diff --git a/model/Db.php b/model/Db.php
index 0eec589..933b011 100644
--- a/model/Db.php
+++ b/model/Db.php
@@ -31,6 +31,7 @@ class Db
      * @param array $config Configuration array.
      *                       
      * @return DbDriver
+     * @throws InitializationException
      */
     static public function connect($name = 'default', $config = null)
     {
diff --git a/model/DbStatement.php b/model/DbStatement.php
index 26caba2..9ee5feb 100644
--- a/model/DbStatement.php
+++ b/model/DbStatement.php
@@ -66,6 +66,7 @@ abstract class DbStatement
 
     /**
      * @param string $field
+     * @return array Value of queried field for all matching rows
      */
     public function fetchColumn($field)
     {
@@ -78,6 +79,7 @@ abstract class DbStatement
 
     /**
      * @param string $field
+     * @return mixed Value of queried filed for first matching row
      */
     public function fetchField($field)
     {
@@ -108,6 +110,7 @@ abstract class DbStatement
     abstract public function numRows();
 
     /**
+     * @param mixed $request
      * @return bool
      */
     abstract protected function driverExecute($request);
diff --git a/model/Model.php b/model/Model.php
index fd4fd01..7af41aa 100644
--- a/model/Model.php
+++ b/model/Model.php
@@ -63,7 +63,6 @@ abstract class Model
 
     /**
      * @param array $data
-     * @param array $on_duplicate
      * @return int Id of inserted row
      */
     public function insert($data)
@@ -152,22 +151,22 @@ abstract class Model
     abstract public function delete($id);
 
     /**
-     * @param string $sql
-     * @param array $params
-     * @param string $field
-     * @param CacheKey $cache_key
+     * @param string $data Request
+     * @param array $params Request parameters
+     * @param string $field Requested field name
+     * @param CacheKey $cache_key Key for caching in
      */
     abstract protected function fetchField($data, $params = array(), $field, $cache_key = null);
 
     /**
-     * @param string $sql
-     * @param array $params
-     * @param CacheKey $cache_key
+     * @param string $data Request
+     * @param array $params Request parameters
+     * @param CacheKey $cache_key Key for caching in
      */
     abstract  protected function fetch($data, $params = array(), $cache_key = null);
 
     /**
-     * @param string $sql
+     * @param string $data
      * @param array $params
      * @param CacheKey $cache_key
      */
diff --git a/model/MongoDbCommand.php b/model/MongoDbCommand.php
index 319ac84..18bc7ee 100644
--- a/model/MongoDbCommand.php
+++ b/model/MongoDbCommand.php
@@ -22,6 +22,12 @@ class MongoCommandBuilder
 
     const COMMAND = 'Command';
 
+
+    /**
+     * @param string $type
+     * @param MongoCollection $collection
+     * @return MongoDbCommand
+     */
     static public function factory($type, $collection = null)
     {
         $class = ucfirst($type) . 'MongoCommand';
@@ -33,8 +39,18 @@ class MongoCommandBuilder
 
 abstract class MongoDbCommand
 {
+
+    /**
+     * @var MongoCollection
+     */
     protected $collection;
 
+    /**
+     * Execute Mongo command/query
+     *
+     * @return mixed
+     * @throws GeneralException
+     */
     public function execute()
     {
         if ($this->checkParams()) {
@@ -44,6 +60,12 @@ abstract class MongoDbCommand
         }
     }
 
+
+    /**
+     * @param string $name Parameter name
+     * @param mixed $value Parameter value
+     * @return MongoDbCommand
+     */
     public function bindParam($name, $value)
     {
         if (property_exists($this, $name)) {
@@ -52,12 +74,22 @@ abstract class MongoDbCommand
         return $this;
     }
 
+    /**
+     * @param MongoCollection $collection Mongo collection
+     * @return MongoDbCommand
+     */
     public function setCollection($collection)
     {
         $this->collection = $collection;
         return $this;
     }
 
+    /**
+     * Convert query parameters array to string
+     *
+     * @param array $array
+     * @return string
+     */
     protected function arrayToString($array)
     {
         $string =  '[';
diff --git a/model/MongoDriver.php b/model/MongoDriver.php
index 455b0a4..5af2a51 100644
--- a/model/MongoDriver.php
+++ b/model/MongoDriver.php
@@ -38,6 +38,12 @@ class MongoDriver extends NoSqlDbDriver
         return $this->query($command, $params)->affectedRows();
     }
 
+    /**
+     * @param string $collection Mongo collection name to search in
+     * @param array $condition Search conditions
+     * @param array $fields Fields to return in result set
+     * @return MongoStatement
+     */
     public function find($collection, $condition = array(), $fields = array())
     {
         $command = MongoCommandBuilder::factory(MongoCommandBuilder::FIND, $this->getCollection($collection));
@@ -49,17 +55,6 @@ class MongoDriver extends NoSqlDbDriver
         return $this->query($command, $params);
     }
 
