title: Soft Deleting through relationships
body: <p>I am trying to understand something.  </p>
  
  <p>I have a Project Model.<br>
  A Project can have many Document.<br>
  A Document has many DocumentData.</p>
  
  <p>So this is straight forward, I have my models set up like so</p>
  
  <pre><code>class Project extends Model
  {
      protected $table = 'projects';
      protected $guarded = [];
      use SoftDeletes;
  
      public function document()
      {
          return $this-&gt;hasMany('App\document', 'projectId');
      }
  
      public static function boot()
      {
          parent::boot();
  
          static::deleted(function($document)
          {
              $document-&gt;delete();
          });
      }
  }
  
  class Document extends Model
  {
      use SoftDeletes;
  
      protected $table = 'document';
      protected $guarded = [];
  
      public function project()
      {
          return $this-&gt;belongsTo('App\Project', 'projectId');
      }
  
      public function documentData()
      {
          return $this-&gt;hasMany('App\DocumentData', 'documentId');
      }
  
      public static function boot()
      {
          parent::boot();
  
          static::deleted(function($document)
          {
              $document-&gt;documentData()-&gt;delete();
          });
      }
  }
  
  class DocumentData extends Model
  {
      use SoftDeletes;
  
      protected $table = 'document_data';
      protected $guarded = [];
  
      public function document()
      {
          return $this-&gt;belongsTo('App\Document', 'documentId');
      }
  }
  </code></pre>
  
  <p>I am trying to understand the boot function and whether I have set it up properly?  When I delete a project, its deleted_at timestamp is set.  I am also looking for it to set the deleted at timestamp for all of that Projects Documents and DocumentData.  </p>
  
  <p>At the moment, when I delete a Project, on its deleted_at timestamp is set.  The Document and DocumentData remains null.</p>
  
  <p>How can I get it soft deleting through all related models?</p>
  
  <p>Thanks</p>