MultiValueDictKeyError on 'for' loop

I have Django site, which I am using to manage various projects and the information about each project.

I have models for Projects and Budgets in the database. Each Project can have many Budgets, but a Budget can only be associated with one Project.

I am trying to add the functionality to upload an image file to a Budget using a form on one of the webpages, but am getting an error whenever I try to upload the file...

The form in the template where I am trying to upload the file is:

<form method="POST" enctype="multipart/form-data" data-vat-status="{{project.vat_status}}" data-view-url="{% url 'projects:concept_save_ajax_2' project.id %}" class="autosave_form formset full-width" action="{% url 'projects:upload_budget_pdfs' project.id %}">

{% csrf_token %}

<div id="presentations" class="app-wrap center-apps middle">

{% with get|apps:'Budgets' as costing_app %}

{% for presentation in presentations %}

<div id="presentation-{{presentation.id}}" class="app sm {% if presentation.current_marker %}{{costing_app.color}}{% else %}{{app.color}}{% endif %}">

<a href="" class="filler"></a>

<a class="show-presentation bottom-right" name="presentation-{{presentation.id}}"><img class="icon" src="{% static 'img/edit-white.png' %}"></a>

<ul class="flush">

<li class=""><h2 class="p-t-lg">Presentation {{forloop.counter}}</h2></li>

<li>{{presentation.presentation_date|date:"d M y"|xor}}</li>

<li>{{presentation.details|xor|truncatechars:50}}</li>

{% if presentation.current_marker %}<li>({% if project.deposit_received%}Deposit{% else %}Current{% endif %} budget)</li>{% endif %}

</ul>

</div>

{% if forloop.last %}

{% endif %}

{% endfor %}

{# Add a new presentation #}

<div id="presentation-new" class="app sm {{costing_app.color}} outline">

<a id="new_presentation" data-view-url="{% url 'projects:save_new_presentation' project.id %}" class="filler show-presentation" name="presentation-new"></a>

<a name="presentation-new"></a>

<span class="big-head">+</span>

<h2 class="no-m">Add presentation</h2></li>

</div>

{% endwith %}

</div>

<div class="middle">

{{presentation_formset.management_form}}

{{drawing_formset.management_form}}

<div class="col-9 centered-block p-t-lg">

<table class="left fixed text-sm slim">

{# New presentation without budget #}

<tbody>

</tbody>

{# Edit presentation details #}

{% for presentation_form in presentation_formset %}

<tbody id="pres{{forloop.counter}}" class="presentation-form" name="presentation-{{presentation_form.instance.id|xor:'new'}}" style="display: none;">

{% if not forloop.last and presentation_form.instance.budget_items.count %}

<tr class="split-rows">

<td colspan="3">Exc VAT {% if not presentation_form.instance.current_marker %}{{presentation_form.instance.grand_total_exc_vat|money:'£'}}{% else %}{{project.budget_overview.updated_exc_vat|money:'£'}}{% endif %}</td>

<td colspan="3">Inc VAT {% if not presentation_form.instance.current_marker %}{{presentation_form.instance.grand_total_inc_vat|money:'£'}}{% else %}{{project.budget_overview.updated_inc_vat|money:'£'}}{% endif %}</td>

</tr>

{% endif %}

<tr>

{% for hidden in presentation_form.hidden_fields %}

<td class="hidden">{{ hidden }}</td>

{% endfor %}

</tr>

{% for field in presentation_form.visible_fields %}

<tr class="split-rows">

{% if not field.name == 'pdf_package_dep' %}

<td colspan="6"><label>{{field.label}}</label></td>

{% endif %}

</tr>

<tr class="split-rows">

<td colspan="6">

{% if not field.name == 'pdf_package_dep' %}

{% if field.name == 'presentation_date' %}

{% with presentation_form.instance.meeting as meeting %}

{% include "projects/includes/meeting_bit.html" with employee=request.user.employee meeting=meeting UID=presentation_form.instance.id %}

{% endwith %}

{# <a class="ical_trigger button" data-view-url="{% url 'events:add_to_cal' %}" {% if not field.value %}style="display:none"{% endif %}>Add to calendar</a> #}

{% else %}

{{field}}

{% endif %}

{% endif %}

</td>

</tr>

{% endfor %}

{% if presentation_form.instance.id %}

{# PDF uploads #}

{% with drawing_form=drawing_formset|getval:forloop.counter0  %}

{# budget_pdf_form=budget_pdf_formset|getval:forloop.counter0 #}

<tr>

{% if not forloop.last %}

<td colspan="3"><label>Budget PDF package</label></td>

{% endif %}

<td colspan="3"><label>Drawings</label></td>

</tr>

  

