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app/Models/ProductVariation.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ProductVariation extends Model
+{
+    protected $table = 'product_variations';
+
+    protected $fillable = [
+        'product_id',
+        'sku',
+        'name',
+        'price',
+        'old_price',
+        'stock',
+        'is_default',
+        'is_active',
+    ];
+
+    protected $casts = [
+        'is_default' => 'boolean',
+        'is_active' => 'boolean',
+        'price' => 'float',
+        'old_price' => 'float',
+    ];
+
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(Product::class);
+    }
+
+    public function attributes(): HasMany
+    {
+        return $this->hasMany(VariationAttribute::class, 'variation_id');
+    }
+
+    public function images(): HasMany
+    {
+        return $this->hasMany(VariationImage::class, 'variation_id')
+            ->ordered();
+    }
+
+    /**
+     * Получить URL главного изображения вариации
+     */
+    public function getMainImageUrlAttribute(): string
+    {
+        $image = $this->images()->first();
+
+        if ($image) {
+            return $image->url;
+        }
+
+        return asset('assets/images/products/default.svg');
+    }
+
+    /**
+     * Получить все изображения вариации
+     */
+    public function getAllImages()
+    {
+        return $this->images;
+    }
+
+    public function getHasDiscountAttribute(): bool
+    {
+        return $this->old_price && $this->old_price > $this->price;
+    }
+
+    public function getDiscountPercentAttribute(): int
+    {
+        if (!$this->has_discount) return 0;
+        return round(($this->old_price - $this->price) / $this->old_price * 100);
+    }
+
+    public function getInStockAttribute(): bool
+    {
+        return $this->stock > 0;
+    }
+
+    public function getFormattedPriceAttribute(): string
+    {
+        return number_format($this->price, 0, '.', ' ') . ' ₽';
+    }
+
+    public function getFormattedOldPriceAttribute(): string
+    {
+        if (!$this->old_price) return '';
+        return number_format($this->old_price, 0, '.', ' ') . ' ₽';
+    }
+
+    public static function isSkuUnique($sku, $excludeId = null, $productId = null)
+    {
+        $query = self::where('sku', $sku);
+
+        if ($excludeId) {
+            $query->where('id', '!=', $excludeId);
+        }
+
+        if ($productId) {
+            $query->where('product_id', $productId);
+        }
+
+        return !$query->exists();
+    }
+
+    public function scopeActive($query)
+    {
+        return $query->where('is_active', true);
+    }
+
+    public function scopeInStock($query)
+    {
+        return $query->where('stock', '>', 0);
+    }
+
+    public function scopeDiscounted($query)
+    {
+        return $query->whereNotNull('old_price')
+            ->whereColumn('old_price', '>', 'price');
+    }
+
+    public function scopeDefault($query)
+    {
+        return $query->where('is_default', true);
+    }
+
+    // ========== МЕТОДЫ ДЛЯ AJAX ==========
+
+    public static function getImagesByVariationId($variationId)
+    {
+        $variation = self::with(['images' => function ($query) {
+            $query->active()->ordered();
+        }])->find($variationId);
+
+        if (!$variation) {
+            return collect();
+        }
+
+        return $variation->images;
+    }
+
+    public static function getImagesDataById($variationId)
+    {
+        $images = self::getImagesByVariationId($variationId);
+
+        return $images->map(function ($image) {
+            return [
+                'id' => $image->id,
+                'url' => $image->url,
+                'sort_order' => $image->sort_order,
+                'variation_id' => $image->variation_id
+            ];
+        });
+    }
+}