CODEWITHSUNDEEP
pythondjangoforms
user2105143
user2105143

Reputation: 45

Django - Manipulating Data Posted from a form

I have a Django form all working fine, however I need to update one filed after the user has posted the form, I was thinking this should be done in the view? My code is below for the view definition in question.

def edit_change(request, change_id):
change = get_object_or_404(Change, id=int(change_id))
form = ChangeForm(request.POST or None, instance=change)
change_id = Change.objects.get(id=int(change_id))

context = dict(change=change, id=change_id,form=form)



if form.is_valid():
    if form['change_id'] = ""
        form.['change_id'] = "TEST_NUM"

    cmodel = form.save()


    cmodel.save()
    return redirect(changes)

return render_to_response('editchange.html',context,   context_instance=RequestContext(request))

Basically I want to see if the change_id has a value, if not add a value (date + (number of changes for that day + 1)), the continue to save the data.

Upvotes: 3

Views: 2319

Answers (3)

catherine
catherine

Reputation: 22808

def edit_change(request, change_id):

    ............

    if form.is_valid():
        change_id = form.cleaned_data['change_id']

        cmodel = form.save()

        if not change_id:
            cmodel.change_id = "TEST_NUM"
            cmodel.save()
        return redirect(changes)

    return render_to_response('editchange.html',context,   context_instance=RequestContext(request)

Upvotes: 3

Cole
Cole

Reputation: 2509

When you form.is_valid(), you create a form.data dict which form.save() then passes into the model associated with the form. If you add the in-between step of model_object = form.save(commit=False), you create a model instance, populated with all the form.data values. You can change and save this model instance as you need. E.g. model_object.change_id = "TEST_NUM". When you are done, you can finish with model_object.save(), never having need to use form.save()

More detail here: https://stackoverflow.com/questions/14982699/django-using-savecommit-false-to-add-user-id-to-a-form-dont-modify-save-or

Upvotes: 1

Emanuele Paolini
Emanuele Paolini

Reputation: 10162

I would redefine the clean method of the form, so that it makes the modification in the cleaned_data dict.

Upvotes: 0

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