如何在 Django 管理面板中列出所有与外键相关的对象?

2022-01-25 00:00:00 python django django-admin

问题描述

我想用 django 管理面板实现一个非常简单的功能，但到目前为止我找不到正确的方法:

I would like to implement a very simple feature with the django admin panel but I couldn't find the right way to achieve this so far:

模型.py

class Author(models.Model):
    name = models.CharField()

class Books(models.Model):
    title = models.CharField()
    author = models.ForeignKey(Author)

admin.py

class AuthorAdmin(admin.ModelAdmin):
    pass
admin.site.register(Author, AuthorAdmin)

如何为作者列表概览中的每个项目(作者)添加超链接，以链接到显示特定作者所有书籍的视图?例如:

How can I add a hyperlink to every item (Author) in the authors' list overview that links to a view showing all books of the specific author? For Example:

  • J.K.罗琳(书籍)
  • J.R.R.托尔金(书籍)

books 是指向显示作者所有书籍的网站的超链接.

where books is a hyperlink to a site showing all books of the author.

解决方案

您正在寻找一个 ModelAdmin.list_filter.

设置 list_filter 以激活管理员更改列表页面右侧栏中的过滤器.listfilter 可以是字段名，其中指定的字段应该是 BooleanField、CharField、DateField、DateTimeField、IntegerField、ForeignKey 或 ManyToManyField，例如:

Set list_filter to activate filters in the right sidebar of the change list page of the admin. A listfilter can be a field name, where the specified field should be either a BooleanField, CharField, DateField, DateTimeField, IntegerField, ForeignKey or ManyToManyField, for example:

 # Add a list filter author to BookAdmin.
 # Now you can filter books by author.
 class BookAdmin(ModelAdmin):
    list_filter = ('author', )

现在您可以使用@Wolph 建议在作者列表显示中添加一个链接.此链接指向按作者过滤的书单:

Now you can use @Wolph suggestion to add a link in the Author list_display. This link points to the book list filtered by author:

# Add hyperlinks to AuthorAdmin.
# Now you can jump to the book list filtered by autor. 
class AuthorAdmin(admin.ModelAdmin):
    def authors(self):
        return '<a href="/admin/appname/book/?author__id__exact=%d">%s</a>' % (self.author_id, self.author)
    authors.allow_tags = True

替代方案.要保存点击，您还可以直接指向图书的更改视图:

ALTERNATIVE. To save a click you can also point to the change view of a book directly:

class Books(models.Model):
    title = models.CharField()
    author = models.ForeignKey(Author)

def get_admin_url(self):
    return "/admin/appname/books/%d/" %self.id


class BookAdmin(admin.ModelAdmin):
    def authors(self):
        html = ""
        for obj in Books.objects.filter(author__id_exact=self.id):
            html += '<p><a href="%s">%s</a></p>' %(obj.get_admin_url(), obj.title)
        return html
    authors.allow_tags = True

    list_display = ['title', authors]

免责声明:未经测试，但如果您修正错字，它会起作用！:)

Disclaimer: Not tested, but if you fix the typo's it'll work! :)

请注意，这些链接也可以在管理员的其他位置注入.当您将其添加到小部件时，您可以从更改视图转到更改视图.

Note that these links can also be injected at other points in the admin. When you add it to a widget, you can go from change view to change view.

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