Start to implement the mark_seen method

src/data/notification.rs

@@ -151,4 +151,46 @@ pub struct Notification {
     pub visibility: NotifEventVisibility,
     pub container_id: Option<u64>,
     pub container_type: Option<NotifElemType>,
+}
+
+pub struct PartialNotification {
+    pub id: Option<u64>,
+    pub time_create: Option<u64>,
+    pub seen: Option<bool>,
+    pub from_user_id: Option<UserID>,
+    pub dest_user_id: Option<UserID>,
+    pub on_elem_id: Option<u64>,
+    pub on_elem_type: Option<NotifElemType>,
+    pub kind: Option<NotifEventType>,
+    pub visibility: Option<NotifEventVisibility>,
+    pub container_id: Option<u64>,
+    pub container_type: Option<NotifElemType>,
+}
+
+impl PartialNotification {
+    pub fn new() -> PartialNotification {
+        PartialNotification {
+            id: None,
+            time_create: None,
+            seen: None,
+            from_user_id: None,
+            dest_user_id: None,
+            on_elem_id: None,
+            on_elem_type: None,
+            kind: None,
+            visibility: None,
+            container_id: None,
+            container_type: None,
+        }
+    }
+
+    pub fn set_id(mut self, id: u64) -> PartialNotification {
+        self.id = Some(id);
+        self
+    }
+
+    pub fn set_dest_user_id(mut self, id: &UserID) -> PartialNotification {
+        self.dest_user_id = Some(id.clone());
+        self
+    }
 }