İlk temizlik tamamlandı bir önceki projeden

app/Models/SurfaceAreaConstant.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class SurfaceAreaConstant extends Model
+{
+    use HasFactory;
+
+    protected $table = 'surface_area_constants';
+
+    protected $fillable = [
+        'standard',
+        'general_name',
+        'element_name_en',
+        'element_name_ru',
+        'product_standard',
+        'dia_inch',
+        'dia_mm',
+        'surface_area_m2',
+        // 'is_active',
+    ];
+
+    protected $casts = [
+        'dia_mm' => 'decimal:2',
+        'surface_area_m2' => 'decimal:6',
+        // 'is_active' => 'boolean',
+    ];
+
+    /**
+     * Get surface area constants by standard
+     */
+    public static function byStandard($standard)
+    {
+        return self::where('standard', $standard)
+            // ->where('is_active', true)
+            ->get();
+    }
+
+    /**
+     * Get surface area for specific element
+     */
+    public static function getSurfaceArea($standard, $elementNameEn, $diaMm)
+    {
+        return self::where('standard', $standard)
+            ->where('element_name_en', $elementNameEn)
+            ->where('dia_mm', $diaMm)
+            ->first();
+    }
+
+    /**
+     * Get unique diameters
+     */
+    public static function getUniqueDiameters()
+    {
+        return self::select('dia_inch', 'dia_mm')
+            ->distinct()
+            ->orderBy('dia_mm')
+            ->get();
+    }
+
+    /**
+     * Get unique element types
+     */
+    public static function getUniqueElements($standard = null)
+    {
+        $query = self::select('element_name_en')
+            // ->where('is_active', true)
+            ->distinct();
+        
+        if ($standard) {
+            $query->where('standard', $standard);
+        }
+        
+        return $query->pluck('element_name_en');
+    }
+}