im not sure if i implement correctly the cleaning method in django

Question

I'm not sure if I'm implementing the clean and the  clean_<fieldname> methods correctly. In the documentation it says that we should call them, but where? we have to call them because at the moment of trying to go through form.is_valid() the data comes out as not validated and my question would be what I have to do heres my model:    

    class Users(models.Model):

         USERNAME_FIELD = models.CharField(max_length=90, blank=False, null=False, primary_key=True)

         LASTNAME_FIELD = models.CharField(max_length=90, null=False, blank=False)

         USERAGE_FIELD = models.IntegerField(null = True )

         USER_IMAGE_FIELD = models.ImageField(null = True, blank = False, upload_to='media/')

         USERMAIL_FIELD = models.EmailField()

         USERPSSWD_FIELD = models.CharField(max_length= 100)

         CONFPSSWD_FIELD = models.CharField(max_length=100)

         def clean(self):

            if (len(self.USERNAME_FIELD) = 0):

            raise ValidationError(_(not empty space'))

         

         def __str__(self):

             return self.USERNAME_FIELD

and heres my forms:

   

from django import forms

from .models import Users

from django.forms import ModelForm

from django.utils.translation import gettext_lazy as _

from django.forms import formset_factory

from django.core.exceptions import ValidationError

class Usersform(forms.ModelForm):

class Meta:

model = Users

fields = '__all__'

labels = {

'USERNAME_FIELD': _('Nombre del Usuario:'),

'LASTNAME_FIELD': _('Apellido del Usuario'),

'USERAGE_FIELD': _('Edad del Usuario:'),

'USER_IMAGE_FIELD': _('Foto del Usuario:'),

'USERMAIL_FIELD': _('Email del Usuario:'),

'USERPSSWD_FIELD': _('Contraseña:'),

'CONFPSSWD_FIELD': _('Confirma la Contraseña:'),

}

def clean_USERAGE_FIELD(self):

data = self.cleaned_data['USERAGE_FIELD']

if (data < 18):

raise ValidationError('you cant sign up youre to young')

return data

def clean_USERMAIL_FIELD(self):

data = self.cleaned_data['USERMAIL_FIELD']

if (len(data) == 0 ):

raise ValidationError('no empty spaces')

return data

def clean(self):

cleaned_data = super(Usersform, self).clean()

self.USERNAME_FIELD = cleaned_data.get("USERNAME_FIELD")

self.LASTNAME_FIELD = cleaned_data.get("LASTNAME_FIELD")

self.USER_IMAGE_FIELD = cleaned_data.get("USER_IMAGE_FIELD")

self.USERPSSWD_FIELD = cleaned_data.get("USERPSSWD_FIELD")

self.CONFPSSWD_FIELD = cleaned_data.get("CONFPSSWD_FIELD")

if (self.USERPSSWD_FIELD != self.CONFPSSWD_FIELD):

raise ValidationError("pass no coincide")

return cleaned_data

and heres my view :

class Sign_UpView(View):

template_name = "register.html"

form_class = Usersform

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

form = self.form_class()

return render(request, self.template_name, {'form':form})

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

form = self.form_class(request.POST)

print(request.POST)

if form.is_valid():

try:

form.clean()

HttpResponse('redirected')

except:

print("error")

return render(request, self.template_name, {'form':form})

please i need help