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Modules/Attribute/Entities/Attribute.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\Model;
+use Modules\Category\Entities\Category;
+use Modules\Support\Eloquent\Sluggable;
+use Modules\Support\Eloquent\Translatable;
+use Modules\Attribute\Admin\AttributeTable;
+
+class Attribute extends Model
+{
+    use Translatable, Sluggable;
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['translations'];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['attribute_set_id', 'slug', 'is_filterable'];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'is_filterable' => 'boolean',
+    ];
+
+    /**
+     * The attributes that are translatable.
+     *
+     * @var array
+     */
+    public $translatedAttributes = ['name'];
+
+    /**
+     * The attribute that will be slugged.
+     *
+     * @var string
+     */
+    protected $slugAttribute = 'name';
+
+    /**
+     * Perform any actions required after the model boots.
+     *
+     * @return void
+     */
+    protected static function booted()
+    {
+        static::saved(function (self $attribute) {
+            $attribute->saveRelations(request()->all());
+        });
+    }
+
+    public function attributeSet()
+    {
+        return $this->belongsTo(AttributeSet::class);
+    }
+
+    public function categories()
+    {
+        return $this->belongsToMany(Category::class, 'attribute_categories');
+    }
+
+    public function values()
+    {
+        return $this->hasMany(AttributeValue::class)->orderBy('position');
+    }
+
+    public function table()
+    {
+        return new AttributeTable($this->with('attributeSet'));
+    }
+
+    public function saveRelations(array $attributes)
+    {
+        $this->categories()->sync(array_get($attributes, 'categories', []));
+        $this->saveValues(array_get($attributes, 'values', []));
+    }
+
+    public function saveValues($values = [])
+    {
+        $ids = $this->getDeleteCandidates($values);
+
+        if ($ids->isNotEmpty()) {
+            $this->values()->whereIn('id', $ids)->delete();
+        }
+
+        foreach (array_reset_index($values) as $index => $value) {
+            $this->values()->updateOrCreate(
+                ['id' => $value['id']],
+                $value + ['position' => $index]
+            );
+        }
+    }
+
+    private function getDeleteCandidates($values = [])
+    {
+        return $this->values()
+            ->pluck('id')
+            ->diff(array_pluck($values, 'id'));
+    }
+}

Modules/Attribute/Entities/AttributeSet.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Admin\Ui\AdminTable;
+use Modules\Support\Eloquent\Model;
+use Modules\Support\Eloquent\Translatable;
+
+class AttributeSet extends Model
+{
+    use Translatable;
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['translations'];
+
+    /**
+     * The attributes that aren't mass assignable.
+     *
+     * @var array
+     */
+    protected $guarded = [];
+
+    /**
+     * The attributes that are translatable.
+     *
+     * @var array
+     */
+    public $translatedAttributes = ['name'];
+
+    public function attributes()
+    {
+        return $this->hasMany(Attribute::class);
+    }
+
+    public function table()
+    {
+        return new AdminTable($this->newQuery());
+    }
+}

Modules/Attribute/Entities/AttributeSetTranslation.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\TranslationModel;
+
+class AttributeSetTranslation extends TranslationModel
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['name'];
+}

Modules/Attribute/Entities/AttributeTranslation.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\TranslationModel;
+
+class AttributeTranslation extends TranslationModel
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['name'];
+}

Modules/Attribute/Entities/AttributeValue.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\Model;
+use Modules\Support\Eloquent\Translatable;
+
+class AttributeValue extends Model
+{
+    use Translatable;
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['translations'];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['position'];
+
+    /**
+     * The attributes that are translatable.
+     *
+     * @var array
+     */
+    public $translatedAttributes = ['value'];
+}

Modules/Attribute/Entities/AttributeValueTranslation.php

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+<?php
+
+namespace Modules\Attribute\Entities;
+
+use Modules\Support\Eloquent\TranslationModel;
+
+class AttributeValueTranslation extends TranslationModel
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['value'];
+}

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;
+    }
+}

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;
+    }
+}