my changes

app/Dataset.php

@@ -0,0 +1,184 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+use App\Library\Xml\DatasetExtension;
+use phpDocumentor\Reflection\Types\Null_;
+
+class Dataset extends Model
+{
+    use DatasetExtension;
+    protected $table = 'documents';
+    
+    //public $timestamps = false; //default true
+    // customize the names of the columns used to store the timestamps:
+    const CREATED_AT = 'server_date_created';
+    const UPDATED_AT = 'server_date_modified';
+    const PUBLISHED_AT = 'server_date_published';
+
+    protected $fillable = [
+        'type',
+        'publication_state',
+        'thesis_year_accepted',
+        'project_id',
+        'embargo_date'
+    ];
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = [
+        'server_date_created',
+        'server_date_modified',
+        'server_date_published'
+    ];
+    //protected $dateFormat = 'Y-m-d';
+
+
+    public function __construct(array $attributes = array())
+    {
+        parent::__construct($attributes);
+        // $this->_init();
+    }
+
+    public function project()
+    {
+        return $this->belongsTo(\App\Project::class, 'project_id', 'id');
+    }
+
+    public function collections()
+    {
+        return $this
+            ->belongsToMany(\App\Collection::class, 'link_documents_collections', 'document_id', 'collection_id');
+    }
+
+    #region [person table]
+
+    //return all persons attached to this film
+    public function persons()
+    {
+        return $this->belongsToMany(\App\Person::class, 'link_documents_persons', 'document_id', 'person_id')
+            ->withPivot('role');
+    }
+
+    /**
+     * Return all authors for this dataset
+     *
+     * @return \App\Person
+     */
+    public function authors()
+    {
+        return $this
+            ->belongsToMany(\App\Person::class, 'link_documents_persons', 'document_id', 'person_id')
+            ->wherePivot('role', 'author');
+    }
+
+    /**
+     * Add author to dataset
+     *
+     * @param \App\User $user user to add
+     *
+     * @return void
+     */
+    public function addAuthor(\App\User $user) : void
+    {
+        $this->persons()->save($user, ['role' => 'author']);
+    }
+
+    /**
+     * Return all contributors for this dataset
+     *
+     * @return \App\Person
+     */
+    public function contributors()
+    {
+        return $this
+            ->belongsToMany(\App\Person::class, 'link_documents_persons', 'document_id', 'person_id')
+            ->wherePivot('role', 'contributor');
+    }
+
+    #endregion
+
+    #region title table:
+
+    public function titles()
+    {
+        return $this->hasMany(\App\Title::class, 'document_id', 'id')
+            ->where('type', 'main');
+    }
+    // public function addTitle(\App\Title $title)
+    // {
+    //     $this->persons()->save($title, ['type' => 'main']);
+    // }
+
+    /**
+     * Relation abstracts
+     *
+     * @return \App\Title
+     */
+    public function abstracts()
+    {
+        return $this->hasMany(\App\Title::class, 'document_id', 'id')
+            ->where('type', 'abstract');
+    }
+    // public function addAbstract (\App\Title $title)
+    // {
+    //     $this->persons()->save($title, ['type' => 'abstract']);
+    // }
+
+    #endregion
+
+    public function licenses()
+    {
+        return $this->belongsToMany(\App\License::class, 'link_documents_licences', 'document_id', 'licence_id');
+    }
+
+    public function files()
+    {
+        return $this->hasMany(\App\File::class, 'document_id', 'id');
+    }
+
+    /**
+     * Get the xml-cache record associated with the dataset.
+     *
+     * @return \App\XmlCache
+     */
+    public function xmlCache()
+    {
+        return $this->hasOne(\App\XmlCache::class, 'document_id', 'id');
+    }
+
+
+
+    public function scopeOrderByType($query)
+    {
+        return $query->orderBy('type');
+    }
+
+    /**
+     * Get earliest publication date.
+     *
+     * @param \Illuminate\Database\Eloquent\Builder $query  sql-query
+     * @param string                                $column column
+     *
+     * @return \Carbon\Carbon\Date
+     */
+    public function scopeEarliestPublicationDate($query, string $column = null)
+    {
+        if (!$column) {
+            $column = self::PUBLISHED_AT;
+        }
+        return $query->whereNotNull('server_date_published')
+            ->where('server_state', 'published')
+            ->orderBy('server_date_published', 'asc')
+            ->first()
+            ->server_date_published;
+    }
+
+    public function hasProject()
+    {
+        return $this->project()->exists();
+    }
+}