diff --git a/src/ORM/Manager.php b/src/ORM/Manager.php
index 075c05f..c79d5b0 100644
--- a/src/ORM/Manager.php
+++ b/src/ORM/Manager.php
@@ -146,7 +146,7 @@ public function fetchObjectsByLabelAndProps(string $model_class, array $props, a
         return $objects;
     }
 
-    public function createObject(ModelAbstract $object)
+    public function createNode(ModelAbstract $object)
     {
         $entity = $object->getEntityType();
 
@@ -177,7 +177,7 @@ public function createObject(ModelAbstract $object)
         try {
             $result = $this->_neo4j_client->executeQuery($query, $params);
             $info = $result->getSingleResult()[0]['info'];
-            return $object->withProperties($info);
+            return $object->withProperties($info, $this);
             //print_r($result->getSingleResult());exit;
         } catch (HttpClient\Exception\CypherQueryException $e) {
             if ($e->isConstraintViolation()) {
@@ -292,6 +292,134 @@ public function loadRelationsForNode(NodeModelAbstract $node, array $relation_ty
 
     }
 
+    public function saveNode(NodeModelAbstract $node) : NodeModelAbstract
+    {
+        $modified_properties = $node->getModifiedProperties();
+
+        if (!$modified_properties) {
+            return $node;
+        }
+
+
+        $primary_id_info = $node->getPrimaryIdInfo();
+        $model_class = get_class($node);
+
+        $entity = $node::ENTITY;
+
+        $key = $primary_id_info['name'];
+
+        $query = "MATCH (n:$entity{{$key}:{id}})
+                  WITH n
+                  SET n += {props}
+                  WITH n, ID(n) as neo4j_id
+                  RETURN n{.*, neo4j_id} as info";
+
+        $params = ['id' => $primary_id_info['value'], 'props' => $modified_properties];
+
+        $result = $this->_neo4j_client->executeQuery($query, $params);
+
+        $result = $result->getSingleResult();
+
+        if (!isset($result[0]['info'])) {
+            return null;
+        }
+
+        return new $model_class($result[0]['info'], $this);
+
+    }
+
+    public function deleteNode(NodeModelAbstract $node)
+    {
+        $primary_id_info = $node->getPrimaryIdInfo();
+
+        $entity = $node::ENTITY;
+
+        $key = $primary_id_info['name'];
+
+        $query = "MATCH (n:$entity{{$key}:{id}})
+                  WITH n
+                  DETACH DELETE n";
+
+        $params = ['id' => $primary_id_info['value']];
+
+        $result = $this->_neo4j_client->executeQuery($query, $params);
+    }
+
+    public function saveRelationship(RelationshipModelAbstract $relationship)
+    {
+        $modified_properties = $relationship->getModifiedProperties();
+
+        if (!$modified_properties) {
+            return $relationship;
+        }
+
+        $from_node_info = $relationship->getStartNode()->getPropertyInfo();
+        $to_node_info = $relationship->getEndNode()->getPropertyInfo();
+
+        $n1_primary_field = $from_node_info['extra'][ModelAbstract::PROP_INFO_PRIMARY];
+        $n2_primary_field = $to_node_info['extra'][ModelAbstract::PROP_INFO_PRIMARY];
+
+        $n1_id = $from_node_info['props'][$n1_primary_field];
+        $n2_id = $to_node_info['props'][$n2_primary_field];
+
+        $relationship_type = $relationship->getEntityType();
+
+        $from_type = $relationship->getStartNode()->getEntityType();
+        $to_type = $relationship->getEndNode()->getEntityType();
+
+        $query = "
+                 MATCH (n1:{$from_type}{{$n1_primary_field}:{n1_id}}), (n2:{$to_type}{{$n2_primary_field}:{n2_id}})
+                 WITH n1, n2
+                 MATCH (n1)-[r:{$relationship_type}]->(n2)
+                 WHERE ID(r)={relationship_neo4j_id}
+                 WITH r
+                 SET r += {props}
+                 WITH r, ID(r) as neo4j_id
+                 RETURN r{.*, neo4j_id} as info
+              ";
+
+        $result = $this->_neo4j_client->executeQuery($query, [
+            'n1_id' => $n1_id,
+            'n2_id' => $n2_id,
+            'relationship_neo4j_id' => $relationship->getNeo4jId(),
+            'props' => $modified_properties,
+        ]);
+
+        return $relationship->withProperties($result->getSingleResult()[0]['info']);
+    }
+
+    public function deleteRelationship(RelationshipModelAbstract $relationship)
+    {
+        $from_node_info = $relationship->getStartNode()->getPropertyInfo();
+        $to_node_info = $relationship->getEndNode()->getPropertyInfo();
+
+        $n1_primary_field = $from_node_info['extra'][ModelAbstract::PROP_INFO_PRIMARY];
+        $n2_primary_field = $to_node_info['extra'][ModelAbstract::PROP_INFO_PRIMARY];
+
+        $n1_id = $from_node_info['props'][$n1_primary_field];
+        $n2_id = $to_node_info['props'][$n2_primary_field];
+
+        $relationship_type = $relationship->getEntityType();
+
+        $from_type = $relationship->getStartNode()->getEntityType();
+        $to_type = $relationship->getEndNode()->getEntityType();
+
+        $query = "
+                 MATCH (n1:{$from_type}{{$n1_primary_field}:{n1_id}}), (n2:{$to_type}{{$n2_primary_field}:{n2_id}})
+                 WITH n1, n2
+                 MATCH (n1)-[r:{$relationship_type}]->(n2)
+                 WHERE ID(r)={relationship_neo4j_id}
+                 WITH r
+                 DELETE r
+              ";
+
+        $result = $this->_neo4j_client->executeQuery($query, [
+            'n1_id' => $n1_id,
+            'n2_id' => $n2_id,
+            'relationship_neo4j_id' => $relationship->getNeo4jId(),
+        ]);
+    }
+
     private function _getPropsInfo(array $props) : array {
 
