first upload all files

Modules/Attribute/Entities/ProductAttributeValue.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\Model;
+
+class ProductAttributeValue extends Model
+{
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['attributeValue'];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['product_attribute_id', 'attribute_id'];
+
+    /**
+     * The accessors to append to the model's array form.
+     *
+     * @var array
+     */
+    protected $appends = ['value'];
+
+    public function exists()
+    {
+        return ! is_null($this->attributeValue);
+    }
+
+    public function attributeValue()
+    {
+        return $this->belongsTo(AttributeValue::class, 'attribute_value_id');
+    }
+
+    public function getIdAttribute()
+    {
+        return $this->attributeValue->id;
+    }
+
+    public function getValueAttribute()
+    {
+        return $this->attributeValue->value;
+    }
+}