django.forms.fields.NullBooleanField

class documentation

class NullBooleanField(BooleanField):

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A field whose valid values are None, True, and False. Clean invalid values to None.
Method to​_python No summary
Method validate Undocumented

Inherited from BooleanField:

Method has​_changed Return True if data differs from initial.

Inherited from Field (via BooleanField):

Method __deepcopy__ Undocumented
Method __init__ Undocumented
Method bound​_data Return the value that should be shown for this field on render of a bound form, given the submitted POST data for the field and the initial data, if any.
Method clean Validate the given value and return its "cleaned" value as an appropriate Python object. Raise ValidationError for any errors.
Method get​_bound​_field Return a BoundField instance that will be used when accessing the form field in a template.
Method prepare​_value Undocumented
Method run​_validators Undocumented
Method widget​_attrs Given a Widget instance (not a Widget class), return a dictionary of any HTML attributes that should be added to the Widget, based on this Field.
Class Variable default​_error​_messages Undocumented
Class Variable default​_validators Undocumented
Class Variable empty​_values Undocumented
Instance Variable disabled Undocumented
Instance Variable error​_messages Undocumented
Instance Variable help​_text Undocumented
Instance Variable initial Undocumented
Instance Variable label Undocumented
Instance Variable label​_suffix Undocumented
Instance Variable localize Undocumented
Instance Variable required Undocumented
Instance Variable show​_hidden​_initial Undocumented
Instance Variable validators Undocumented
Instance Variable widget Undocumented
def to_python(self, value):
overrides django.forms.fields.BooleanField.to_python
Explicitly check for the string 'True' and 'False', which is what a hidden field will submit for True and False, for 'true' and 'false', which are likely to be returned by JavaScript serializations of forms, and for '1' and '0', which is what a RadioField will submit. Unlike the Booleanfield, this field must check for True because it doesn't use the bool() function.
def validate(self, value):
overrides django.forms.fields.BooleanField.validate

Undocumented