-    public function get($collection, $condition, $fields = array())
-    {
-        $command = MongoCommandBuilder::factory(MongoCommandBuilder::FIND, $this->getCollection($collection));
-        $params = array(
-            'condition' => $condition,
-            'fields' => $fields,
-            'multiple' => false
-        );
-        return $this->query($command, $params);
-    }
-
     public function findAndModify($collection, $query, $update, $sort = array(), $field = array(), $upsert = false, $new = false, $remove = false)
     {
         $command = MongoCommandBuilder::factory(MongoCommandBuilder::COMMAND, $this->getCollection($collection));
@@ -123,10 +118,9 @@ class MongoDriver extends NoSqlDbDriver
     }
 
 
-
     /**
      * @param mixed $request
-     * @return DbStatement
+     * @return MongoStatement
      */
     public function prepare($request)
     {
diff --git a/model/MongoModel.php b/model/MongoModel.php
index 6bf7093..9a5c672 100644
--- a/model/MongoModel.php
+++ b/model/MongoModel.php
@@ -10,9 +10,20 @@
  * @since 2011-11-15
  */
 
+/**
+ * @property MongoDriver $db
+ */
 abstract class MongoModel extends Model
 {
 
+    /**
+     * @var string Mongo id field to use as key
+     */
+    protected $key = '_id';
+
+    /**
+     * @var bool Is Mongo key field uses original MongoId
+     */
     protected $useMongoId = true;
 
     public function __construct($connection = 'default')
@@ -20,16 +31,11 @@ abstract class MongoModel extends Model
         parent::__construct($connection);
     }
 
-    public function count($query = array(), $limit = 0, $skip = 0)
+    protected function count($query = array(), $limit = 0, $skip = 0)
     {
         return $this->db->count($this->table(), $query, $limit, $skip);
     }
 
-    public function find($condition = array(), $fields = array())
-    {
-        return $this->db->find($this->table(), $condition, $fields);
-    }
-
     public function get($id)
     {
         if ($this->useMongoId) {
@@ -37,7 +43,7 @@ abstract class MongoModel extends Model
                 $id = new MongoId($id);
             }
         }
-        return $this->db->get($this->table(), array('_id' => $id))->fetch();
+        return $this->fetch(array($this->key => $id));
     }
 
     public function batchInsert($data)
@@ -45,25 +51,42 @@ abstract class MongoModel extends Model
         return $this->db->insert($this->table(), $data, true);
     }
 
-    public function delete($id)
+    public function update($data, $where)
     {
         if ($this->useMongoId) {
-            if (!$id instanceof MongoId) {
-                $id = new MongoId($id);
+            if (!$where instanceof MongoId) {
+                $where = new MongoId($where);
             }
         }
-        return $this->db->delete($this->table(), array('_id' => $id));
+        return $this->db->update($this->table(), $data, array($this->key => $where));
     }
 
-    public function deleteAll($query = array())
+    public function delete($id)
     {
-        $this->db->delete($this->table(), $query);
+        if ($this->useMongoId) {
+            if (!$id instanceof MongoId) {
+                $id = new MongoId($id);
+            }
+        }
+        return $this->db->delete($this->table(), array($this->key => $id));
     }
 
+    /**
+     * @param array $data Request
+     * @param array $params Request parameters
+     * @param string $field Requested field name
+     * @param CacheKey $cache_key Key for caching in
+     * @return mixed
+     */
     protected function fetchField($data, $params = array(), $field, $cache_key = null)
     {
         if (!$cache_key || !$result = $cache_key->get()) {
-            $result = $this->db->find($this->table(), $data, array($field => 1))->fetchField($field);
+            $result = $this->db
+                    ->find($this->table(), $data, array($field => 1))
+                    ->limit($this->getLimit($params))
+                    ->skip($this->getSkip($params))
+                    ->order($this->getOrder($params))
+                    ->fetchField($field);
             if ($cache_key) {
                 $cache_key->set($result);
             }
@@ -71,10 +94,21 @@ abstract class MongoModel extends Model
         return $result;
     }
 
+    /**
+     * @param array $data Request
+     * @param array $params Request parameters
+     * @param CacheKey $cache_key Key for caching in
+     * @return mixed
+     */
     protected function fetch($data, $params = array(), $cache_key = null)
     {
         if (!$cache_key || !$result = $cache_key->get()) {
-            $result = $this->db->find($this->table(), $data)->fetch();
+            $result = $this->db
+                    ->find($this->table(), $data, $this->getFields($params))
+                    ->limit(1)
+                    ->skip($this->getSkip($params))
+                    ->order($this->getOrder($params))
+                    ->fetch();
             if ($cache_key) {
                 $cache_key->set($result);
             }
@@ -82,14 +116,105 @@ abstract class MongoModel extends Model
         return $result;
     }
 
