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python - Django 绑定表单无效但未引发 ValidationError

问题描述

我的 Django 表单有问题。当我单击表单中的提交按钮时，没有数据保存到数据库中。我发现数据是绑定的，但它没有通过form.is_valid()函数。下面分别是forms.py、views.py和urls.py的代码new-event.html：
forms.py 

from django import forms
class EventForm(forms.Form):
    name = forms.CharField(label='event-name',
                           max_length=50,
                           widget=forms.TextInput(attrs={'class': 'form-control', 'id': 'event-name', 'name': 'event-name'}))

    start_datetime = forms.DateTimeField(
    widget=forms.DateTimeInput(attrs={'class': 'form-control', 'id': 'start-datetime', 'name': 'start-datetime', 'type': 'datetime-local'}))

    end_datetime = forms.DateTimeField(
    widget=forms.DateTimeInput(attrs={'class': 'form-control', 'id': 'end-datetime', 'name': 'end-datetime', 'type': 'datetime-local'}))

    event_category = forms.ChoiceField(widget=forms.Select(attrs={'class': 'custom-select', 'id': 'event-type'}),
    choices=((None, 'Please select an option'), ('Daily Life', 'Daily Life'), ('Study', 'Study'), ('Social', 'Social'), ('Work', 'Work')))

    description = forms.CharField(max_length=250, widget=forms.Textarea(attrs={'class': 'form-control', 'id': 'description', 'name': 'description'}), required=False)

views.py 

from django.shortcuts import render, redirect
from .models import Entry
from .forms import EventForm
from django.views.decorators.http import require_POST

# request is required that represents HttpResponse
# return value can be response, JSON or template

def index(request):
    entries = Entry.objects.order_by('-date_added')
    context = {'entries': entries}
    return render(request, 'event/list-events.html', context)

def new_event(request):
    form = EventForm()
    context = {'form': form}
    return render(request, 'event/new-event.html', context)

@require_POST
def add_event(request):

    if request.method == 'POST':

        form = EventForm(request.POST)

        if form.is_bound: print('form is bound')
        else: print('form is unbound')

        if form.is_valid():
            print('form is valid')
            new_entry = Entry(name=form.cleaned_data['name'], start_datetime=form.cleaned_data['start_datetime'],
                              end_datetime=form.cleaned_data['end_datetime'], category=form.cleaned_data['event_category'],
                              description=form.cleaned_data['description'])
            new_entry.save()

        else:
            print('form is invalid')
            return render(request, 'event/new-event.html', {'form': form})

        return redirect('index')

    # else:
    #     form = EventForm()

urls.py 

from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'),
    path('new-event/', views.new_event, name='new_event'),
    path('add-event/', views.add_event, name='add_event')
]

new-event.html

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

{% block title %}New Entry{% endblock %}

{% block content %}
    <form action="{% url 'add_event' %}" method="POST" class="container-fluid">
        {% csrf_token %}
        <div class="form-group row">
            <label for="event-name" class="col-sm-2 col-form-label">Event</label>
            <div class="col-sm-10">
                {{ form.name }}
            </div>
        </div>
        <div class="form-group row">
            <label for="event-type" class="col-sm-2 col-form-label">Event type</label>
            <div class="col-sm-10">
                {{ form.event_category }}
            </div>
        </div>
        <div class="form-group row">
            <label for="start-datetime" class="col-sm-2 col-form-label">Start Time</label>
            <div class="col-sm-10">
                {{ form.start_datetime }}
            </div>
        </div>
        <div class="form-group row">
            <label for="end-datetime" class="col-sm-2 col-form-label">End Time</label>
            <div class="col-sm-10">
                {{ form.end_datetime }}
            </div>
        </div>

        <div class="form-group">
            {{ form.description }}
        </div>
        <input type="submit" name="submit" value="Submit" class="btn btn-primary">
    </form>
{% endblock %}

我的终端上的输出是：form is bound form is invalid......我确信我不会陷入bound和instance之间的概念混淆。谁能给我一些关于这是如何发生的提示？

标签： pythondjangoformsvalidation

解决方案

我不确定你为什么认为这是一个问题。您的表单已正确绑定到 POST 数据；然后，该数据被验证，发现没有通过验证。

要查看原因 - 并允许用户更正问题 - 您应该{{ form.errors }}在模板上输出，或为每个字段使用单独的错误属性，例如{{ form.name.errors }}等。

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