     }
diff --git a/src/ORM/ModelAbstract.php b/src/ORM/ModelAbstract.php
index d45ce09..48431ef 100644
--- a/src/ORM/ModelAbstract.php
+++ b/src/ORM/ModelAbstract.php
@@ -38,7 +38,6 @@ abstract class ModelAbstract {
     protected $_manager;
 
     private $_neo4j_id;
-    private $_has_unsaved_changes;
 
     public function __construct(array $data = [], Manager $manager = null)
     {
@@ -89,6 +88,7 @@ public function __construct(array $data = [], Manager $manager = null)
                 $use_value = $data[$clean_prop_name];
             }
 
+            $prop_value['value'] = $use_value;
             $this->_field_info[$clean_prop_name] = $prop_value;
 
             if (($prop_value[self::PROP_INFO_TYPE] != self::TYPE_AUTO_INCREMENT && $prop_value[self::PROP_INFO_TYPE] != self::TYPE_RELATION) || is_numeric($use_value)) {
@@ -99,8 +99,6 @@ public function __construct(array $data = [], Manager $manager = null)
         }
 
         $this->_neo4j_id = $data['neo4j_id'] ?? null;
-        $this->_has_unsaved_changes = $this->_neo4j_id === null;
-
     }
 
     public function getPropertyInfo() : array
@@ -159,7 +157,30 @@ public static function fromDataList(array $infos) : array
         return $objects;
     }
 
-    public function set(string $property, $value) {
+    public function getModifiedProperties() : array
+    {
+        $property_info = $this->getPropertyInfo();
+
+        $modified_fields = [];
+        $modified_field = null;
+
+        foreach ($this->_field_info as $field_name => $field_info) {
+            if ($field_info['type'] != ModelAbstract::TYPE_RELATION && $field_info['value'] !== $property_info['props'][$field_name]) {
+                $modified_fields[$field_name] = $property_info['props'][$field_name];
+            } elseif ($field_info['type'] === ModelAbstract::TYPE_MODIFIED_ON) {
+                $modified_field = $field_name;
+            }
+        }
 
+        if ($modified_fields && $modified_field) {
+            $modified_fields[$modified_field] = time();
+        }
+
+        return $modified_fields;
+    }
+
+    public function getNeo4jId() : int
+    {
+        return $this->_neo4j_id;
     }
 }
diff --git a/src/ORM/NodeModelAbstract.php b/src/ORM/NodeModelAbstract.php
index 174fe5c..1a64716 100644
--- a/src/ORM/NodeModelAbstract.php
+++ b/src/ORM/NodeModelAbstract.php
@@ -4,9 +4,9 @@
 
 abstract class NodeModelAbstract extends ModelAbstract {
 
-    public function withProperties(array $properties) : ModelAbstract
+    public function withProperties(array $properties, Manager $manager = null) : ModelAbstract
     {
-        return new $this($properties, $this->_manager);
+        return new $this($properties, $manager ?? $this->_manager);
     }
 
     public function __get($name)
@@ -39,4 +39,18 @@ public function getRelationsInfo(array $relation_names) : array
         return $relations_info;
     }
 
+    public function getPrimaryIdInfo() : array
+    {
+        foreach ($this->_field_info as $field_name => $field_info) {
+            if (isset($field_info['primary']) && $field_info['primary'] === true) {
+                return [
+                    'name' => $field_name,
+                    'value' => $field_info['value'],
+                ];
+            }
+        }
+
+        // throw error!
+    }
+
 }