first commit

app/Models/SubmissionDocument.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SubmissionDocument extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'submission_id',
+        'original_filename',
+        'stored_path',
+        'file_hash',
+        'mime_type',
+        'size',
+        'version',
+        'is_active',
+        'uploaded_by',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+            'size' => 'integer',
+            'version' => 'integer',
+        ];
+    }
+
+    public function submission(): BelongsTo
+    {
+        return $this->belongsTo(Submission::class);
+    }
+
+    public function uploadedBy(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'uploaded_by');
+    }
+
+    public function humanSize(): string
+    {
+        $bytes = (int) $this->size;
+        if ($bytes >= 1048576) {
+            return round($bytes / 1048576, 2).' MB';
+        }
+        if ($bytes >= 1024) {
+            return round($bytes / 1024, 2).' KB';
+        }
+
+        return $bytes.' B';
+    }
+}