<tr>

{% if not forloop.last %}

<td colspan="3" class="center">

{% if presentation_form.instance.pdf_package_dep %}

<a class="button file-download pdf" href="{% url 'costing:pdf_open' presentation_form.instance.id %}?pdf=package_dep" target="_blank"></a><a class="pdf-clear" data-view-url="{% url 'costing:pdf_clear' presentation_form.instance.id %}?pdf=package_dep"><img class="icon m-l-sm m-b-md" src="{% static "img/bin.png" %}"></a>

{% else %}

{{presentation_form.pdf_package_dep}}

{% endif %}

</td>

{% endif %}

   {% for d_field in drawing_form.visible_fields %}

{% if drawing_form.instance.pdf %}

<td colspan="3" class="center">

<a class="button file-download pdf" href="{% url 'costing:pdf_open' presentation_form.instance.id %}?pdf=drawings" target="_blank"></a><a class="pdf-clear" data-view-url="{% url 'costing:pdf_clear' presentation_form.instance.id %}?pdf=drawings"><img class="icon m-l-sm m-b-md" src="{% static "img/bin.png" %}"></a>

</td>

{% else %}

<td colspan="3">{{d_field}}</td>

{% for d_hidden in drawing_form.hidden_fields %}

<td class="hidden">{{d_hidden}}</td>

{% endfor %}

{% endif %}

   {% endfor %}

   <tr>

    <td colspan="1" class="p-t-md"></td>

    <td colspan="4" class="p-t-md"><input type="submit" value="upload"></td>

    <td colspan="1" class="p-t-md"></td>

    </tr>

</tr>

{% endwith %}

{% endif %}

<tr>

<td colspan="3">

<a class="button email_trigger m-t-md" style="width:auto;" data-view-url="{% url 'comms:open_email_template' project.id %}?template=6&budget={{presentation_form.instance.id}}">Email client meeting report</a>

</td>

</tr>

<tr>

<td class="p-t-md">

<a {% if forloop.last %}id="refresh_presentations"{% endif %}class="update_presentation button fill">Done</a>

</td>

<td colspan="2">

{% if presentation_form.instance.id and not presentation_form.instance.budget_items.count %}

<a class="button fill" href="{% url 'costing:delete_presentation' presentation_form.instance.id %}">Delete</a>

{% endif %}

</td>

</tr>

</tbody>

{% endfor %}

</table>

</div>

</div>

</form>

and the view that is called when clicking the 'Submit' button on the form is:

def upload_budget_pdfs(request, project_id):

project = Project.objects.get(id=project_id)

print("Value of project in 'upload_budget_pdfs()': ", project)

if request.method == 'POST':

 

presentations = project.budget_versions.select_related('meeting').prefetch_related('budget_items', 'cci_items', 'presenters').filter(version_number__isnull=False).annotate(vn=F('version_number') * -1).order_by('presentation_date', 'created', '-vn')

print("Value of presentations in 'upload_budget_pdfs()': ", presentations)

drawing_formset = DrawingUploadFormset(request.POST, request.FILES, prefix="drawings", queryset=Drawing.objects.filter(budget__in=presentations).order_by('budget__presentation_date', 'budget__created'))

print("Value of drawing_formset in 'upload_budget_pdfs()': ", drawing_formset)

if drawing_formset:

print 'Saving drawing_formset'

print "Before", [b.id for b in project.budget_versions.all()]

for drawing_form in drawing_formset: # This line is what's causing the MultiValueDictKeyError

if drawing_form.instance.budget:

print 'Instance', drawing_form.instance.budget

drawing = drawing_form.save(commit=False)

drawing.budget = drawing_form.instance.budget

drawing.save()

print drawing, [b.id for b in project.budget_versions.all()]

else: 

print("Drawing formset not valid. ", drawing_formset.errors)

budget_formset = BudgetPresentationFormset(request.POST, request.FILES, instance=project, prefix="presentations")

if budget_formset.is_valid() and budget_formset.has_changed():

updated_budget_presentations = budget_formset.save()

elif budget_formset.has_changed(): print 'Budget formset not valid.',budget_formset.errors

return HttpResponseRedirect(reverse('projects:concept', args=[project_id]))

Currently, when I view this page in the browser, and the form is displayed, I can upload an image file to the form by clicking on the 'Upload' button, selecting the file, and pressing 'Ok'. I can see that the file has been 'attached' to the form correctly, as its name is displayed next to the 'Upload' button on the form.

