Django问题：Django管理表单数据丢失或已被篡改

Question

关于这个问题，我一直在考虑所有的问题，但似乎找不到解决办法

我试图允许用户提交多个对象，并使用带有2个foreignkey的表单集保存到数据库

我可以获取表单以将数据保存到数据库中，但由于ManagementForm错误，无法获取表单集中的表单以进行保存。问题不是我在HTML中没有它。（检查下面的HMTL代码。）我还为表单集设置了前缀

我不知道是否需要创建自定义表单和表单集，而不是使用模型。也许我需要更好地验证表单集中的信息

我得到的错误是：

/home/aking/signatureProject/signatureApp/views.py in signatures
        if formset.is_valid(): ...
Variable    Value
DD          <DDForm bound=True, valid=True, fields=(downdraft_id)>
PR          <PRForm bound=True, valid=True, fields=(report_id;report_desc)>
SignatureFormSet    <class 'django.forms.formsets.SigFormFormSet'>
formset <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>
request <WSGIRequest: POST '/signatureApp/signatures/'>
views.py

/usr/lib64/python2.7/site-packages/django/forms/formsets.py in is_valid
forms_valid True
self    <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>

/usr/lib64/python2.7/site-packages/django/forms/formsets.py in errors
self.full_clean() 
self <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>

/usr/lib64/python2.7/site-packages/django/forms/formsets.py in full_clean
for i in range(0, self.total_form_count()): 
empty_forms_count  0
self    <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>

/usr/lib64/python2.7/site-packages/django/forms/formsets.py in total_form_count
return min(self.management_form.cleaned_data[TOTAL_FORM_COUNT], self.absolute_max) 
self    <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>

/usr/lib64/python2.7/site-packages/django/utils/functional.py in __get__
res = instance.__dict__[self.name] = self.func(instance) 
cls <class 'django.forms.formsets.SigFormFormSet'>
instance    <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>
self    <django.utils.functional.cached_property object at 0x1b29dd0>

/usr/lib64/python2.7/site-packages/django/forms/formsets.py in management_form
 code='missing_management_form',
form <ManagementForm bound=True, valid=False, fields=(TOTAL_FORMS;INITIAL_FORMS;MIN_NUM_FORMS;MAX_NUM_FORMS)>
self <django.forms.formsets.SigFormFormSet object at 0x7f44601a4e10>

Views.py

from __future__ import unicode_literals
from django.shortcuts import render
from django.http import HttpResponse
from signatureApp.forms import DDForm,PRForm,SigForm
from django.forms.formsets import formset_factory

def signatures(request):
    SignatureFormSet = formset_factory(SigForm)
    if request.method == "POST":
        DD = DDForm(request.POST)
        PR = PRForm(request.POST)
        formset = SignatureFormSet(request.POST, prefix='SFS')
        if DD.is_valid() and PR.is_valid():
            DD.save()
            PR.save(commit=False)
            PR.draft_id = DD.cleaned_data['draft_id']
            PR.save()
            if formset.is_valid():
                for form in formset:
                    form.save(commit=False)
                    form.draft_id = DD.cleaned_data['draft_id']
                    form.report_id = PR.cleaned_data['report_id']
                    sig_type = form.cleaned_data.get('sig_type')
                    sig_desc = form.cleaned_data.get('sig_desc')
                    sig_rule = form.cleaned_data.get('sig_rule')
                    form.save(True)
    return render(request, 'reporting.html', {'DD':DDForm, 'PR':PRForm, 'SignatureFormSet':SignatureFormSet})

HTML

<form class='signatures' method='POST'>
    {% csrf_token %}
    {{ SignatureFormSet.management_form }}
        <div id='draft'>
            <h1>Enter Information from New Report Below</h1>
            <p><strong>ID:</strong><br>{{ DD.draft_id }}</p>
        </div>
        <div id='report'>
            <p><strong>Report Number:</strong><br>{{ PR.report_id }}</p>
            <p><strong>Report Description:</strong><br>{{ PR.report_desc }}</p>
        </div>
        {% for form in SignatureFormSet %}
        <div id='{{form.prefix}}' class='dynamic-form'>
            <p><strong>Signature Type:</strong><br>{{ form.sig_type }}</p>
            <p><strong>Signature Description:</strong><br>{{ form.sig_desc }}</p>
            <p><strong>Signature Rule:</strong><br>{{ form.sig_rule }}</p>
        {% endfor %}
        </div>
        <div class="btn-group">
            <button class="addSignature">Add a signature</button>
            <button id="submit-button">Submit</button>
        </div>
    </form>

forms.py

from django import forms
from signatureApp.models import draft_report, report, signatures

class DDForm(forms.ModelForm):
    class Meta:
        model = draft_report
        fields = ['draft_id',]

class PRForm(forms.ModelForm):
    class Meta:
        model = report
        exclude = ('draft_id',)

class SigForm(forms.ModelForm):
    class Meta:
        model = signatures
        exclude = ('draft_id','report_id',)

Answer 1

您需要实例化GET分支中的所有表单和表单集。在那里实例化表单集时，需要使用前缀

def signatures(request):
    SignatureFormSet = formset_factory(SigForm)
    if request.method == "POST":
        ...
    else:
        DD = DDForm()
        PR = PRForm()
        formset = SignatureFormSet(prefix='SFS')
    return render(request, 'reporting.html', {'DD': DD, 'PR': PR, 'SignatureFormSet': formset})