Function paginated_items

libs/orbit-essentials/src/pagination.rs:41–79

Paginates a list of items based on limit and offset.

(
    args: PaginatedItemsArgs<'_, T>,
)

/// Paginates a list of items based on limit and offset.
pub fn paginated_items<T>(
    args: PaginatedItemsArgs<'_, T>,
) -> Result<PaginatedData<T>, PaginationError>
where
    T: Clone,
{
    let offset = args.offset.unwrap_or(0) as usize;

    if let (Some(max_limit), Some(limit)) = (args.max_limit, args.limit) {
        if limit > max_limit {
            Err(PaginationError::MaxLimitExceeded { max: max_limit })?;
        }
    }

    let default_limit = args.default_limit.unwrap_or(match args.max_limit {
        Some(max_limit) => max_limit,
        None => DEFAULT_PAGINATION_LIMIT,
    });
    let limit = args.limit.unwrap_or(default_limit) as usize;

    let total = args.items.len();

    let next_offset = match (offset + limit) < total {
        true => Some((offset + limit) as u64),
        false => None,
    };

    let items = args
        .items
        .get(offset..std::cmp::min(offset + limit, total))
        .unwrap_or(&[])
        .to_vec();

    Ok(PaginatedData {
        items,
        next_offset,
        total: total as u64,
    })
}

#[cfg(test)]
mod tests {