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pub mod cursor_based_pagination {
use serde::{Deserialize, Serialize};
#[derive(Deserialize, Serialize, Debug, Clone)]
pub struct Paging {
pub cursors: PagingCursors,
pub previous: Option<String>,
pub next: Option<String>,
}
#[derive(Deserialize, Serialize, Debug, Clone)]
pub struct PagingCursors {
pub before: Option<Box<str>>,
pub after: Option<Box<str>>,
}
impl Paging {
pub fn next_cursor(&self) -> Option<String> {
if self.next.is_some() {
self.cursors.after.as_ref().map(|after| after.to_string())
} else {
None
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_de_paging_for_cursor_based_pagination() {
let paging: cursor_based_pagination::Paging = serde_json::from_str(
r#"{
"cursors": {
"before": "QVFIUnk4X3VfWlhjc1ZA6R2FPNWJhMDNFWm90Qm1mT2hKUkF5NW1aa25hbWJiY0lnT1o3SWtKcW9UckxhcGR1YnBTd2x1aTktSWlrME4tUFljWU5tRTIwNldR",
"after": "QVFIUktSN2czMUNMNUxHWmJGYWkzUFBKTjNObWlaVHEzYTBua1ZA2X1BDaEM0bXhGdkhGZAkxkeDlrX2tkRkpQclRUWjlSaEtLZAWV3TlRPeUoyQVJ1VFpYTjR3"
}
}"#,
).unwrap();
assert_eq!(paging.next_cursor(), None);
}
}