内容表

• Controller
• 视图
• Genre list page—challenge!
• 下一步

Author list page and Genre list page challenge

The author list page needs to display a list of all authors in the database, with each author name linked to its associated author detail page. The date of birth and date of death should be listed after the name on the same line.

Controller

The author list controller function needs to get a list of all 作者 instances, and then pass these to the template for rendering.

打开 /controllers/authorController.js . Find the exported author_list() controller method near the top of the file and replace it with the following code.

// Display list of all Authors.
exports.author_list = function(req, res, next) {
  Author.find()
    .sort([['family_name', 'ascending']])
    .exec(function (err, list_authors) {
      if (err) { return next(err); }
      //Successful, so render
      res.render('author_list', { title: 'Author List', author_list: list_authors });
    });
};

						

The method uses the model's find() , sort() and exec() functions to return all 作者 objects sorted by family_name in alphabetic order. The callback passed to the exec() method is called with any errors (or null ) as the first parameter, or a list of all authors on success. If there is an error it calls the next middleware function with the error value, and if not it renders the author_list (.pug) template, passing the page title and the list of authors ( author_list ).

视图

创建 /views/author_list.pug and replace its content with the text below.

extends layout
block content
  h1= title
  ul
    each author in author_list
      li
        a(href=author.url) #{author.name}
        |  (#{author.date_of_birth} - #{author.date_of_death})
    else
      li There are no authors.

						

Run the application and open your browser to http://localhost:3000/ . Then select the All authors link. If everything is set up correctly, the page should look something like the following screenshot.

注意： The appearance of the author lifespan dates is ugly! You can improve this using the same approach as we used for the BookInstance list (adding the virtual property for the lifespan to the 作者 model).

However, as the author may not be dead or may have missing birth/death data, in this case we need to ignore missing dates or references to nonexistent properties. One way to deal with this is to return either a formatted date, or a blank string, depending on whether the property is defined. For example:

return this.date_of_birth ? DateTime.fromJSDate(this.date_of_birth).toLocaleString(DateTime.DATE_MED) : '';

Genre list page—challenge!

In this section you should implement your own genre list page. The page should display a list of all genres in the database, with each genre linked to its associated detail page. A screenshot of the expected result is shown below.

The genre list controller function needs to get a list of all Genre instances, and then pass these to the template for rendering.

1. You will need to edit genre_list() in /controllers/genreController.js .
2. The implementation is almost exactly the same as the author_list() controller.
   • Sort the results by name, in ascending order.
3. The template to be rendered should be named genre_list.pug .
4. The template to be rendered should be passed the variables title ('Genre List') and genre_list (the list of genres returned from your Genre.find() callback).
5. The view should match the screenshot/requirements above (this should have a very similar structure/format to the Author list view, except for the fact that genres do not have dates).

下一步

Return to Express Tutorial Part 5: Displaying library data .

Proceed to the next subarticle of part 5: Genre detail page .

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最后修改： Jan 28, 2022 , 由 MDN 贡献者