class DecimalField
from django.forms import DecimalField
Ancestors (MRO)
- DecimalField
- IntegerField
- Field
Attributes
| Defined in | |
|---|---|
creation_counter = 0
|
Field |
default_error_messages = {'invalid': <django.utils.functional.lazy.<locals>.__proxy__ object at 0x10761fd68>}
|
DecimalField |
default_error_messages = {'invalid': <django.utils.functional.lazy.<locals>.__proxy__ object at 0x1075f8cc0>}
|
IntegerField |
default_error_messages = {'required': <django.utils.functional.lazy.<locals>.__proxy__ object at 0x1075f8c18>}
|
Field |
default_validators = []
|
Field |
empty_values = [None, '', [], (), {}]
|
Field |
re_decimal = re.compile('\\.0*\\s*$')
|
IntegerField |
Methods
def
bound_data(self, data, initial):
¶
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, value):
¶
Field
Validates the given value and returns its "cleaned" value as an
appropriate Python object.
Raises ValidationError for any errors.
def clean(self, value):
"""
Validates the given value and returns its "cleaned" value as an
appropriate Python object.
Raises 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):
¶
Field
Return True if data differs from initial.
def has_changed(self, initial, data):
"""
Return True if data differs from initial.
"""
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, value):
¶
DecimalField
Validates that the input is a decimal number. Returns a Decimal
instance. Returns None for empty values. Ensures that there are no more
than max_digits in the number, and no more than decimal_places digits
after the decimal point.
def to_python(self, value):
"""
Validates that the input is a decimal number. Returns a Decimal
instance. Returns None for empty values. Ensures that there are no more
than max_digits in the number, and no more than decimal_places digits
after the decimal point.
"""
if value in self.empty_values:
return None
if self.localize:
value = formats.sanitize_separators(value)
value = smart_text(value).strip()
try:
value = Decimal(value)
except DecimalException:
raise ValidationError(self.error_messages['invalid'], code='invalid')
return value
IntegerField
Validates that int() can be called on the input. Returns the result
of int(). Returns None for empty values.
def to_python(self, value):
"""
Validates that int() can be called on the input. Returns the result
of int(). Returns None for empty values.
"""
value = super(IntegerField, self).to_python(value)
if value in self.empty_values:
return None
if self.localize:
value = formats.sanitize_separators(value)
# Strip trailing decimal and zeros.
try:
value = int(self.re_decimal.sub('', force_text(value)))
except (ValueError, TypeError):
raise ValidationError(self.error_messages['invalid'], code='invalid')
return value
Field
def to_python(self, value):
return value
def
validate(self, value):
¶
DecimalField
def validate(self, value):
super(DecimalField, self).validate(value)
if value in self.empty_values:
return
# Check for NaN, Inf and -Inf values. We can't compare directly for NaN,
# since it is never equal to itself. However, NaN is the only value that
# isn't equal to itself, so we can use this to identify NaN
if value != value or value == Decimal("Inf") or value == Decimal("-Inf"):
raise ValidationError(self.error_messages['invalid'], code='invalid')
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):
¶
DecimalField
def widget_attrs(self, widget):
attrs = super(DecimalField, self).widget_attrs(widget)
if isinstance(widget, NumberInput) and 'step' not in widget.attrs:
if self.decimal_places is not None:
# Use exponential notation for small values since they might
# be parsed as 0 otherwise. ref #20765
step = str(Decimal('1') / 10 ** self.decimal_places).lower()
else:
step = 'any'
attrs.setdefault('step', step)
return attrs
IntegerField
def widget_attrs(self, widget):
attrs = super(IntegerField, self).widget_attrs(widget)
if isinstance(widget, NumberInput):
if self.min_value is not None:
attrs['min'] = self.min_value
if self.max_value is not None:
attrs['max'] = self.max_value
return attrs
Field
Given a Widget instance (*not* a Widget class), returns 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), returns a dictionary of
any HTML attributes that should be added to the Widget, based on this
Field.
"""
return {}