diff --git a/idiorm.php b/idiorm.php
index 5b327a61..6b97ce8a 100644
--- a/idiorm.php
+++ b/idiorm.php
@@ -540,9 +540,27 @@ public function find_many() {
          */
         protected function _find_many() {
             $rows = $this->_run();
-            return array_map(array($this, '_create_instance_from_row'), $rows);
+            return $this->_instances_with_key($rows);
         }
 
+        /**
+         * Create instances and assigns it to an associative array
+         * @return array
+         */
+
+        protected function _instances_with_key($rows){
+            $size = count($rows);
+            $instances = array();
+            for ($i = 0; $i < $size; $i++) {
+                $row = $this->_create_instance_from_row($rows[$i]);
+                $key = (isset($row->{$this->_instance_id_column})) ? $row->{$this->_instance_id_column} : $i;
+                $instances[$key] = $row;
+            }
+
+            return $instances;
+        }
+
+
         /**
          * Tell the ORM that you are expecting multiple results
          * from your query, and execute it. Will return a result set object
@@ -693,14 +711,21 @@ protected function _add_result_column($expr, $alias=null) {
 
         /**
          * Add a column to the list of columns returned by the SELECT
-         * query. This defaults to '*'. The second optional argument is
+         * query. This defaults to '*'. 
+         * $column can be a string of columns to select separated by comma
+         * The second optional argument is
          * the alias to return the column as.
          */
         public function select($column, $alias=null) {
-            $column = $this->_quote_identifier($column);
-            return $this->_add_result_column($column, $alias);
+            $columns = array_map('trim',explode(',',$column));
+            foreach($columns as $column){
+                $column = $this->_quote_identifier($column);
+                $this->_add_result_column($column, $alias);
+            }
+            return $this;
         }
 
+
         /**
          * Add an unquoted expression to the list of columns returned
          * by the SELECT query. The second optional argument is
@@ -1570,6 +1595,7 @@ public function id() {
          */
         public function set($key, $value = null) {
             $this->_set_orm_property($key, $value);
+            return $this;
         }
 
         /**
@@ -1583,6 +1609,7 @@ public function set($key, $value = null) {
          */
         public function set_expr($key, $value = null) {
             $this->_set_orm_property($key, $value, true);
+            return $this;
         }
 
         /**
@@ -1931,6 +1958,22 @@ public function as_array() {
         public function count() {
             return count($this->_results);
         }
+        
+        /**
+         * Get the first element of the result set
+         * @return Model
+         */
+        public function first(){
+            return reset($this->get_results());
+        }
+
+        /**
+         * Get the last element of the result set
+         * @return Model
+         */
+        public function last(){
+            return end($this->get_results());
+        }
 
         /**
          * Get an iterator for this object. In this case it supports foreaching