DJANGO - local variable 'form' referenced before assignment

Question

I\'m trying to make a form get information from the user and use this information to send a email. Here\'s my code:

#forms.py
from django import forms

class Con         


        

Answer 1

If there can be so to say - "collateral damage" by initializing an empty "form" , then you may also provide a "dummy" value as a filler , till the "request.POST" is initialized ...

def contato(request):
form = "Dummy String"
form_class = ContactForm
# if request is not post, initialize an empty form
#form = form_class(request.POST or None) # Maybe Not 
form = form_class(request.POST ) # Instead 
if request.method == 'POST':

    if form.is_valid():
        nome = request.POST.get('nome')
        email = request.POST.get('email')
        msg = request.POST.get('msg')

        send_mail('Subject here', msg, email, ['testmail@gmail.com'], fail_silently=False)
        return HttpResponseRedirect('blog/inicio')
return render(request, 'blog/inicio.html', {'form': form})

Answer 2

The only issue you have is you did not declare ContactForm as function, change FROM this;

def contato(request): form_class = ContactForm if request.method == 'POST':

TO; def contato(request): form_class = ContactForm() if request.method == 'POST':

Answer 3

You define the form variable in this if request.method == 'POST': block. If you access the view with a GET request form gets not defined. You should change the view to something like this:

def contato(request):
    form_class = ContactForm
    # if request is not post, initialize an empty form
    form = form_class(request.POST or None)
    if request.method == 'POST':

        if form.is_valid():
            nome = request.POST.get('nome')
            email = request.POST.get('email')
            msg = request.POST.get('msg')

            send_mail('Subject here', msg, email, ['testmail@gmail.com'], fail_silently=False)
            return HttpResponseRedirect('blog/inicio')
    return render(request, 'blog/inicio.html', {'form': form})

Answer 4

The Django docs handle this, but slightly differently from the other answers. See https://docs.djangoproject.com/en/dev/topics/forms/#using-a-form-in-a-view

Using an else, if the request is not POST then create the blank form. The below is pasted directly from the docs.

def get_name(request):
    # if this is a POST request we need to process the form data
    if request.method == 'POST':
        # create a form instance and populate it with data from the request:
        form = NameForm(request.POST)
        # check whether it's valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required
            # ...
            # redirect to a new URL:
            return HttpResponseRedirect('/thanks/')

    # if a GET (or any other method) we'll create a blank form
    else:
        form = NameForm()

    return render(request, 'name.html', {'form': form})