+    /**
+     * @param array $data
+     * @param array $params
+     * @param CacheKey $cache_key
+     * @return array
+     */
     protected function fetchAll($data, $params = array(), $cache_key = null)
     {
         if (!$cache_key || !$result = $cache_key->get()) {
-            $result = $this->db->find($this->table(), $data)->fetchAll();
+            $result = $this->db
+                    ->find($this->table(), $data, $this->getFields($params))
+                    ->limit($this->getLimit($params))
+                    ->skip($this->getSkip($params))
+                    ->order($this->getOrder($params))
+                    ->fetchAll();
             if ($cache_key) {
                 $cache_key->set($result);
             }
         }
         return $result;
     }
+
+    /**
+     * @param array $params Parameters for find query
+     * @return int Query result limits rule
+     * */
+    private function getLimit($params = array())
+    {
+        return isset($params['limit']) ? (int) $params['limit'] : 0;
+    }
+
+    /**
+     * @param array $params Parameters for find query
+     * @return int Query result skip rule
+     * */
+    private function getSkip($params = array())
+    {
+        return isset($params['skip']) ? (int) $params['skip'] : 0;
+    }
+
+    /**
+     * @param array $params Parameters for find query
+     * @return array Query result sort rules
+     * @throws GeneralException
+     * */
+    private function getOrder($params = array())
+    {
+        $order = array();
+        if (isset($params['order'])) {
+            if (is_string($params['order'])) {
+                $order = array($params['order'] => 1);
+            } elseif (is_array($params['order'])) {
+                $order = $params['order'];
+            } else {
+                throw new GeneralException('Wrong order parameter given to query.');
+            }
+        }
+        return $order;
+    }
+
+    /**
+     * @param array $params Parameters for find query
+     * @return array Query result sort rules
+     * @throws GeneralException
+     * */
+    private function getFields($params)
+    {
+        $fields = array();
+        if (isset($params['fields'])) {
+            if (is_string($params['fields'])) {
+                $fields = array($params['fields'] => 1);
+            } elseif (is_array($params['fields'])) {
+                if (array_keys($params['fields']) === range(0, count($params['fields']) - 1)) {
+                    foreach ($params['fields'] as $filed) {
+                        $fields[$filed] = 1;
+                    }
+                } else {
+                    $fields = $params['fields'];
+                }
+            } else {
+                throw new GeneralException('Wrong fields parameter given to query.');
+            }
+        }
+        return $fields;
+    }
+
+    /**
+     * Sets the additional condition if it is set
+     *
+     * @param array $query Initial query
+     * @param string $filed Field name to set
+     * @param mixed $value Field value to set
+     * @return MongoModel Current model object
+     */
+    protected function addCondition(&$query, $filed, $value)
+    {
+        if(!is_null($value) && $value !== false) {
+            $query[$filed] = $value;
+        }
+        return $this;
+    }
 }
\ No newline at end of file
diff --git a/model/MongoStatement.php b/model/MongoStatement.php
index 49f4c53..221e49c 100644
--- a/model/MongoStatement.php
+++ b/model/MongoStatement.php
@@ -114,7 +114,7 @@ class MongoStatement extends DbStatement
             } else {
                 return false;
             }
-        } elseif (is_int($this->result)) {
+        } elseif (is_int($this->result) || $this->result instanceof MongoId) {
             return $this->result;
         }
         return false;
@@ -156,6 +156,9 @@ class MongoStatement extends DbStatement
                 if (is_array($result) && isset($result['values'])) {
                     $this->result = $result['values'];
                 }
+                if (is_array($result) && isset($result['upserted'])) {
+                    $this->result = $result['n'] > 1 ? $result['n'] : $result['upserted'];
+                }
             } elseif (is_int($result)) {
                 $this->result = $result;
             }
diff --git a/model/MySQLiDriver.php b/model/MySQLiDriver.php
index 76b060a..179815e 100644
--- a/model/MySQLiDriver.php
+++ b/model/MySQLiDriver.php
@@ -14,7 +14,7 @@
  */
 class MySQLiDriver extends SqlDbDriver
 {
-    
+
     public function insert($table, $bind, $on_duplicate = array())
     {
         $columns = array();
@@ -22,7 +22,7 @@ class MySQLiDriver extends SqlDbDriver
             $columns[] = $this->quoteIdentifier($col);
         }
         $values = array_values($bind);
-        
+
         if ($on_duplicate) {
             $update = array();
             foreach ($on_duplicate as $col => $val) {
@@ -30,16 +30,16 @@ class MySQLiDriver extends SqlDbDriver
             }
             $on_duplicate = ' ON DUPLICATE KEY UPDATE ' . implode(', ', $update);
         }
-        
+
         $sql = 'INSERT INTO ' . $this->quoteIdentifier($table)
-             . ' (' . implode(', ', $columns) . ') VALUES (' . $this->quote($values) . ')'
-             . (($on_duplicate) ? $on_duplicate : '');
+                . ' (' . implode(', ', $columns) . ') VALUES (' . $this->quote($values) . ')'
+                . (($on_duplicate) ? $on_duplicate : '');
         return $this->query($sql)->affectedRows();
     }
-    
+
     /**
      * @param mixed $sql
-     * @return DbStatement
+     * @return MySQLiStatement
      */
     public function prepare($sql)
     {
@@ -50,73 +50,73 @@ class MySQLiDriver extends SqlDbDriver
     {
         return $this->connection->insert_id;
     }
-    
+
     public function isConnected()
     {
         return ($this->connection instanceof MySQLi);
     }
-    
+
     public function disconnect()
     {
         if ($this->isConnected()) {
             $this->connection->close();
         }
-        $this->connection = null;                                       
+        $this->connection = null;
     }
-    
+
     protected function connect()
     {
         if ($this->connection) {
             return;
         }
-        
+
         $port = isset($this->config['port']) ? (int) $this->config['port'] : null;
         $this->connection = mysqli_init();
-        $connected = @mysqli_real_connect($this->connection, 
-                                          $this->config['hostname'], 
-                                          $this->config['username'], 
-                                          $this->config['password'], 
-                                          $this->config['database'], 
-                                          $port);
+        @mysqli_real_connect($this->connection,
+            $this->config['hostname'],
+            $this->config['username'],
+            $this->config['password'],
+            $this->config['database'],
+            $port);
         // Connection errors check
         if (mysqli_connect_error()) {
             throw new GeneralException(mysqli_connect_error(), mysqli_connect_errno());
         }
-        
+
         $charset = (!empty($this->config['charset'])) ? $this->config['charset'] : 'utf8';
         $this->connection->set_charset($charset);
     }
-    
+
     protected function driverQuote($value)
     {
         if (is_int($value) || is_float($value)) {
             return $value;
         }
-        
+
         if (is_bool($value)) {
             return (int) $value;
         }
-        
+
         if ($value === null) {
             return 'NULL';
         }
-        
+
         $this->connect();
         return '\'' . $this->connection->real_escape_string($value) . '\'';
     }
-    
+
     protected function driverBeginTransaction()
     {
         $this->connect();
         $this->connection->autocommit(false);
     }
-    
+
     protected function driverCommitTransaction()
     {
         $this->connection->commit();
         $this->connection->autocommit(true);
     }
-    
+
     protected function driverRollbackTransaction()
     {
         $this->connection->rollback();
diff --git a/model/MySQLiStatement.php b/model/MySQLiStatement.php
index a89adb4..5700d80 100644
--- a/model/MySQLiStatement.php
+++ b/model/MySQLiStatement.php
@@ -83,6 +83,7 @@ class MySQLiStatement extends DbStatement
      *
      * @param mixed $style
      * @return mixed
+     * @throws GeneralException
      */
     public function fetch($style = Db::FETCH_OBJ)
     {
@@ -90,7 +91,6 @@ class MySQLiStatement extends DbStatement
             return false;
         }
 
