Question

我创建了一个Django应用程序。在这种情况下，当我单击index.html页面上的更新按钮时，它必须重定向到一个显示具有3个字段（标题，用户，正文）的表单的网页。每次我单击更新时，该表单都不会生效。它总是返回false。实际上，如果我们按下更新按钮，则用户字段应显示当前用户的ID。但是它显示默认值。身体字段每次都变为空。

forms.py：

class ImmediateForm(forms.ModelForm):
title = forms.CharField(widget=forms.TextInput(attrs={'readonly': 'readonly'}),initial="Immediate",max_length=20)
class Meta:
    model = Immediate
    fields = ['title','user','body',]
    widgets = {
        'user': TextInput(attrs={'readonly': 'readonly'})
    }

Models.py：

class Immediate(models.Model):
title = models.CharField(default="Immediate",max_length=30)
user = models.ForeignKey(User, default=1,on_delete=models.CASCADE)
body = models.TextField(default="")

def __str__(self):
    return self.title

views.py：

def update_immediate(request,pk):
if not request.user.is_authenticated:
    return render(request, 'set_goals/index.html')
else:
    print(pk)
    try:
        if request.method=='POST' :
            print('Inside if')
        immediate = Immediate.objects.get(user_id=pk)
        form = ImmediateForm(request.POST or None, instance=immediate or None)
        if form.is_valid():
            print("no")
            immediate = form.save(commit=False)
            immediate.user = request.user.username
            immediate.body = form.cleaned_data['body']
            immediate.save()
            return render(request, 'set_goals/detail_immediate.html', {'immediate': immediate})
        context = {
            "form": form,
        }
        return render(request, 'set_goals/create_template.html', context)
    except:
        if request.method=='POST' :
            print('Inside if')
        form = ImmediateForm(request.POST or None)
        if form.is_valid():
            print("yes")
            immediate = form.save(commit=False)
            immediate.user = request.user
            immediate.body = form.cleaned_data['body']
            immediate.save()
            return render(request, 'set_goals/detail_immediate.html', {'immediate': immediate})
        context = {
            "form": form,
        }
        return render(request, 'set_goals/create_template.html', context)

按钮所在的html页面：

index.html：

    <div class="col-md-6">
          <div class="card mb-4">
              <div class="card-header">
    Immediate
  </div>
            <img class="card-img-top" style="width:495px;height:400px;" src="" alt="Card image cap">
            <div class="card-body">
              <h2 class="card-title">Empty for now</h2>
              <p class="card-text"></p>
                <form class="form-horizontal" role="form" action="" method="POST" enctype="multipart/form-data">
                <a href="{% url 'set_goals:update_immediate' user.id %}" class="btn btn-primary">Update &rarr;</a>
              <a href="{% url 'set_goals:detail_immediate' user.id %}" class="btn btn-primary">Read More &rarr;</a>
              </form>
                </div>

</div>
            </div>

这是什么错误？为什么InstantForm（）不起作用？该怎么做才能纠正这个问题？

Answer 1

要调试此问题，可以在form.is_valid之前或之后立即使用form.errors。然后只需输出到控制台，您就会发现问题所在。

Django form.is_valid（）每次都返回false

1 个答案: