first commit

app/Models/DocumentProduct.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;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class DocumentProduct extends Model
+{
+    protected $table = 'document_product';
+
+    use HasFactory;
+
+    protected $fillable = ['product_id', 'document_id', 'quantity', 'past_quantity'];
+
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(Product::class);
+    }
+}