-        $row = false;
         switch ($style) {
             case Db::FETCH_OBJ:
                 $row = $this->result->fetch_object();
@@ -112,6 +112,7 @@ class MySQLiStatement extends DbStatement
 
     /**
      * @param string $class
+     * @return object
      */
     public function fetchObject($class = 'stdClass')
     {
diff --git a/model/SqlDbDriver.php b/model/SqlDbDriver.php
index fa86668..ec62c49 100644
--- a/model/SqlDbDriver.php
+++ b/model/SqlDbDriver.php
@@ -37,7 +37,7 @@ abstract class SqlDbDriver extends DbDriver
 
     /**
      * @param string $table
-     * @param mixed $bind
+     * @param mixed $data
      * @param mixed $on_duplicate
      * @return int Affected rows count
      */
@@ -56,9 +56,9 @@ abstract class SqlDbDriver extends DbDriver
 
     /**
      * @param string $table
-     * @param array $bind
-     * @param mixed $where
-     * @return int
+     * @param array $data
+     * @param mixed $condition
+     * @return int Number of updated rows
      */
     public function update($table, $data, $condition = '')
     {
@@ -74,7 +74,7 @@ abstract class SqlDbDriver extends DbDriver
 
     /**
      * @param string $table
-     * @param mixed $where
+     * @param mixed $condition
      * @return int
      */
     public function delete($table, $condition = '')
@@ -152,10 +152,6 @@ abstract class SqlDbDriver extends DbDriver
         return implode(' AND ', $where);
     }
 
-    /**
-     * @return DbStatement
-     */
-
     abstract protected function driverQuote($value);
 
     abstract protected function driverBeginTransaction();
diff --git a/model/SqlModel.php b/model/SqlModel.php
index 7724232..7eb98ae 100644
--- a/model/SqlModel.php
+++ b/model/SqlModel.php
@@ -10,6 +10,9 @@
  * @since 2011-11-11
  */
 
+/**
+ * @property SqlDbDriver $db
+ */
 abstract class SqlModel extends Model
 {
 
@@ -105,8 +108,10 @@ abstract class SqlModel extends Model
 
     /**
      * This method appends to params table and primary key.
-     * So they can be accessed thru `:table` and `:pk` placeholders.
+     * So they can be accessed through `:table` and `:pk` placeholders.
      *
+     * @param string $sql
+     * @param array $params
      * @return DbStatement
      */
     protected function query($sql, $params = array())
@@ -122,10 +127,11 @@ abstract class SqlModel extends Model
     }
 
     /**
-     * @param string $sql
-     * @param array $params
-     * @param string $field
-     * @param CacheKey $cache_key
+     * @param string $data Request
+     * @param array $params Request parameters
+     * @param string $field Requested field name
+     * @param CacheKey $cache_key Key for caching in
+     * @return mixed
      */
     protected function fetchField($data, $params = array(), $field, $cache_key = null)
     {
@@ -139,9 +145,10 @@ abstract class SqlModel extends Model
     }
 
     /**
-     * @param string $sql
-     * @param array $params
-     * @param CacheKey $cache_key
+     * @param string $data Request
+     * @param array $params Request parameters
+     * @param CacheKey $cache_key Key for caching in
+     * @return mixed
      */
     protected function fetch($data, $params = array(), $cache_key = null)
     {
@@ -155,9 +162,10 @@ abstract class SqlModel extends Model
     }
 
