Add group by support in sql criteria.

model/SqlCriteria.php

@@ -8,6 +8,8 @@ class SqlCriteria
 
     private $where = array();
 
+    private $group_by = array();
+
     private $order = array('sort' => array(), 'order' => array());
 
     private $limit = '';
@@ -38,7 +40,7 @@ class SqlCriteria
      */
     public function find()
     {
-        return $this->model->find($this->select, $this->distinct, $this->where, $this->order, $this->limit, null, null, $this->sql_expression, $this->sql_expression_params);
+        return $this->model->find($this->select, $this->distinct, $this->where, $this->order, $this->limit, null, $this->group_by, $this->sql_expression, $this->sql_expression_params);
     }
 
     public function count()
@@ -96,6 +98,16 @@ class SqlCriteria
         return $this->whereNotIn($field, $value);
     }
 
+    public function groupBy($fields)
+    {
+        if (is_array($fields)) {
+            $this->group_by = $this->group_by + $fields;
+        } else {
+            $this->group_by[] = $fields;
+        }
+        return $this;
+    }
+
     /**
      * @param $field string Field @ex 'field'
      * @param $order_desc bool Descendant sort direction

model/SqlDbDriver.php

@@ -159,6 +159,30 @@ abstract class SqlDbDriver extends DbDriver
     }
 
     /**
+     * @param mixed $group_by
+     * @return string
+     * @throws ErrorException
+     */
+    public function groupByExpr($group_by)
+    {
+        if (empty($group_by)) {
+            return $group_by;
+        }
+
+        if (!is_array($group_by)) {
+            $group_by = array($group_by);
+        }
+        foreach ($group_by as &$term) {
+            if ($term instanceof DbExpr) {
+                $term = (string) $term;
+            } else {
+                $term = $this->quoteIdentifier($term);
+            }
+        }
+        return implode(',', $group_by);
+    }
+
+    /**
      * @param $select array
      * @param $distinct string|bool
      * @return string

model/SqlModel.php

@@ -206,11 +206,13 @@ abstract class SqlModel extends Model
     {
         $select = $this->db->selectExpr($select, $distinct);
         $where = $this->db->whereExpr($where);
+        $group_by = $this->db->groupByExpr($group_by);
         $order = isset($order['sort']) ? $this->order($order, $order['sort']) : false;
         $limit = $this->db->limitExpr($limit);
         $result_items = $this->fetchAll(
             (($sql_expression) ? $sql_expression : ('SELECT ' . $select . ' FROM ' . $this->table()))
                 . (($where) ? (' WHERE ' . $where) : '')
+                . (($group_by) ? (' GROUP BY ' . $group_by) : '')
                 . (($order) ? ($order) : '')
                 . (($limit) ? (' LIMIT ' . $limit) : ''),
             $sql_expression_params,