django - Django：返回所有作者创作的所有书籍

Question

我有这些模型：

class Author(models.Model):
#id         = models.IntegerField(blank=True)
code            = models.CharField(verbose_name="Author Code", max_length=100, unique=True)
firstname   = models.CharField(verbose_name="First Name", max_length=200)
lastname        = models.CharField(verbose_name="Last Name",max_length=200)

#Optional Fields
middlename  = models.CharField(verbose_name="Middlename", max_length=200, null=True, blank=True)
email       = models.EmailField(verbose_name="Author's Email",max_length=75, null=True, blank=True)
sex         = models.CharField(verbose_name="Sex", max_length=1, choices=(('M', 'Male'), ('F', 'Female')), null=True, blank=True)
salutation  = models.CharField(verbose_name="Salutation",max_length=10, null=True, blank=True)
suffix      = models.CharField(verbose_name="Suffix", max_length=10, null=True, blank=True)

def __unicode__(self):
    return u'%s %s (%s)' % (self.firstname, self.lastname, self.code)


class Book(models.Model):
#book title
#book_id                = models.IntegerField(blank=True)
title           = models.CharField(verbose_name="Book Title", max_length=200)
subtitle        = models.CharField(verbose_name="Book Subtitle", max_length=200, null=True, blank=True)

#Reference information
accession_number    = models.CharField(verbose_name="Accession Number", max_length=100)
call_number = models.CharField(verbose_name="Call Number", max_length=100)
isbn            = models.CharField(verbose_name="ISBN Code", max_length=100, null=True, blank=True, unique=False)
dewey_class = models.ForeignKey(DeweyClass, verbose_name="Dewey Class", null=True, default=False, unique=False)
subject     = models.CharField(verbose_name="Subject", max_length=100)

#authorship information
author          = models.ManyToManyField(Author, verbose_name="Book Author")
pages           = models.IntegerField(verbose_name="Number of Pages")
edition     = models.CharField(verbose_name="Edition", max_length=100, null=True, blank=True)
volumes     = models.CharField(verbose_name="Volume Number", max_length=100, null=True, blank=True)

#

现在，在前端，我想显示作者列表，以及他们制作的书籍。

像这样的东西：

JRR托尔金

• 指环王
• 霍比特人

Answer 1

您可以使用重组模板标签：https ://docs.djangoproject.com/en/dev/ref/templates/builtins/#regroup

在你看来：

books_qs = Book.objects.all()

books = []
for book in books_qs:
    for author in book.author.all():
        books.append({'title' : book.title, 'author' : author.lastname})

在您的模板中：

{% regroup books by author as author_list %}

<ul>
{% for author in author_list %}
   <li>{{ author.grouper}}
   <ul>
    {% for item in author.list %}
      <li>{{ item.title}}</li>
    {% endfor %}
</ul>
</li>
{% endfor %}