     /**
-     * @param string $sql
+     * @param string $data
      * @param array $params
      * @param CacheKey $cache_key
+     * @return array
      */
     protected function fetchAll($data, $params = array(), $cache_key = null)
     {
diff --git a/tests/model/MongoDbCommandTest.php b/tests/model/MongoDbCommandTest.php
index a6f2339..f8e5d0c 100644
--- a/tests/model/MongoDbCommandTest.php
+++ b/tests/model/MongoDbCommandTest.php
@@ -16,7 +16,7 @@ require_once dirname(__FILE__) . '/../../model/MongoDriver.php';
 require_once dirname(__FILE__) . '/../../model/MongoDbCommand.php';
 require_once dirname(__FILE__) . '/../../exception/GeneralException.php';
 
-class MongoDbCommandTest extends PHPUnit_Framework_TestCase
+class   MongoDbCommandTest extends PHPUnit_Framework_TestCase
 {
 
     private $conf = array();
@@ -323,11 +323,14 @@ class MongoDbCommandTest extends PHPUnit_Framework_TestCase
      */
     public function testToString()
     {
-        $cmd = MongoCommandBuilder::factory(MongoCommandBuilder::COUNT, new CollectionMock());
-        $cmd->bindParam('condition', array());
+        $cmd = MongoCommandBuilder::factory(MongoCommandBuilder::COUNT);
+        $this->assertSame('Command properties not set', $cmd->__toString());
+        $cmd->bindParam('collection', new CollectionMock());
         $this->assertStringStartsWith("\n" . 'Collection: CollectionMock', $cmd->__toString());
 
-        $cmd = MongoCommandBuilder::factory(MongoCommandBuilder::FIND, new CollectionMock());
+        $cmd = MongoCommandBuilder::factory(MongoCommandBuilder::FIND);
+        $this->assertSame('Command properties not set', $cmd->__toString());
+        $cmd->bindParam('collection', new CollectionMock());
         $cmd->bindParam('condition', array());
         $this->assertStringStartsWith("\n" . 'Collection: CollectionMock', $cmd->__toString());
         $this->assertContains('Condition: ' . '[]' . PHP_EOL, $cmd->__toString());
diff --git a/tests/model/MongoDriverTest.php b/tests/model/MongoDriverTest.php
index 63cfd1e..5a5352e 100644
--- a/tests/model/MongoDriverTest.php
+++ b/tests/model/MongoDriverTest.php
@@ -204,22 +204,6 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testGet()
-    {
-        Config::set('DEBUG', false);
-
-        $mongo = new MongoDriver($this->conf);
-        $eggs = $mongo->get('items', array('name' => 'eggs'))->fetchObject();
-        $this->assertEquals(20, $eggs->quantity);
-        $eggs = $mongo->get('items', array('name' => 'eggs'))->fetch();
-        $this->assertEquals('eggs', $eggs->name);
-        $this->assertInstanceOf('MongoId', $eggs->_id);
-    }
-
-    /**
-     * @runInSeparateProcess
-     * @group Mongo
-     */
     public function testRemove()
     {
         Config::set('DEBUG', false);
@@ -246,7 +230,7 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
         $this->assertNotEmpty($mongo->getInsertId());
         $this->assertEquals(2, $mongo->find('items', array('name' => 'bread'))->numRows());
         $this->assertEquals(0, $mongo->insert('items', array('name' => 'meat', 'weight' => 230)));
-        $this->assertEquals(230, $mongo->get('items', array('name' => 'meat'))->fetch()->weight);
+        $this->assertEquals(230, $mongo->find('items', array('name' => 'meat'))->fetch()->weight);
     }
 
     /**
@@ -304,7 +288,7 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
         $this->assertEquals(1, $mongo->find('items', array('name' => 'bread'))->numRows());
         $this->assertEquals(1, $mongo->update('items', array('$set' => array('price' => 200, 'date' => 'today')), array('name' => 'fish')));
         $this->assertEquals(2, $mongo->update('items', array('$set' => array('price' => 1)), array('name' => 'eggs')));
-        $fish = $mongo->get('items', array('name' => 'fish'))->fetch();
+        $fish = $mongo->find('items', array('name' => 'fish'))->fetch();
         $this->assertEquals(200, $fish->price);
         $this->assertEquals('today', $fish->date);
         $this->assertEquals(0, $mongo->update('items', array('$set' => array('price' => 200, 'date' => 'today')), array('name' => 'ball')));
@@ -321,8 +305,9 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
         $mongo = new MongoDriver($this->conf);
 
         $mongo->insert('items', array('name' => 'bread'));
-        $this->assertEquals(1, $mongo->update('items', array('$set' => array('price' => 200, 'date' => 'today')), array('name' => 'ball'), true, true));
-        $this->assertEquals('today', $mongo->get('items', array('name' => 'ball'))->fetch()->date);
+        $this->assertInstanceOf('MongoId', $mongo->update('items', array('$set' => array('price' => 200, 'date' => 'today')), array('name' => 'ball'), true, true));
+        $this->assertEquals('today', $mongo->find('items', array('name' => 'ball'))->fetch()->date);
+        $this->assertEquals(2, $mongo->update('items', array('$set' => array('price' => 200, 'date' => 'today')), array('name' => 'eggs'), true, true));
     }
 
