Transfer few methods from model database to propers tables models

models/Contact.php

@@ -58,6 +58,19 @@ namespace models;
 
             return isset($contacts[0]) ? $contacts[0] : false;
         }
+        
+        
+        /**
+         * Get contacts of a particular group
+         *
+         * @param int $id_group : Id of the group we want contacts for
+         * @return array
+         */
+        public function get_by_group($id_group)
+        {
+            $contacts = $this->_select('contact', ['id_group' => $id_group]);
+            return $contacts;
+        }
 
         /**
          * Retourne une liste de contactes sous forme d'un tableau.