CODEWITHSUNDEEP
djangomodelformformset
wernerfeuer
wernerfeuer

Reputation: 575

Django: [u'ManagementForm data is missing or has been tampered with']

I have a modelformset that I want to save to a model.

In my templates, the following works perfectly (meaning that the form saves to the database when I hit submit):

{{ formset.management_form }}
{{ formset }}

Even this works great:

{{ formset.management_form }}
{% for row in formset %}
    {{ row }}
{% endfor %}

But as soon as I want to style my formset (in a table) like so:

{{ formset.management_form }}
{% for row in formset %}
    {{ row.field1 }}
    {{ row.field2 }}
    {{ row.field3 }}
{% endfor %}

I get [u'ManagementForm data is missing or has been tampered with'].

Fields 1 to 3 corresponds exactly to the model I want to save to. I really cannot figure this out!

My traceback shows this:

GET    No GET data
POST   Variable              Value
       form-0-field1         u'3'
       form-0-field2         u'3'
       form-0-field3         u'3'

Which are the same values I used in the first two examples (and which saved correctly).

Upvotes: 0

Views: 1858

Answers (2)

wernerfeuer
wernerfeuer

Reputation: 575

I finally found the answer (in the docs) that coincidently explains this matter exactly as I asked my question. The third option must render {{ row.id }}, otherwise Django will create the validation error. It is up to the user to use 'style="display: none;"' in the inline html, but it must be rendered.

Here's the link: https://docs.djangoproject.com/en/1.7/topics/forms/modelforms/#using-the-formset-in-the-template

Tested and it works!

Upvotes: 1

Railslide
Railslide

Reputation: 5554

Your rendering of the form doesn't include the additional data which are required for the ManagementForm (form-TOTAL_FORMS, form-INITIAL_FORMS and form-MAX_NUM_FORMS)

See: https://docs.djangoproject.com/en/1.7/topics/forms/formsets/#understanding-the-managementform

Upvotes: 1

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