diff --git a/include/class-FTPAPI.php b/include/class-FTPAPI.php
index 6eaa19a..bc7ccef 100644
--- a/include/class-FTPAPI.php
+++ b/include/class-FTPAPI.php
@@ -1,70 +1,97 @@
 <?php
 # Copyright (C) 2019 Valerio Bozzolan
 # Boz Libre Hosting Panel
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
 # published by the Free Software Foundation, either version 3 of the
 # License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Affero General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 /**
- * FTP users API
+ * Methods related to an FTPAPI class
  */
-class FTPAPI extends DomainAPI {
-
-	/**
-	 * @override
-	 */
-	const DOMAIN_ID = 'ftp.domain_ID';
-
-	public function __construct() {
-		Query::__construct();
-		$this->from( FTP::T );
-		$this->defaultClass( 'FTP' );
-	}
+trait FTPAPITrait {
 
 	/**
 	 * Join FTP and domain tables (once)
 	 *
 	 * @return self
 	 */
 	public function joinFTPDomain() {
 		if( empty( $this->joinedFTPDomain ) ) {
 			$this->joinedFTPDomain = true;
 
 			$this->from( 'domain' );
 			$this->equals( 'domain.domain_ID', 'ftp.domain_ID' );
 		}
 		return $this;
 	}
 
 	/**
 	 * Filter to a certain FTP login
 	 *
 	 * @param string $login
 	 * @return self
 	 */
 	public function whereFTPLogin( $login ) {
 		return $this->whereStr( 'ftp_login', $login );
 	}
 
 	/**
 	 * Limit to a specific FTP account
 	 *
 	 * @param object $ftp FTP account
 	 * @return self
 	 */
 	public function whereFTP( $ftp ) {
 		return $this->whereDomain(   $ftp )
 		            ->whereFTPLogin( $ftp->getFTPLogin() );
 	}
 
+	/**
+	 * Join whatever table with the FTP users table
+	 *
+	 * @param object
+	 * @return self
+	 */
+	public function joinFTP() {
+		return $this->joinOn( 'INNER', 'ftp', static::FTP_ID, 'ftp.ftp_ID' );
+	}
+
+}
+
+// assure load of dependent traits
+class_exists( 'DomainAPI', true );
+
+/**
+ * FTP users API
+ */
+class FTPAPI extends Query {
+
+	use FTPAPITrait;
+	use DomainAPITrait;
+
+	/**
+	 * Univoque domain ID column name
+	 *
+	 * @override
+	 */
+	const DOMAIN_ID = 'ftp.domain_ID';
+
+	public function __construct( $db = null ) {
+		// set database and class
+		parent::__construct( $db, 'FTP' );
+
+		// set table name
+		$this->from( FTP::T );
+	}
+
 }