Comments (1)
Only key:value
pairs for which value=None
are skipped. This is intentional. marshmallow does not make assumptions about whether a falsy value--such as an empty string--is a "null" value or if it is a valid, user-provided value. We would not, for example, want to skip 0
for a Number
field.
For now, you will have to explicitly set a String field's default to None
for it to be skipped.
A more long-term solution would be to allow Field
classes to define a set of null values that are skippable:
class String(Field):
# values that are skipped when skip_missing=True
NULL_VALUES = set([None, ''])
class List(Field):
# can't use a set, because lists are unhashable
NULL_VALUES = (None, [], tuple())
Thoughts?
from marshmallow.
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from marshmallow.