     /**
@@ -335,10 +320,10 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
 
         $mongo = new MongoDriver($this->conf);
 
-        $this->assertEquals(10, $mongo->get('items', array('name' => 'bread'))->fetch()->quantity);
+        $this->assertEquals(10, $mongo->find('items', array('name' => 'bread'))->fetch()->quantity);
         $result = $mongo->findAndModify('items', array('name' => 'bread'), array('$set' => array('quantity' => 20)));
         $this->assertEquals(10, $result->fetch()->quantity);
-        $this->assertEquals(20, $mongo->get('items', array('name' => 'bread'))->fetch()->quantity);
+        $this->assertEquals(20, $mongo->find('items', array('name' => 'bread'))->fetch()->quantity);
     }
 
     /**
@@ -351,10 +336,10 @@ class MongoDriverTest extends PHPUnit_Framework_TestCase
 
         $mongo = new MongoDriver($this->conf);
 
-        $this->assertEquals(10, $mongo->get('items', array('name' => 'bread'))->fetch()->quantity);
+        $this->assertEquals(10, $mongo->find('items', array('name' => 'bread'))->fetch()->quantity);
         $result = $mongo->findAndModify('items', array('name' => 'breading'), array('$set' => array('quantity' => 20)))->fetch();
         $this->assertFalse($result);
-        $this->assertEquals(10, $mongo->get('items', array('name' => 'bread'))->fetch()->quantity);
+        $this->assertEquals(10, $mongo->find('items', array('name' => 'bread'))->fetch()->quantity);
     }
 
     /**
diff --git a/tests/model/MongoModelTest.php b/tests/model/MongoModelTest.php
index 848dc99..9f3abb0 100644
--- a/tests/model/MongoModelTest.php
+++ b/tests/model/MongoModelTest.php
@@ -13,6 +13,7 @@
 require_once dirname(__FILE__) . '/../../Registry.php';
 require_once dirname(__FILE__) . '/../../Config.php';
 require_once dirname(__FILE__) . '/../../cache/Cacher.php';
+require_once dirname(__FILE__) . '/../../exception/GeneralException.php';
 require_once dirname(__FILE__) . '/../../model/DbExpr.php';
 require_once dirname(__FILE__) . '/../../model/Db.php';
 require_once dirname(__FILE__) . '/../../model/MongoDbCommand.php';
@@ -27,8 +28,21 @@ require_once dirname(__FILE__) . '/../../model/MongoModel.php';
 class MongoModelTest extends PHPUnit_Framework_TestCase
 {
 
+    /**
+     * @var MongoModel
+     */
     private $model;
 
+    /**
+     * @var ReflectionMethod
+     */
+    private $method_count;
+
+    /**
+     * @var ReflectionMethod
+     */
+    private $method_fetch;
+
     public function run(PHPUnit_Framework_TestResult $result = NULL)
     {
         $this->setPreserveGlobalState(false);
@@ -47,6 +61,13 @@ class MongoModelTest extends PHPUnit_Framework_TestCase
         } else {
             $this->model = new MongoMockModel();
         }
+
+        $model = new ReflectionClass('MongoModel');
+        $this->method_count = $model->getMethod('count');
+        $this->method_count->setAccessible(true);
+        $this->method_fetch = $model->getMethod('fetch');
+        $this->method_fetch->setAccessible(true);
+
         set_new_overload(array($this, 'newCallback'));
     }
 
