }
+
+    public function getNameAttribute()
+    {
+        return $this->attribute->name;
+    }
+
+    public function getAttributeSetAttribute()
+    {
+        return $this->attribute->attributeSet->name;
+    }
+}