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app/Models/Compra.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Compra extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'fecha',
+        'proveedor_id',
+        'total',
+        'estado',
+    ];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'id' => 'integer',
+        'fecha' => 'datetime',
+        'proveedor_id' => 'integer',
+        'total' => 'decimal:2',
+    ];
+
+    public function proveedor(): BelongsTo
+    {
+        return $this->belongsTo(Proveedor::class);
+    }
+    
+    public function detalles()
+    {
+        return $this->hasMany(DetalleCompra::class);
+    }
+
+    /**
+     * Boot del modelo para eventos
+     */
+    protected static function boot()
+    {
+        parent::boot();
+
+        // Al eliminar una compra, eliminar sus detalles
+        static::deleting(function ($compra) {
+            $compra->detalles()->delete();
+        });
+    }
+
+}