class Book(models.Model):
    author = models.CharField(max_length=100)
    title = models.CharField(max_length=100)
    languages = models.ManyToManyField(Languages, related_name='book_language')
    price = models.DecimalField(max_digits=5)

class BookForm(forms.ModelForm):
    multi_pricing = forms.CharField(widget=forms.HiddenInput())
    pricing_type = forms.CharField(widget=forms.HiddenInput())
    class Meta:
        model = Book
        fields = '__all__'