$options = array('conditions'=>$final,'order'=>$order,'group'=>array('Project.id'),'joins'=>array(
                    array(
                        'table'=>'project_categories',
                        'alias'=>'ProjectCategory',
                        'type' => 'LEFT',
                        'conditions'=>array('ProjectCategory.project_id = Project.id')
                    ),
                    array(
                        'table'=>'categories',
                        'alias'=>'Category',
                        'type' => 'LEFT',
                        'conditions'=>array('ProjectCategory.category_id = Category.id')
                    ),
                ));


                $this->paginate = $options;

$projects = $this->paginate("Project");