@@ -62,126 +83,204 @@ class MongoModelTest extends PHPUnit_Framework_TestCase
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testFind()
+    public function testFetch()
     {
         Config::set('DEBUG', false);
-        $result = $this->model->find();
-        $this->assertInstanceOf('MongoStatement', $result);
-        $this->assertEquals('milk', $result->limit(2)->order(array('name' => -1))->fetch()->name);
-        $this->assertEquals('fish', $result->fetch()->name);
-        $result = $this->model->find(array(), array('name'))->fetch();
+
+        $mock = $this->getMock('CacheKey', array('set', 'get'));
+        $mock->expects($this->once())
+                ->method('set')
+                ->will($this->returnValue(true));
+        $mock->expects($this->once())
+                ->method('get')
+                ->will($this->returnValue(false));
+
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => array('name' => -1), 'limit' => 2), $mock);
+        $this->assertInstanceOf('ArrayObject', $result);
+        $this->assertEquals('milk', $result->name);
+        $result = $this->method_fetch->invoke($this->model, array(), array('fields' => array('name')));
         $this->assertSame('bread', $result->name);
+        $result = $this->method_fetch->invoke($this->model, array());
         $this->setExpectedException('PHPUnit_Framework_Error');
-        $this->assertNull($result->price);
+        $this->assertNull($result->pounds);
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testGet()
+    public function testFetchField()
     {
         Config::set('DEBUG', false);
-        $result = $this->model->find()->limit(1)->order(array('name' => 1));
-        $result = $result->fetch();
-        $this->assertEquals('bread', $result->name);
-        $id = $result->_id;
-        $this->assertEquals(10, $this->model->get($id)->quantity);
+
+        $mock = $this->getMock('CacheKey', array('set', 'get'));
+        $mock->expects($this->exactly(2))
+                ->method('set')
+                ->will($this->returnValue(true));
+        $mock->expects($this->exactly(2))
+                ->method('get')
+                ->will($this->returnValue(false));
+
+        $model = new ReflectionClass('MongoModel');
+        $method = $model->getMethod('fetchField');
+        $method->setAccessible(true);
+
+        $result = $method->invoke($this->model, array('name' => 'milk'), array(), 'quantity', $mock);
+        $this->assertEquals(1, $result);
+        $result = $method->invoke($this->model, array(), array('skip' => 2), 'quantity', $mock);
+        $this->assertEquals($result, $this->method_fetch->invoke($this->model, array(), array('skip' => 2))->quantity);
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testDelete()
+    public function testFetchAll()
     {
         Config::set('DEBUG', false);
-        $result = $this->model->find()->limit(1)->order(array('name' => 1));
-        $id = $result->fetch()->_id;
-        $this->assertEquals(1, $this->model->delete($id));
-        $this->assertFalse($this->model->find(array('name' => 'bread'))->fetch());
+
+        $mock = $this->getMock('CacheKey', array('set', 'get'));
+        $mock->expects($this->once())
+                ->method('set')
+                ->will($this->returnValue(true));
+        $mock->expects($this->once())
+                ->method('get')
+                ->will($this->returnValue(false));
+
+        $model = new ReflectionClass('MongoModel');
+        $method = $model->getMethod('fetchAll');
+        $method->setAccessible(true);
+
+        $result = $method->invoke($this->model, array('name' => 'eggs'), array(), $mock);
+        $this->assertEquals(2, count($result));
+        $result = $method->invoke($this->model, array(), array('skip' => 2));
+        $this->assertEquals(3, count($result));
+        $this->assertEquals('fish', $result[0]->name);
+        $this->assertEquals('milk', $result[1]->name);
+        $this->assertEquals('eggs', $result[2]->name);
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testBatchInsert()
+    public function testFetchOrderParam()
     {
         Config::set('DEBUG', false);
-        $data = array(
-            array('name' => 'first object'),
-            array('name' => 'second object'),
-            array('name' => 'equal object'),
-            array('name' => 'equal object')
-        );
-        $this->model->batchInsert($data);
-        $this->assertEquals(1, $this->model->count(array('name' => 'first object')));
-        $this->assertEquals(2, $this->model->count(array('name' => 'equal object')));
-        $this->model->batchInsert(array());
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => 'name'));
+        $this->assertSame('bread', $result->name);
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => array('name' => 1, 'quantity' => -1), 'skip' => 1));
+        $this->assertSame(2.1, $result->price);
+        $this->setExpectedException('GeneralException', 'Wrong order parameter given to query.');
+        $this->method_fetch->invoke($this->model, array(), array('order' => 1));
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testDeleteAll()
+    public function testFetchSkipLimitParam()
     {
         Config::set('DEBUG', false);
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => 'name'));
+        $this->assertSame('bread', $result->name);
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => array('name' => 1, 'quantity' => -1), 'skip' => 1, 'limit' => 1));
+        $this->assertSame(2.1, $result->price);
 
-        $this->assertEquals(2, $this->model->count(array('name' => 'eggs')));
-        $this->assertEquals(0, $this->model->deleteAll(array('name' => 'eggs')));
-        $this->assertFalse($this->model->find(array('name' => 'eggs'))->fetch());
+        $model = new ReflectionClass('MongoModel');
+        $method = $model->getMethod('fetchAll');
+        $method->setAccessible(true);
+        $this->assertCount(3, $method->invoke($this->model, array(), array('limit' => 3)));
+        $this->assertCount(2, $method->invoke($this->model, array(), array('skip' => 3)));
+        $this->assertCount(5, $method->invoke($this->model, array(), array()));
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testCount()
+    public function testFetchFieldsParam()
     {
         Config::set('DEBUG', false);
-        $this->assertEquals(5, $this->model->count());
-        $this->assertEquals(2, $this->model->count(array('name' => 'eggs')));
+        $result = $this->method_fetch->invoke($this->model, array(), array('fields' => 'name'));
+        $this->assertTrue(!isset($result->quantity));
+        $result = $this->method_fetch->invoke($this->model, array(), array('fields' => array('name', 'price')));
+        $this->assertTrue(!isset($result->quantity));
+        $result = $this->method_fetch->invoke($this->model, array(), array('fields' => array('name' => 1, 'price' => 1)));
+        $this->assertTrue(!isset($result->quantity));
+        $this->setExpectedException('GeneralException', 'Wrong fields parameter given to query.');
+        $this->method_fetch->invoke($this->model, array(), array('fields' => 1));
     }
 
     /**
      * @runInSeparateProcess
      * @group Mongo
      */
-    public function testFetch()
+    public function testGet()
     {
         Config::set('DEBUG', false);
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => array('name' => 1)));
+        $this->assertEquals('bread', $result->name);
+        $id = $result->_id;
+        $this->assertEquals(10, $this->model->get($id)->quantity);
+    }
 
