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Respect allow_null=True on DecimalFields (#7718)
* Handle None in to_representation() * Return None as '' in to_representation() when coerce_to_string=True * Handle '' as None in to_internal_value(), for symmetry with to_representation(), and because the empty concept doesn't make sense for Decimal.
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@ -1063,6 +1063,9 @@ class DecimalField(Field):
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try:
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value = decimal.Decimal(data)
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except decimal.DecimalException:
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if data == '' and self.allow_null:
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return None
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self.fail('invalid')
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if value.is_nan():
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@ -1112,6 +1115,12 @@ class DecimalField(Field):
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def to_representation(self, value):
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coerce_to_string = getattr(self, 'coerce_to_string', api_settings.COERCE_DECIMAL_TO_STRING)
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if value is None:
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if coerce_to_string:
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return ''
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else:
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return None
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if not isinstance(value, decimal.Decimal):
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value = decimal.Decimal(str(value).strip())
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@ -1090,6 +1090,9 @@ class TestDecimalField(FieldValues):
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'2E+1': Decimal('20'),
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}
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invalid_inputs = (
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(None, ["This field may not be null."]),
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('', ["A valid number is required."]),
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(' ', ["A valid number is required."]),
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('abc', ["A valid number is required."]),
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(Decimal('Nan'), ["A valid number is required."]),
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(Decimal('Snan'), ["A valid number is required."]),
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@ -1115,6 +1118,32 @@ class TestDecimalField(FieldValues):
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field = serializers.DecimalField(max_digits=3, decimal_places=1)
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class TestAllowNullDecimalField(FieldValues):
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valid_inputs = {
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None: None,
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'': None,
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' ': None,
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}
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invalid_inputs = {}
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outputs = {
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None: '',
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}
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field = serializers.DecimalField(max_digits=3, decimal_places=1, allow_null=True)
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class TestAllowNullNoStringCoercionDecimalField(FieldValues):
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valid_inputs = {
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None: None,
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'': None,
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' ': None,
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}
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invalid_inputs = {}
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outputs = {
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None: None,
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}
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field = serializers.DecimalField(max_digits=3, decimal_places=1, allow_null=True, coerce_to_string=False)
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class TestMinMaxDecimalField(FieldValues):
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"""
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Valid and invalid values for `DecimalField` with min and max limits.
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