facebook_graph_api_object_paging/
lib.rs1pub mod cursor_based_pagination {
5 use serde::{Deserialize, Serialize};
6
7 #[derive(Deserialize, Serialize, Debug, Clone)]
8 pub struct Paging {
9 pub cursors: PagingCursors,
10 pub previous: Option<String>,
11 pub next: Option<String>,
12 }
13
14 #[derive(Deserialize, Serialize, Debug, Clone)]
15 pub struct PagingCursors {
16 pub before: Option<Box<str>>,
17 pub after: Option<Box<str>>,
18 }
19
20 impl Paging {
21 pub fn next_cursor(&self) -> Option<String> {
22 if self.next.is_some() {
23 self.cursors.after.as_ref().map(|after| after.to_string())
24 } else {
25 None
26 }
27 }
28 }
29}
30
31#[cfg(test)]
32mod tests {
33 use super::*;
34
35 #[test]
36 fn test_de_paging_for_cursor_based_pagination() {
37 let paging: cursor_based_pagination::Paging = serde_json::from_str(
38 r#"{
39 "cursors": {
40 "before": "QVFIUnk4X3VfWlhjc1ZA6R2FPNWJhMDNFWm90Qm1mT2hKUkF5NW1aa25hbWJiY0lnT1o3SWtKcW9UckxhcGR1YnBTd2x1aTktSWlrME4tUFljWU5tRTIwNldR",
41 "after": "QVFIUktSN2czMUNMNUxHWmJGYWkzUFBKTjNObWlaVHEzYTBua1ZA2X1BDaEM0bXhGdkhGZAkxkeDlrX2tkRkpQclRUWjlSaEtLZAWV3TlRPeUoyQVJ1VFpYTjR3"
42 }
43 }"#,
44 ).unwrap();
45 assert_eq!(paging.next_cursor(), None);
46 }
47}