-        $mock = $this->getMock('CacheKey', array('set', 'get'));
-        $mock->expects($this->exactly(3))
-                ->method('set')
-                ->will($this->returnValue(true));
-        $mock->expects($this->exactly(3))
-                ->method('get')
-                ->will($this->returnValue(false));
-
-        $model = new ReflectionClass('MongoModel');
-        $method = $model->getMethod('fetchField');
-        $method->setAccessible(true);
-
-        $result = $method->invoke($this->model, array('name' => 'milk'), array(), 'quantity', $mock);
-        $this->assertEquals(1, $result);
-
-        $model = new ReflectionClass('MongoModel');
-        $method = $model->getMethod('fetch');
-        $method->setAccessible(true);
+    /**
+     * @runInSeparateProcess
+     * @group Mongo
+     */
+    public function testDelete()
+    {
+        Config::set('DEBUG', false);
+        $result = $this->method_fetch->invoke($this->model, array(), array('order' => array('name' => 1)));
+        $id = $result->_id;
+        $this->assertEquals(1, $this->model->delete($id));
+        $this->assertFalse($this->method_fetch->invoke($this->model, array('name' => 'bread')));
+    }
 
-        $result = $method->invoke($this->model, array('name' => 'bread'), array(), $mock);
-        $this->assertEquals('bread', $result->name);
+    /**
+     * @runInSeparateProcess
+     * @group Mongo
+     */
+    public function testUpdate()
+    {
+        Config::set('DEBUG', false);
+        $this->model->insert(array('name' => 'testbread', 'price' => 3.2, 'quantity' => 10));
+        $result = $this->method_fetch->invoke($this->model, array('name' => 'testbread'));
+        $this->assertEquals(10, $result->quantity);
+        $this->model->update(array('$set' => array('quantity' => 3)), $result->_id);
+        $this->assertEquals(3, $this->model->get($result->_id)->quantity);
+        $this->model->update(array('$set' => array('quantity' => 13)), (string)$result->_id);
+        $this->assertEquals(13, $this->model->get($result->_id)->quantity);
+    }
 
-        $model = new ReflectionClass('MongoModel');
-        $method = $model->getMethod('fetchAll');
-        $method->setAccessible(true);
+    /**
+     * @runInSeparateProcess
+     * @group Mongo
+     */
+    public function testBatchInsert()
+    {
+        Config::set('DEBUG', false);
+        $data = array(
+            array('name' => 'first object'),
+            array('name' => 'second object'),
+            array('name' => 'equal object'),
+            array('name' => 'equal object')
+        );
+        $this->model->batchInsert($data);
+        $this->assertEquals(1, $this->method_count->invoke($this->model, array('name' => 'first object')));
+        $this->assertEquals(2, $this->method_count->invoke($this->model, array('name' => 'equal object')));
+    }
 
-        $result = $method->invoke($this->model, array('name' => 'eggs'), array(), $mock);
-        $this->assertEquals(2, count($result));
-        $this->assertEquals('eggs', $result[0]->name);
+    /**
+     * @runInSeparateProcess
+     * @group Mongo
+     */
+    public function testCount()
+    {
+        Config::set('DEBUG', false);
+        $this->assertEquals(5, $this->method_count->invoke($this->model));
+        $this->assertEquals(2, $this->method_count->invoke($this->model, array('name' => 'eggs')));
     }
 
     /**
@@ -208,11 +307,11 @@ class MongoModelTest extends PHPUnit_Framework_TestCase
 
         $this->model->insert(array('_id' => 1, 'name' => 'testbread', 'price' => 3.2, 'quantity' => 10));
         $this->model->insert(array('_id' => 2, 'name' => 'testbread', 'price' => 12, 'quantity' => 2));
-        $this->assertSame(2, $this->model->count(array('name' => 'testbread')));
+        $this->assertSame(2, $this->method_count->invoke($this->model, array('name' => 'testbread')));
 
         $prop->setValue($this->model, false);
         $this->model->delete(1);
-        $this->assertSame(1, $this->model->count(array('name' => 'testbread')));
+        $this->assertSame(1, $this->method_count->invoke($this->model, array('name' => 'testbread')));
     }
 
     /**
@@ -225,13 +324,13 @@ class MongoModelTest extends PHPUnit_Framework_TestCase
 
         $this->model->insert(array('name' => 'testbread', 'price' => 3.2, 'quantity' => 10));
         $this->model->insert(array('name' => 'testbread', 'price' => 12, 'quantity' => 2));
-        $this->assertSame(2, $this->model->count(array('name' => 'testbread')));
-        $id = $this->model->find(array('name' => 'testbread'))->limit(1)->fetch()->_id->__toString();
+        $this->assertSame(2, $this->method_count->invoke($this->model, array('name' => 'testbread')));
+        $id = $this->method_fetch->invoke($this->model, array('name' => 'testbread'))->_id->__toString();
         $this->assertInternalType('string', $id);
         $item = $this->model->get($id);
         $this->assertSame('testbread', $item->name);
         $this->model->delete($id);
-        $this->assertSame(1, $this->model->count(array('name' => 'testbread')));
+        $this->assertSame(1, $this->method_count->invoke($this->model, array('name' => 'testbread')));
     }
 
     public function tearDown()
@@ -242,7 +341,7 @@ class MongoModelTest extends PHPUnit_Framework_TestCase
         $db = $connection->selectDB($conf['database']);
         $db->authenticate($conf['username'], $conf['password']);
         $collection = 'mongomock';
-        $db->dropCollection($collection);
+        $db->selectCollection($collection)->remove(array());
     }
 
     protected function newCallback($className)