attrs factory late evaluation support #38
Description
Hi,
Im using the lib with the attrs and i get this error
$ python3 test.py --user john
Traceback (most recent call last):
File "/tmp/test.py", line 31, in <module>
main()
File "/tmp/test.py", line 26, in main
args = parse(Args)
^^^^^^^^^^^
File "/tmp/.venv/lib/python3.11/site-packages/datargs/make.py", line 489, in parse
return cls(**result)
^^^^^^^^^^^^^
File "<attrs generated methods __main__.Args>", line 31, in __init__
File "/tmp/test.py", line 20, in is_mail_correct
raise ValueError(
ValueError: Email 'Factory(factory=<function Args._set_email_with_attrs at 0x7f60e72aafc0>, takes_self=True)' is not valid, expected something from ['default@example.com', 'john@example.com']
datargs disables evaluation of the attributes which are dependent on another ones
my program looks like this
from attrs import define, field
from datargs import parse
@define(auto_attribs=True, kw_only=True)
class Args:
user: str = field()
email: str = field()
@email.default
def _set_email_with_attrs(self) -> str:
return self.user + "@example.com"
@email.validator
def is_mail_correct(self, attribute, value):
valid_emails = [f"{u}@example.com" for u in ["default", self.user]]
if value not in valid_emails:
raise ValueError(
f"Email '{value}' is not valid, expected something from {valid_emails}"
)
def main():
args = parse(Args)
print(args)
if __name__ == "__main__":
main()and how class works without datargs, it sets attribute based on another one
>>> Args(user="john")
Args(user='john', email='john@example.com')
>>> Args(user="john", email="john@example.com")
Args(user='john', email='john@example.com')
>>> Args(user="john", email="idk@example.com")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<attrs generated methods test.Args>", line 31, in __init__
File "/tmp/test.py", line 20, in is_mail_correct
raise ValueError(
ValueError: Email 'idk@example.com' is not valid, expected something from ['default@example.com', 'john@example.com']