如何通过单个查询在 Django 中获取所有相关对象的多关联字段记录

Question

class Author(models.Model):
    name = models.CharField(max_length=50)

class Chapter(models.Model):
    book = models.ForeignKey(Album, on_delete=models.CASCADE)
    author = models.ManyToManyField("Author")

class Book(models.Model):
    author = models.ManyToManyField("Author")

I can get Author.objects.get(id=1).chapter_set.all() and append each chapters author to the List but how can i achieve this by query in Django

Answer 1

you can follow this.

for fetching data in python you can use like this way.

fetch = Chapter.objects.all()

#and then for fetch the author
for chapter in fetch:
    author_fetch = chapter.author.all()
    #and now you can access the all data from author
    print(author_fetch[0].name)

and for showing data to html you don't need to call author_fetch. you can directly call it in html. Here is an example

{% for chapter in object_list %} 
  
  {% for author in chapter.author.all %} 
     {{author.name}} 
  {% endfor %}

{% endfor %}