如何在django views.py中将一个类对象的id传递给另一个类对象

Question

这是一个图书馆管理web应用程序，我需要从一个BookIssue对象中根据它的id来过滤一个特定的图书对象，并在我点击issue按钮时将其设置为ISSUED。

其中Post模型包含图书的详细信息，BookIssue模型包含图书馆成员借阅图书的详细信息。当我单击html中的Issue时，它将转到BookIssueView类，在views.py中，我需要将Post模型的issued字段的值更改为True

请参阅views.py中的post = Post.objects.filter(id=self.request.GET.get('id')).update(issued=True)，我需要获取我根据其id选择的特定书籍。我如何实现它？

models.py

class Post(models.Model):
    title = models.CharField(max_length=100)
    book_author = models.CharField(default="",max_length=100)
    publisher = models.CharField(default="",max_length=100)
    content = models.TextField(max_length=200)
    date_posted = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    issued = models.BooleanField(default=False)
    issued_to = models.CharField(default="",max_length=100,null=False)
    issue_to_phone_number = models.CharField(default="",max_length=10)


    def __str__(self):
        return [self.title,self.id]

    def get_absolute_url(self):
        return reverse('post-detail', kwargs={'pk' : self.pk})


class BookIssue(models.Model):
    issue_name = models.CharField(max_length=100,null=False)
    issue_email = models.EmailField(max_length=254)
    issue_phone_number = models.CharField(default="",max_length=10)
    issue_address = models.TextField(max_length=300)
    issued_book = models.ManyToManyField(Post,default="")


    def __str__(self):
        return self.issue_name

    def get_absolute_url(self):
        return reverse('blog-home')

views.py

class BookIssueView(LoginRequiredMixin,CreateView,Post):
    model = BookIssue
    fields = ['issue_name','issue_email','issue_phone_number','issue_address']
    def form_valid(self, form):
        post = Post.objects.filter(id=self.request.GET.get('id')).update(issued=True)
        form.instance.author = self.request.user
        return super().form_valid(form)

模板

bookissue_form.html

{% extends "blog/base.html" %}
{% load crispy_forms_tags %}
{% block content %}
  <div class="content-section">

    <form method="post">
      {% csrf_token %}
      <fieldset class="form-group">
        <legend class="border-bottom mb-4">Issue Book</legend>
        {{ form|crispy }}
      </fieldset>
      <div class="form-group">
          <button class="btn btn-success" type="submit" name="button">Issue</button>
          <button class="btn btn-danger" type="submit" name="button">Cancel</button>
      </div>
    </form>
  </div>
{% endblock %}

urls.py

from django.urls import path
from . import views
from .views import (PostListView,
                    PostDetailView,
                    PostCreateView,
                    PostUpdateView,
                    PostDeleteView,
                    BookIssueView,
                    BookReturnView)

urlpatterns = [
    # path('',views.home, name='blog-home'),
    path('',PostListView.as_view(), name='blog-home'),
    path('post/<int:pk>/',PostDetailView.as_view(), name='post-detail'),
    path('post/new/',PostCreateView.as_view(), name='post-create'),
    path('post/<int:pk>/update/',PostUpdateView.as_view(), name='post-update'),
    path('post/<int:pk>/delete/',PostDeleteView.as_view(), name='post-delete'),
    path('post/<int:pk>/issue/',BookIssueView.as_view(), name='book-issue'),
    path('post/<int:pk>/return/',BookReturnView.as_view(), name='book-return'),
    path('about/',views.about, name='blog-about'),
]

Answer 1

id不在URL中，它在request.GET的pk kwarg中。

而且，您似乎没有做任何将帖子与BookIssue相关联的事情。

post = Post.objects.get(id=self.kwargs["pk"])
post.issued=True
post.save()
response = super().form_valid(form)
form.instance.issued_book.add(post)
return response