当我发布我的formset时，我得到一个MultiValueDictKeyError。特别：
MultiValueDictKeyError at /core/customers/1/update/documents/
"Key u'documents-0-attachment_ptr' not found in <QueryDict: {u'documents-1-last_modified_date': [u''], u'documents-1-name': [u''], u'documents-MAX_NUM_FORMS': [u''], u'documents-0-attachment_file': [u''], u'documents-INITIAL_FORMS': [u'1'], u'documents-1-document_type': [u''], u'documents-0-notes': [u''], u'documents-1-notes': [u''], u'submit': [u'Submit changes'], u'documents-0-DELETE': [u'on'], u'documents-1-attachment_file': [u''], u'documents-0-document_type': [u''], u'documents-TOTAL_FORMS': [u'2'], u'documents-0-name': [u'test'], u'documents-1-creation_date': [u''], u'documents-0-creation_date': [u'2012-12-01 23:41:48'], u'csrfmiddlewaretoken': [u'NCQ15jA7erX5dAbx20Scr3gWxgaTn3Iq', u'NCQ15jA7erX5dAbx20Scr3gWxgaTn3Iq', u'NCQ15jA7erX5dAbx20Scr3gWxgaTn3Iq'], u'documents-0-last_modified_date': [u'2012-12-01 23:41:48']}>"
关键部分是Django正在寻找帖子数据中的关键documents-0-attachment_ptr。这很令人困惑 - Document是附件的子类。所有其他发布数据都符合预期。为什么Django需要我的formset中的指针数据？
这是formset中使用的表单：
class DocumentInlineForm(forms.ModelForm): # pylint: disable=R0924
attachment_file = forms.FileField(widget=NoDirectoryClearableFileInput)
notes = forms.CharField(
required=False,
widget=forms.Textarea(attrs={'rows': 2,}),
)
helper = DocumentInlineFormHelper()
class Meta: # pylint: disable=W0232,R0903
fields = (
'attachment_file',
'creation_date',
'document_type',
'last_modified_date',
'name',
'notes',
)
model = Document
这是文档模型：
"""
Handles document model definitions.
"""
from django.db import models
from eee_core.models.attachments import Attachment
from django.db.models.signals import pre_save
from datetime import datetime
from django.utils.timezone import utc
class Document(Attachment):
"""
A document is an attachment with additional meta data.
"""
creation_date = models.DateTimeField(
blank=True,
null=True,
)
document_type = models.CharField(
blank=True,
choices=(
('CONTRACT', 'Contract'),
('INVOICE', 'Invoice'),
('FACILITY', 'Facility change form'),
('LOA', 'Letter of authorization'),
('USAGE', 'Usage history document'),
('OTHER', 'Other'),
),
default=None,
null=True,
max_length=8,
)
last_modified_date = models.DateTimeField(
blank=True,
null=True,
)
notes = models.TextField(
blank=True,
null=True,
)
class Meta(Attachment.Meta): # pylint: disable=W0232,R0903
"""
Sets meta fields for model.
"""
app_label = 'core'
def __str__(self):
return unicode(self).encode('utf-8')
def __unicode__(self):
return unicode(self.name)
def pre_save_callback(sender, instance, *args, **kwargs): # pylint: disable=W0613
if not isinstance(instance, Document):
return
if not instance.creation_date:
instance.creation_date = datetime.utcnow().replace(tzinfo=utc)
instance.last_modified_date = datetime.utcnow().replace(tzinfo=utc)
pre_save.connect(pre_save_callback, dispatch_uid='document_pre_save')
附加信息：
奇怪的是，formset的初始帖子工作得很好。它仅在更新帖子上 - 当formset中有初始表单时 - 当我收到此错误时。当我尝试从formset中删除表单时也会发生这种情况。
此外，formset是使用django crispy形式的通用内联formset。
更新
有人要求使用模板代码。这是简化版本：
{% load crispy_forms_tags %}
{% load url from future %}
<form action="" method="post" enctype="multipart/form-data">
{{ formset.management_form }}
{% for subform in formset.forms %}
{{ subform.id }}
{% crispy subform %}
{% endfor %}
<div class="btn-toolbar">
<input class='btn btn-primary' type="submit" name="submit" value="Submit changes" />
</div>
</form>
OP不是这种情况，但如果模板中缺少某些隐藏字段，您将遇到MultiValueDictKeyError。它可能发生在代替快速和脏的{{form}}，字段在模板中逐一列出：{{form.field1}}，{{form.field2}}，同时省略所需的隐藏字段。
要包含它们，请执行以下操作（对于formset中的每个表单/表单）：
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
要么
{% for form in formset %}
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
{% endfor %}
我也用
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
像这个
<div role="tabpanel" class="tab-pane active" id="email">
{% csrf_token %}
{{ eformset.management_form}}
<div class="panel panel-default">
<div class="panel-body">
<div id="addemail" class="btn btn-success">
<span class="glyphicon glyphicon-plus" >
</span>
</div>
<p><br></p>
{% for f in eformset %}
{% for hidden in f.hidden_fields %}
{{ hidden }}
{% endfor %}
<div class="item_email_set">
<table class="table table-condensed table-bordered">
<tr>
{% for field in f.visible_fields %} <!---->
<td>
{{ field.label }}
</td>
{% endfor %}
<td>
</td>
</tr>
<tr>
{% for field in f.visible_fields %}
<td>
{{field.errors.as_ul}}
{{field}}
</td>
{% endfor %}
<td class="btncolumn">
<p style="">
<a class="delete_email_set" href="#">
<div class="btn btn-danger">
<span class="glyphicon glyphicon-remove" >
</span>
</div>
</a>
</p>
</td>
</tr>
</table>
</div>
{% endfor %}
</div>
</div>
</div>
我解决了MultiValueDictKeyError
我通过将attachment_ptr添加到我的表单的字段列表中来停止此错误。所以DocumentInlineForm现在是：
class DocumentInlineForm(forms.ModelForm): # pylint: disable=R0924
attachment_file = forms.FileField(widget=NoDirectoryClearableFileInput)
notes = forms.CharField(
required=False,
widget=forms.Textarea(attrs={'rows': 2,}),
)
helper = DocumentInlineFormHelper()
class Meta: # pylint: disable=W0232,R0903
fields = (
'attachment_ptr',
'attachment_file',
'creation_date',
'document_type',
'last_modified_date',
'name',
'notes',
)
model = Document
也许这是我之前不知道的事情，但是Django是否要求你在所有使用子类模型的表单中提供指向超类的指针？这让我感到惊讶。
我想找出为什么这个指针字段是必需的，所以我在这里打开了一个问题来解决：Why does my django formset need a pointer field reference?。
这不是OP的答案，但我得到了同样的错误。我错误地从我的模板中删除了{{ subform.id }}，因为我无法直观地看到它并且我正在整理旧代码。在您的HTML中，您将获得以下内容：
<input name="note_set-0-id" value="34632" id="id_note_set-0-id" type="hidden">