图书实例详情页面和挑战

// Display detail page for a specific BookInstance.
exports.bookinstance_detail = asyncHandler(async (req, res, next) => {
  const bookInstance = await BookInstance.findById(req.params.id)
    .populate("book")
    .exec();

  if (bookInstance === null) {
    // No results.
    const err = new Error("Book copy not found");
    err.status = 404;
    return next(err);
  }

  res.render("bookinstance_detail", {
    title: "Book:",
    bookinstance: bookInstance,
  });
});

extends layout

block content

  h1 ID: #{bookinstance._id}

  p #[strong Title: ]
    a(href=bookinstance.book.url) #{bookinstance.book.title}
  p #[strong Imprint:] #{bookinstance.imprint}

  p #[strong Status: ]
    if bookinstance.status=='Available'
      span.text-success #{bookinstance.status}
    else if bookinstance.status=='Maintenance'
      span.text-danger #{bookinstance.status}
    else
      span.text-warning #{bookinstance.status}

  if bookinstance.status!='Available'
    p #[strong Due back:] #{bookinstance.due_back}