Add array-pagination fn to Paginated.

common/src/model.rs

@@ -1,6 +1,7 @@
 mod bytesize;
 
 pub use bytesize::*;
+use std::cmp::min;
 
 use crate::db::limiter::Limiter;
 use sea_orm::{ConnectionTrait, DbErr, SelectorTrait};
@@ -73,6 +74,32 @@ pub struct Paginated {
  pub limit: u64,
 }
 
+impl Paginated {
+ pub fn paginate_array<T: Clone>(&self, vec: &[T]) -> PaginatedResults<T> {
+ // trying to start past the end of the vec
+ if self.offset as usize > vec.len() {
+ return PaginatedResults {
+ items: vec![],
+ total: vec.len() as u64,
+ };
+ }
+
+ if self.limit == 0 {
+ return PaginatedResults {
+ items: Vec::from(&vec[self.offset as usize..]),
+ total: vec.len() as u64,
+ };
+ }
+
+ let end = min(self.offset as usize + self.limit as usize, vec.len());
+
+ PaginatedResults {
+ items: Vec::from(&vec[self.offset as usize..end]),
+ total: vec.len() as u64,
+ }
+ }
+}
+
 mod default {
  pub(super) const fn limit() -> u64 {
  25
@@ -132,3 +159,49 @@ macro_rules! paginated {
  });
  };
 }
+
+#[cfg(test)]
+mod test {
+ use crate::model::Paginated;
+
+ #[test_log::test(test)]
+ fn paginated_vec() {
+ let data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+
+ let paginated = Paginated {
+ offset: 0,
+ limit: 0,
+ }
+ .paginate_array(&data);
+
+ assert_eq!(10, paginated.total);
+ assert_eq!(10, paginated.items.len());
+
+ let paginated = Paginated {
+ offset: 0,
+ limit: 5,
+ }
+ .paginate_array(&data);
+
+ assert_eq!(10, paginated.total);
+ assert_eq!(5, paginated.items.len());
+
+ let paginated = Paginated {
+ offset: 5,
+ limit: 0,
+ }
+ .paginate_array(&data);
+
+ assert_eq!(10, paginated.total);
+ assert_eq!(5, paginated.items.len());
+
+ let paginated = Paginated {
+ offset: 12,
+ limit: 0,
+ }
+ .paginate_array(&data);
+
+ assert_eq!(10, paginated.total);
+ assert_eq!(0, paginated.items.len());
+ }
+}