Allow declarations in Faker kwargs

The problem

Take this model for example:

class User:
    address
    city
    state
    zip

A first approach to building a factory would look like this:

class User(Factory):
    address = Faker('street_address')
    city = Faker('city')
    state = Faker('state')
    zip = Faker('zipcode')

But this could cause spurious bugs since the zip and the state might not match. Instead, one might want to take this approach:

class User(Factory):
    address1 = Faker('street_address')
    city = Faker('city')
    state = Faker('state')
    zip = Faker('zipcode_in_state', state_abbr=SelfAttribute('state'))

However this fails with the following error:

/usr/local/lib/python3.6/dist-packages/faker/providers/address/en_US/__init__.py:427: in zipcode_in_state
    return self.postcode_in_state(state_abbr)

Exception: State Abbreviation not found in list

After doing some digging, it appears that the SelfAttribute is not being evaluated before being passed to Faker.

Proposed solution

Declarations should be evaluated before being passed to faker, the same way they are before being passed to subfactories.

[rbarrois]

Hi!

Thanks for the report!

This has been covered by #772, and should be available in release 3.1 😉

[maxrothman]

@interDist ah, I see what you mean. Looking at #732, it appears to describe a similar issue to this one. I appreciate the workaround, but would y’all be interested in the proposed fix?