Default value is being ignored while structuring the attr class #14
Description
- cattrs version: 0.5.0
- Python version: 3.6.2
- Operating System: Debian GNU/Linux 8.9 (jessie)
Description
When I am trying use structure on an attr class having default values set for few optional attributes, those default values are being ignored and not returning to returned object
What I Did
Here is the sample code:
import attr
from cattr import structure, typed
from typing import Optional
@attr.s
class A(object):
a = typed(Optional[int], default=0)
@attr.s
class B(object):
b = attr.ib(validator=optional(instance_of(int)), default=0)
When I tried structure({}, A) I expected A1(a=0) but I get A1(a=None)
Similarly for structure({}, B) I get following error
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/xxx/cattr/converters.py", line 171, in structure
return self.structure_func.dispatch(cl)(obj, cl)
File "/xxx/cattr/converters.py", line 86, in <lambda>
lambda *args, **kwargs: self.structure_attrs(*args, **kwargs))
File "/xxx/cattr/converters.py", line 276, in structure_attrs_fromdict
converted = self._structure_attr_from_dict(a, name, obj)
File "/xxx/cattr/converters.py", line 286, in _structure_attr_from_dict
return mapping[name]
KeyError: 'b'
A fix something like will fix the issue: shwetas1205@7d6d6fa