Re: saving to two models from one class view

Hi Brad,

At the moment, two models do not have any relationship. I think you made an error in Line 3:

    created_by = models.ForeignKey(User, unique=True)

I think you meant "Applicant" instead of User.

Regards,

Arun

On Friday, January 10, 2014 3:13:42 AM UTC+5:30, Brad Rice wrote:

I have been banging around trying to write to two models from one view for a couple days and just cannot figure it out.

I am using a CreateView. I want to write to a model with just the created_by user and a default value of False in app_complete to. I'm getting this error:

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

Could anyone help me figure out how to save to two models from a class view?

Models I'm trying to save to:

class Application(models.Model):

    app_complete = models.BooleanField(default=False)

    created_by = models.ForeignKey(User, unique=True)

class Applicant(models.Model):

    first_name = models.CharField(max_length=100)

    last_name = models.CharField(max_length=100)

    title = models.CharField(max_length=100)

... more fields

My forms view:

class RegistrantForm(forms.ModelForm):

    ADDRESS_CHOICES = (('home', 'Home',), ('business', 'Business',))

    address_type = forms.ChoiceField(

        choices=ADDRESS_CHOICES, widget=forms.Select

    )

    street2 = forms.CharField(required=False)

    cell_phone = forms.CharField(required=False)

    fax_phone = forms.CharField(required=False)

    class Meta:

        model = Applicant

        fields = ('first_name', 'last_name', 'title', 'years_at_job', 'street1', 'street2', 'city', 'state', 'zip', 'address_type', 'residence', 'phone', 'cell_phone',

                  'fax_phone')

        exclude = ['created_by']   # Will be taken from the request

class ApplicationForm(forms.ModelForm):

    app_complete = forms.BooleanField(required=True, label="Check this to confirm the application is complete.")

    class Meta:

        model = Application

        fields = ('app_complete', 'created_by')

ApplicationFormSet = inlineformset_factory(Application, Applicant)

Then my view which doesn't work:

class RegistrantCreate(CreateView):

    model = Applicant

    form_class = RegistrantForm

    template_name = 'applicant_form.html'

    success_url = '/requestform/update2/'

@method_decorator(login_required)

    def dispatch(self, *args, **kwargs):

        return super(RegistrantCreate, self).dispatch(*args, **kwargs)

    def get(self, request, *args, **kwargs):

        """

        Handles GET requests and instantiates blank versions of the form

        and its inline formsets.

        """

        self.object = None

        form_class = self.get_form_class()

        form = self.get_form(form_class)

        application_form = ApplicationFormSet()

        return self.render_to_response(

            self.get_context_data(form=form,

                                  applicaton_form=application_form))

    def post(self, request, *args, **kwargs):

        """

        Handles POST requests, instantiating a form instance and its inline

        formsets with the passed POST variables and then checking them for

        validity.

        """

        self.object = None

        form_class = self.get_form_class()

        form = self.get_form(form_class)

        application_form = ApplicationFormSet(self.request.POST)

        if (form.is_valid() and application_form.is_valid() and

            application_form.is_valid()):

            return self.form_valid(form, application_form)

        else:

            return self.form_invalid(form, application_form)

    def form_valid(self, form, application_form):

        """

        Called if all forms are valid. Creates a Recipe instance along with

        associated Ingredients and Instructions and then redirects to a

        success page.

        """

        self.object = form.save(commit=False)

        self.object.created_by = self.request.user

        self.object = form.save()

        application_form.instance = self.object

        application_form.save(commit=False)

        application_form.instance.created_by = self.request.user

        application_form.save()

        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form, application_form):

        """

        Called if a form is invalid. Re-renders the context data with the

        data-filled forms and errors.

        """

        return self.render_to_response(

            self.get_context_data(form=form,

                                  application_form=application_form)

        )

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