尝试使用基于类的视图迭代 Django 中的模型，但得到错误 Project object is not iterable

如何解决尝试使用基于类的视图迭代 Django 中的模型，但得到错误 Project object is not iterable

我在models.py中使用了以下代码

class Project(models.Model):
    name = models.CharField(max_length=20,null=True)
    description = models.TextField(null=True)
    clientid = models.ForeignKey(Client,on_delete=models.CASCADE)
    
    def __str__(self):
        return self.name
        
    def get_absolute_url(self): # new
        return reverse('projectdetail',args=[str(self.id)])

这是views.py的代码

class ProjectDetailView(DetailView):
    model = Project
    template_name = 'projectdetail.html'
    fields='__all__'

这是我使用的模板

{% extends 'base.html' %}

{% block content %}
    
    {% if project %}
       There are {{ project|length }} records:
    {% for i in project %}
    <div class="project-entry">
        <h2>{{ i.id }}</h2>
        <p>{{ i.name }} </p>
        <p>{{ i.description }} </p>
        <p>{{ i.clientid }} </p>
   {% endfor %}
{% else %}
   There are no records in the system
{% endif %}
    </div>
    
{% endblock content %}

我收到错误

TypeError at /client/1/projectexisting
'Project' object is not iterable
Request Method: GET
Request URL:    http://02ccd1dfc89b4b71b62f894adef16c07.vfs.cloud9.us-east-2.amazonaws.com/client/1/projectexisting
Django Version: 2.1
Exception Type: TypeError
Exception Value:    
'Project' object is not iterable
Exception Location: /home/ec2-user/.local/lib/python3.7/site-packages/django/template/defaulttags.py in render,line 165
Python Executable:  /usr/bin/python3
Python Version: 3.7.10
Python Path:    
['/home/ec2-user/environment/cons_mgmt/cons_mgmt','/usr/lib64/python37.zip','/usr/lib64/python3.7','/usr/lib64/python3.7/lib-dynload','/home/ec2-user/.local/lib/python3.7/site-packages','/usr/local/lib64/python3.7/site-packages','/usr/local/lib/python3.7/site-packages','/usr/lib64/python3.7/site-packages','/usr/lib/python3.7/site-packages']
Server time:    Tue,20 Jul 2021 19:55:29 -0600
Error during template rendering
In template /home/ec2-user/environment/cons_mgmt/cons_mgmt/templates/base.html,error at line 6

'Project' object is not iterable

---

如果我取出 for 循环，我可以看到数据，但是我只能看到第一个条目，而第二个条目在另一个客户端页面中。

解决方法

我更愿意将上下文明确地发送到模板中，以便移动是透明的......像这样，

class ProjectDetailView(DetailView):
  model = Project
  template_name = 'projectdetail.html'

  def get_context_data(self,**kwargs):
    context = super(ProjectDetailView,self).get_context_data(**kwargs)
    context['project'] = Project.objects.all()    
    return context

现在您可以遍历项目对象...

,

保持你的models.py和模板html不变，用下面的代码替换views.py[不要忘记保持备份]，然后尝试执行。让我知道它是否适合您。

#views.py
from .models import Project
def ProjectDetailView(request):
    projectdetails = Project.objects.all()
    context = {
        'project': projectdetails
    }
    return render(request,'projectdetail.html',context)