class FileField

from django.forms import FileField

Ancestors (MRO)

  1. FileField
  2. Field

Descendants

Attributes

  Defined in
default_error_messages = {'invalid': 'No file was submitted. Check the encoding type on the form.', 'missing': 'No file was submitted.', 'empty': 'The submitted file is empty.', 'max_length': '', 'contradiction': 'Please either submit a file or check the clear checkbox, not both.'} FileField
default_error_messages = {'required': 'This field is required.'} Field
default_validators = [] Field
empty_values = [None, '', [], (), {}] Field
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Methods

def bound_data(self, data, initial):

FileField

    def bound_data(self, data, initial):
        if data in (None, FILE_INPUT_CONTRADICTION):
            return initial
        return data

Field

        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.

        For most fields, this will simply be data; FileFields need to handle it
        a bit differently.
        
    def bound_data(self, data, initial):
        """
        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.

        For most fields, this will simply be data; FileFields need to handle it
        a bit differently.
        """
        if self.disabled:
            return initial
        return data

def clean(self, data, initial=None):

FileField

    def clean(self, data, initial=None):
        # If the widget got contradictory inputs, we raise a validation error
        if data is FILE_INPUT_CONTRADICTION:
            raise ValidationError(self.error_messages['contradiction'], code='contradiction')
        # False means the field value should be cleared; further validation is
        # not needed.
        if data is False:
            if not self.required:
                return False
            # If the field is required, clearing is not possible (the widget
            # shouldn't return False data in that case anyway). False is not
            # in self.empty_value; if a False value makes it this far
            # it should be validated from here on out as None (so it will be
            # caught by the required check).
            data = None
        if not data and initial:
            return initial
        return super().clean(data)

Field

        Validate the given value and return its "cleaned" value as an
        appropriate Python object. Raise ValidationError for any errors.
        
    def clean(self, value):
        """
        Validate the given value and return its "cleaned" value as an
        appropriate Python object. Raise ValidationError for any errors.
        """
        value = self.to_python(value)
        self.validate(value)
        self.run_validators(value)
        return value

def get_bound_field(self, form, field_name): Field

        Return a BoundField instance that will be used when accessing the form
        field in a template.
        
    def get_bound_field(self, form, field_name):
        """
        Return a BoundField instance that will be used when accessing the form
        field in a template.
        """
        return BoundField(form, self, field_name)

def has_changed(self, initial, data):

FileField

    def has_changed(self, initial, data):
        return not self.disabled and data is not None

Field

Return True if data differs from initial.
    def has_changed(self, initial, data):
        """Return True if data differs from initial."""
        # Always return False if the field is disabled since self.bound_data
        # always uses the initial value in this case.
        if self.disabled:
            return False
        try:
            data = self.to_python(data)
            if hasattr(self, '_coerce'):
                return self._coerce(data) != self._coerce(initial)
        except ValidationError:
            return True
        # For purposes of seeing whether something has changed, None is
        # the same as an empty string, if the data or initial value we get
        # is None, replace it with ''.
        initial_value = initial if initial is not None else ''
        data_value = data if data is not None else ''
        return initial_value != data_value

def prepare_value(self, value): Field

    def prepare_value(self, value):
        return value

def run_validators(self, value): Field

    def run_validators(self, value):
        if value in self.empty_values:
            return
        errors = []
        for v in self.validators:
            try:
                v(value)
            except ValidationError as e:
                if hasattr(e, 'code') and e.code in self.error_messages:
                    e.message = self.error_messages[e.code]
                errors.extend(e.error_list)
        if errors:
            raise ValidationError(errors)

def to_python(self, data):

FileField

    def to_python(self, data):
        if data in self.empty_values:
            return None

        # UploadedFile objects should have name and size attributes.
        try:
            file_name = data.name
            file_size = data.size
        except AttributeError:
            raise ValidationError(self.error_messages['invalid'], code='invalid')

        if self.max_length is not None and len(file_name) > self.max_length:
            params = {'max': self.max_length, 'length': len(file_name)}
            raise ValidationError(self.error_messages['max_length'], code='max_length', params=params)
        if not file_name:
            raise ValidationError(self.error_messages['invalid'], code='invalid')
        if not self.allow_empty_file and not file_size:
            raise ValidationError(self.error_messages['empty'], code='empty')

        return data

Field

    def to_python(self, value):
        return value

def validate(self, value): Field

    def validate(self, value):
        if value in self.empty_values and self.required:
            raise ValidationError(self.error_messages['required'], code='required')

def widget_attrs(self, widget): Field

        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.
        
    def widget_attrs(self, widget):
        """
        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.
        """
        return {}