better collection handlich in backend

app/Models/Collection.php

@@ -7,9 +7,34 @@ use App\Models\Dataset;
 
 class Collection extends Model
 {
+    public $timestamps = false;
+    protected $fillable = [
+        'name',
+        'role_id',
+    ];
 
     public function documents()
     {
         return $this->belongsToMany(Dataset::class, 'link_documents_collections', 'collection_id', 'document_id');
     }
+
+    #region self join
+    public function parent()
+    {
+        return $this->belongsTo(self::class, 'parent_id');
+    }
+
+    public function children()
+    {
+        return $this->hasMany(self::class, 'parent_id');
+    }
+    #endregion
+
+    /**
+     * Get the collection role that the dataset belongs to.
+     */
+    public function collectionrole()
+    {
+        return $this->belongsTo(CollectionRole::class, 'role_id', 'id');
+    }
 }

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');
+    }
+}

app/Models/Dataset.php

@@ -62,6 +62,12 @@ class Dataset extends Model
             ->belongsToMany(Collection::class, 'link_documents_collections', 'document_id', 'collection_id');
     }
 
+    // public function collectionRoles()
+    // {
+    //     return $this
+    //         ->belongsToMany(CollectionRole::class, 'link_documents_collections', 'document_id', 'role_id');
+    // }
+
     #region [person table]
 
     //return all persons attached to this film

app/Models/Project.php

@@ -12,7 +12,7 @@ class Project extends Model
     // for using $input = $request->all();
     //$project = Project::create($input);
     protected $fillable = [
-        'name', 'label'
+        'name', 'label', 'description'
     ];