python - django - 当 form.is_valid() 为 false 时如何返回包含所有数据的同一页面

Question

我是 django 的新手，我在提交错误后不显示所有数据的表单上苦苦挣扎了很长时间。在我预订健身类(class)的申请中，有一个标题，显示所选训练的数据，还有输入训练参与者数据的字段，还有一个提交按钮。当 form.is_valid() 为 false 时提交后，我想显示同一页面:所选训练的数据、输入到字段的数据以及所有错误填写的字段的验证信息。显示输入到字段和验证信息的数据有效，但显示所选培训的数据无效。我附上打印屏幕以显示这种情况。

截图:

views.py

class BookView(View):
    """
    Booking page - getting data of trainings and
    posting data of booking to db
    """
    template_name = 'club/book.html'
    form_class = BookingForm

    def post(self, request, training_id):
        form = self.form_class(request.POST)
        if form.is_valid():
            form.save()
            messages.success(request, 'Well done! Fitness Class has been booked for you. If you would like to cancel booked fitness class, please contact our office.')
            return HttpResponseRedirect('/book/' + training_id)
        else:
            messages.error(request, 'Oh snap! Fill/correct all fields and try submitting again.')
        return render(request, self.template_name, {'form': form})

    def get(self, request, training_id):
        training = get_object_or_404(Training,pk = training_id)
        form = self.form_class(instance=training)
        context = {'training': training,
                   'form': form}
        return render(request, self.template_name, context)

book.html

{% extends 'club/base.html' %}

{% block content %}
{% load bootstrap %}
<div>
    <h4>Please input your details to book the following Fitness Class</h4>
    <br></br>
    <div class="training-context">
        <label>{{training.name}} {{training.training_date}} {{training.start_time}}</label>
    </div>
</div>
<br></br>
<form action=" " method="POST">{% csrf_token %}
<div class="input-group">
{{form.first_name|bootstrap}}
<p></p>
{{form.last_name|bootstrap}}
<p></p>
{{form.email|bootstrap}}
<p></p>
{{form.phone|bootstrap}}
</div>
<input type="hidden" name="training" value={{training.id}}> 
<br></br>
<a href=""><button type="submit" class="btn btn-primary">Submit</button></a>
</form>
</div>

{% endblock %}

表单.py

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = '__all__'

模型.py

class Training(models.Model):
    """Class for plan training"""
    STATE = (
        ('A', 'Active'),
        ('I', 'Inactive'),
    )
    name = models.ForeignKey('TrnDesc')
    instructor = models.ForeignKey('Instructor')
    start_time = models.TimeField(blank=True)
    end_time = models.TimeField(default='00:00:00')
    availability = models.IntegerField(default=15)
    state = models.CharField(max_length=1, choices=STATE, default='A')
    training_date = models.DateField(default=date.today)
    def __str__(self):
        return self.name.name

class Booking(models.Model):
    """Data of people which book fitness classes"""
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    email = models.CharField(max_length=50)
    phone = models.CharField(max_length=10)
    training = models.ForeignKey('Training')
    def __str__(self):
        return self.training.name.name

urls.py

urlpatterns = [
    url(r'^$', HomePageView.as_view(), name='homepage'),
    url(r'^book/(?P<training_id>\d+)/$', BookView.as_view(), name='book'),
    ]

Answer 1

在您的 get 中，您在 post 中使用 context = { 'training': training, 'form': form } 进行渲染>，你只返回 { 'form' : form } 以防出错(当表单无效时)。

您应该以任何一种方式返回 training 对象，因为它始终显示:

if not form.is_valid():
    return render(request, self.template_name, { 'training': training, 'form': form })

除此之外，考虑使用 Django 的通用编辑 View ，例如 FormView 或 CreateView ( https://docs.djangoproject.com/en/1.9/ref/class-based-views/generic-editing/ )。