form.py

from django import forms

from .models import Product

class ProductForm(forms.ModelForm):
    title  = forms.CharField(label='Título')
    price =  forms.IntegerField(label='Preço')
    summary = forms.CharField(label='Resumo', widget=forms.Textarea(attrs={'cols':15, 'rows': 2}))
    class Meta:
        model = Product
        fields = [
            'title',
            'price',
            'summary'
        ]

    def clean_title(self, *args, **kwargs):
        title = self.cleaned_data.get('title')
        if 'CFE' in title:
            return title 
        else:
            raise forms.ValidationError('This is not valid')        


class RawProductForm(forms.Form):
    title  = forms.CharField(label='Título')
    price =  forms.IntegerField(label='Preço')
    summary = forms.CharField(label='Resumo', widget=forms.Textarea(attrs={'cols':15, 'rows': 2}))