我如何获取QuerySet的字段

Question

当我需要从post.title文本创建二维编码时，我在管理面板中添加帖子

我尝试使用django-qr代码库和ContactDetail模型，但出现错误：**之后的类型对象参数必须是映射，而不是Post

views.py     def索引（要求）：

# Use a ContactDetail instance to encapsulate the detail of the contact.
posts = Post.objects.all()
contact_detail = ContactDetail(
    first_name=Post.objects.get())    

# Use a WifiConfig instance to encapsulate the configuration of the connexion.

# Build context for rendering QR codes.
context = dict(
    posts=posts,
    contact_detail=contact_detail,

)

# Render the index page.
return render(request, 'blog/post_list.html', context=context)

models.py

class Post(models.Model):
author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
title = models.CharField(max_length=400)

html

{% qr_for_contact contact_detail=contact_detail size='S' %}