writeonce/docs/examples/site/chapter/controller.wo

-- chapter/controller.wo — the CONTROLLER for `/ch/:slug`. It queries the
-- model and fills the view components that sit beside it in this module;
-- a view receives VALUES, never a cursor.
use serve/http
use layout

pub class ShowChapter {
  fn handle(req: Req) -> Resp {
    let slug = req.params["slug"];
    if slug == nil {
      return html_error(404, "No such chapter", "The address names no chapter.");
    }
    let hits = from c in Chapter where c.slug == slug take 1 select c;
    if len(hits) == 0 {
      return html_error(404, "No such chapter", "Nothing is filed under that slug.");
    }
    let c = hits[0];
    let nav = ChapterNav { items: Chapters.links(), current: c.ord };
    let page = ChapterPage { ord: c.ord, title: c.title, body: c.body, chapter_nav: nav };
    let shell = reading_shell("writeonce — ${c.title}", page.render());
    return ok_html(shell.render());
  }
}