Django-管理员 : Editing child model without inlineForm

Question

标准示例:

class Author(models.Model):
  name = models.CharField(max_length=100)

class Book(models.Model):
  title = models.CharField(max_length=100)
  author = models.ForeignKey(Author)
  #... Many other fields ...

我想从作者更改页面编辑书籍。
我尝试过 InlineModelAdmin但由于 Book 字段较多，编辑起来并不容易。
这就是为什么我尝试在作者/更改模板上添加指向 child 的链接。

<ul>
  <li><a href="{% url admin:content_scribpart_add %}">Add a Book</a></li>
{% for book in original.book_set.all %}
  <li><a href="{% url admin:myapp_book_change book.id %}">Edit {{ book }}</a></li>
{% endfor %}
</ul>

但是有几个问题

• 如何在 Book 表单中预填充相关的作者 ID
• 如何使用“保存”按钮返回到相关的作者
• 我走在正确的道路上吗？

Answer 1

是的，当然。

1. 将 author 主键作为 GET 参数附加到您的网址:

   <ul>
     <li><a href="{% url admin:content_scribpart_add %}?author={{ object_id }}">Add a Book</a></li>
   {% for book in original.book_set.all %}
     <li><a href="{% url admin:myapp_book_change book.id %}?author={{ object_id }}">Edit {{ book }}</a></li>
   {% endfor %}
   </ul>
   

2. 修改图书对应的ModealAdmin，覆盖response_add() and response_change() 。请注意，我们还 override formfield_for_forein_key为了预先填充 author 字段:

   from django.http import HttpResponseRedirect
   from django.core.urlresolvers import reverse
   
   class BookAdmin(admin.ModelAdmin):
   
       def formfield_for_foreignkey(self, db_field, request, **kwargs):
           if db_field.name == "author":                    
               try:
                   author_pk = int(request.GET.get('author', ''),) 
               except ValueError:           
                   pass
               else:
                   kwargs["initial"] = Author.objects.get(pk=author_pk)
   
           return super(BookAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)
   
       def response_add(self, request, obj, post_url_continue=None):
           return HttpResponseRedirect(reverse('admin:myapp_author_change', args=(obj.author.pk,))
           )
   
       def response_change(self, request, obj, post_url_continue=None):
           return HttpResponseRedirect(reverse('admin:myapp_author_change', args=(obj.author.pk,))
           )