python - ValueError：无法分配“1”：“Topic.board”必须是“Board”实例

Question

我知道有很多问题可以解决这个问题，但我还没有解决。请任何帮助我尝试了很多解决方案但没有奏效

模型.py

class Board(models.Model):
    name = models.CharField(max_length=50,unique=True)
    description = models.CharField(max_length=150)

    def __str__(self):     
        return self.name

class Topic(models.Model):
    subject = models.CharField(max_length=255)
    board = models.ForeignKey(Board,related_name='topics',on_delete=models.CASCADE)
    created_by = models.ForeignKey(User,related_name='topics',on_delete=models.CASCADE)
    created_dt = models.DateTimeField(auto_now_add=True)

class Post(models.Model):
    message = models.TextField(max_length=4000)
    topic = models.ForeignKey(Topic, related_name='posts',on_delete=models.CASCADE)
    created_by = models.ForeignKey(User,related_name='posts',on_delete=models.CASCADE)
    created_dt = models.DateTimeField(auto_now_add=True)

视图.py

def new_topic(request,board_id):
    board = get_object_or_404(Board,pk=board_id)
    if request.method == 'POST':
        subject = request.POST['subject']
        message = request.POST['message']
        user = User.objects.first()
    
        topic = Topic.objects.create(
            subject=subject,
            board=board_id,
            created_by=user
        )

        post = Post.objects.create(
            message=message,
            topic=topic,
            created_by=user
    )

new_topic.html

{% extends 'base.html' %}

{% block title %}Start a New Topic{% endblock %}

{% block breadcrumb %}
  <li class="breadcrumb-item"><a href="{% url 'home' %}">Boards</a></li>
  <li class="breadcrumb-item"><a href="{% url 'board_topics' board.pk %}">{{ board.name }}</a></li>
  <li class="breadcrumb-item active">New topic</li>
{% endblock %}

{% block content %}
  <form method="post">
    {% csrf_token %}
    <div class="form-group">
      <label for="id_subject">Subject</label>
      <input type="text" class="form-control" id="id_subject" name="subject">
    </div>
    <div class="form-group">
      <label for="id_message">Message</label>
      <textarea class="form-control" id="id_message" name="message" rows="5"></textarea>
    </div>
    <button type="submit" class="btn btn-success">Add</button>
  </form>
{% endblock %} 

我对 Django 很陌生。我将如何解决这个问题？

标签： pythondjango

Answer 1

在 new_topic(views.py) 中，将 board=board_id 转换为 board=board