However, when I then click the 'Submit' button, to submit the form, my browser displays an error page that says:

MultiValueDictKeyError at /projects/6215/upload-budget-pdf/

"u'drawings-4-id'"

Request Method:	POST
Request URL:	http://localhost:8000/projects/6215/upload-budget-pdf/
Django Version:	1.9.1
Exception Type:	MultiValueDictKeyError
Exception Value:	"u'drawings-4-id'"
Exception Location:	/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/utils/datastructures.py in __getitem__, line 85
Python Executable:	/Users/.../.virtualenvs/moon/bin/python
Python Version:	2.7.6
Python Path:	['/Users/.../Documents/Dev/moonhub/moon', '/Users/beckysmith/Documents/Dev/moonhub/moon/moon', '/usr/local/bin', '/Users/.../Documents/Dev/moonhub/moon', '/Users/.../.virtualenvs/moon/lib/python27.zip', '/Users/.../.virtualenvs/moon/lib/python2.7', '/Users/.../.virtualenvs/moon/lib/python2.7/plat-darwin', '/Users/.../.virtualenvs/moon/lib/python2.7/plat-mac', '/Users/.../.virtualenvs/moon/lib/python2.7/plat-mac/lib-scriptpackages', '/Users/.../.virtualenvs/moon/Extras/lib/python', '/Users/.../.virtualenvs/moon/lib/python2.7/lib-tk', '/Users/.../.virtualenvs/moon/lib/python2.7/lib-old', '/Users/.../.virtualenvs/moon/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/Users/elgan/.virtualenvs/moon/lib/python2.7/site-packages']
Server time:	Fri, 27 Jan 2017 08:48:54 +0000

and the console displays the following output:

("Value of project in 'upload_budget_pdfs()': ", <Project: Test 1>)

("Value of presentations in 'upload_budget_pdfs()': ", [<Budget: Test 1: Version -1>, <Budget: Test 1: Version -1>, <Budget: Test 1: Version 0>, <Budget: Test 1: Version 0>, <Budget: Test 1: Version 0>, <Budget: Test 1: Version 3>, <Budget: Test 1: Version 0>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, <Budget: Test 1: Version 1234>, '...(remaining elements truncated)...'])

("Value of drawing_formset in 'upload_budget_pdfs()': ", <django.forms.formsets.DrawingFormFormSet object at 0x107036110>)

Saving drawing_formset

Before [3690L, 3691L, 3693L, 3695L, 3696L, 3697L, 3707L, 3709L, 3726L, 3727L, 3745L, 3747L, 3748L, 3749L, 3750L, 3757L, 3763L, 3766L, 3769L, 3770L, 3771L, 3772L, 3801L, 3802L, 3866L, 3867L, 3868L, 3869L, 3870L, 3871L, 3872L, 3873L, 3874L, 3875L, 3876L, 3877L, 3878L, 3879L, 3880L, 3881L, 3882L, 3883L, 3884L, 3885L, 3886L, 3887L, 3888L, 3889L, 3890L, 3891L, 3892L, 3893L, 3894L, 3895L, 3896L, 3897L, 3898L, 3899L, 3900L]

Internal Server Error: /projects/6215/upload-budget-pdf/

Traceback (most recent call last):

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/core/handlers/base.py", line 140, in get_response

    response = middleware_method(request, callback, callback_args, callback_kwargs)

  File "/Users/.../Documents/Dev/moonhub/moon/moon/middleware.py", line 72, in process_view

    return permission_required(required_permission)(view_func)(request,*view_args,**view_kwargs)

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view

    return view_func(request, *args, **kwargs)

  File "/Users/.../Documents/Dev/moonhub/moon/projects/views.py", line 1034, in upload_budget_pdfs

    for drawing_form in drawing_formset: #ERF(24/01/2017 @ 1610) This line is what's causing the MultiValueDictKeyError

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/forms/formsets.py", line 74, in __iter__

    return iter(self.forms)

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/utils/functional.py", line 33, in __get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/forms/formsets.py", line 144, in forms

    for i in range(self.total_form_count())]

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/forms/models.py", line 587, in _construct_form

    pk = self.data[pk_key]

  File "/Users/.../.virtualenvs/moon/lib/python2.7/site-packages/django/utils/datastructures.py", line 85, in __getitem__

    raise MultiValueDictKeyError(repr(key))

MultiValueDictKeyError: "u'drawings-4-id'"

[27/Jan/2017 10:16:48] "POST /projects/6215/upload-budget-pdf/ HTTP/1.1" 500 205382

 

So it seems that the 'Internal Server Error' or 'MultiValueDictKeyError' is caused by the line: 

for drawing_form in drawing_formset:

but I don't understand why this is causing me the error...? Can anyone explain what I'm doing wrong here? Is there something wrong with the way I have declared `drawing_formset`? How can I resolve this error?

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