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PODjango ValidationError for custom model formset with custom fields (data is missing or has been tampered with)
 

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  1. PODjango ValidationError for custom model formset with custom fields (data is missing or has been tampered with)
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    <p>I'm working on a model formset for a Membership model (models auth.User membership to app.Project). Here's app/forms.py, after I trimming things I have confirmed to be irrelevant after commenting them out:</p> <pre><code>class EditMembership(forms.ModelForm): delete = forms.BooleanField(required=False, initial=False) class Meta: model = models.Membership fields = ('is_owner',) def clean_delete(self): return self.cleaned_data['delete'] class BaseEditMemberships(forms.models.BaseModelFormSet): # Some custom methods not dealing with validation. pass EditMembershipSet = forms.models.modelformset_factory(models.Membership, form=EditMembership, extra=0, formset=BaseEditMemberships) </code></pre> <p>Here is my template:</p> <pre><code>&lt;form method="{{ method|default:"post" }}" action="{{ action }}"&gt; {% csrf_token %} &lt;ul&gt; {% for form in formset %} &lt;li&gt;{{ form.instance.user}}&lt;/li&gt; {{ form.as_ul }} {% endfor %} &lt;/ul&gt; &lt;input type="submit" value="{{ submit_value|default:"Submit" }}" /&gt; &lt;/form&gt; </code></pre> <p>And my view:</p> <pre><code>@ownership_required(message="You must be an owner to edit memberships.") def edit_memberships(request, pk): project = get_object_or_404(models.Project, pk=pk) if request.method == "GET": formset = forms.EditMembershipSet( queryset=project.membership_set.all() ) return render_formset_fullpage(request, formset, "Edit Memberships", template=forms.EDITMEMBERSHIPS_PATH) elif request.method == "POST": formset = forms.EditMembershipSet(request.POST) return HttpResponse("Hooray!") </code></pre> <p>And the model in question:</p> <pre><code>class Membership(models.Model): class Meta: unique_together = ('project', 'user') project = models.ForeignKey('common.Project', editable=False) user = models.ForeignKey('auth.User') is_owner = models.BooleanField(default=False, blank=False, help_text="Indicates ownership of the project") project_alias = models.CharField(max_length=CHARFIELD_SHORT, help_text="User-given name", blank=True) </code></pre> <p>The problem is I keep getting a ValidationError back after doing the POST:</p> <pre><code>ValidationError at /project/4/memberships [u'ManagementForm data is missing or has been tampered with'] </code></pre> <p>From what I can tell, forms.EditMembership is doing OK. I can render that form and recreate it from the POST with no validation error, so I guess it is something wrong with the way I am using BaseEditMemberships/EditMembershipSet.</p> <p>EDIT:</p> <p>Just to give you even more information, here are an example form which is generated and the POST vars for one of my test requests. The form:</p> <pre><code>&lt;form method="post" action=""&gt; &lt;div style='display:none'&gt;&lt;input type='hidden' name='csrfmiddlewaretoken' value='d6d535efd35e83076e1ac14a82ef4cdc' /&gt;&lt;/div&gt; &lt;ul&gt; &lt;li&gt;someuser&lt;/li&gt; &lt;li&gt;&lt;label for="id_form-0-is_owner"&gt;Is owner:&lt;/label&gt; &lt;input checked="checked" type="checkbox" name="form-0-is_owner" id="id_form-0-is_owner" /&gt; &lt;/li&gt; &lt;li&gt;&lt;label for="id_form-0-delete"&gt;Delete:&lt;/label&gt; &lt;input type="checkbox" name="form-0-delete" id="id_form-0-delete" /&gt; &lt;input type="hidden" name="form-0-id" value="8" id="id_form-0-id" /&gt; &lt;/li&gt; &lt;/ul&gt; &lt;input type="submit" value="Submit" /&gt; &lt;/form&gt; </code></pre> <p>Corresponding POST vars if I check the delete box:</p> <ul> <li>form-0-id: u'8'</li> <li>csrfmiddlewaretoken: u'd6d535efd35e83076e1ac14a82ef4cdc'</li> <li>form-0-delete: u'on'</li> <li>form-0-is_owner: u'on'</li> </ul>
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