Google App Engine Django BooleanProperty未绑定到表

I have the following,

我有以下,

class Company(db.Model):
    companyvalid = db.BooleanProperty(required=True)

class AddCompanyForm(djangoforms.ModelForm):
    class Meta:
            model = Company
        exclude = ['companyentrytime']
        exclude = ['companylatlong']
class Company(