better collection handlich in backend

app/Models/CollectionRole.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Collection;
+use App\Models\Dataset;
+use Illuminate\Database\Eloquent\Model;
+
+class CollectionRole extends Model
+{
+    protected $table = 'collections_roles';
+    public $timestamps = false;
+    protected $fillable = [
+        'name',
+        'oai_name',
+        'visible',
+    ];
+
+    // public function documents()
+    // {
+    //     return $this->belongsToMany(Dataset::class, 'link_documents_collections', 'role_id', 'document_id');
+    // }
+
+    public function collections()
+    {
+        //model, foreign key on the Collection model is role_id, local id of this is id
+        return $this->hasMany(Collection::class, 'role_id', 'id');
+    }
+}