Errors with factory_boy master: 'FactoryOptions' object has no attribute 'postgen_declarations'

There are errors with factory_boy master:

================================================ ERRORS ================================================
_______________________________ ERROR collecting tests/test_circular.py ________________________________
tests/test_circular.py:50: in <module>
    register(AuthorFactory)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:60: in register
    deps = get_deps(factory_class, model_name=model_name)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:154: in get_deps
    for attr, value in factory_class.declarations(factory_class._meta.postgen_declarations).items()
E   AttributeError: 'FactoryOptions' object has no attribute 'postgen_declarations'
___________________________ ERROR collecting tests/test_factory_fixtures.py ____________________________
tests/test_factory_fixtures.py:56: in <module>
    class AuthorFactory(factory.Factory):
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:60: in register
    deps = get_deps(factory_class, model_name=model_name)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:154: in get_deps
    for attr, value in factory_class.declarations(factory_class._meta.postgen_declarations).items()
E   AttributeError: 'FactoryOptions' object has no attribute 'postgen_declarations'
_____________________________ ERROR collecting tests/test_lazy_fixture.py ______________________________
tests/test_lazy_fixture.py:29: in <module>
    register(UserFactory)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:60: in register
    deps = get_deps(factory_class, model_name=model_name)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:154: in get_deps
    for attr, value in factory_class.declarations(factory_class._meta.postgen_declarations).items()
E   AttributeError: 'FactoryOptions' object has no attribute 'postgen_declarations'
_________________________ ERROR collecting tests/test_postgen_dependencies.py __________________________
tests/test_postgen_dependencies.py:23: in <module>
    class FooFactory(factory.Factory):
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:60: in register
    deps = get_deps(factory_class, model_name=model_name)
.tox/py36-pytest3/lib/python3.6/site-packages/pytest_factoryboy/fixture.py:154: in get_deps
    for attr, value in factory_class.declarations(factory_class._meta.postgen_declarations).items()
E   AttributeError: 'FactoryOptions' object has no attribute 'postgen_declarations'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 4 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
======================================= 4 error in 0.30 seconds ========================================
ERROR: InvocationError: '…/Vcs/pytest-factoryboy/.tox/py36-pytest3/bin/py.test --junitxml=…/Vcs/pytest-factoryboy/.tox/py36-pytest3/log/junit-py36-pytest3.xml pytest_factoryboy tests'
_______________________________________________ summary ________________________________________________
ERROR:   py36-pytest3: commands failed

Bisecting brings up the following commits (2 are skipped, since they cause a different error):

https://github.com/FactoryBoy/factory_boy/commit/c079d87ddb8e0eeabc66762d7f8f5bb81a143ff0 https://github.com/FactoryBoy/factory_boy/commit/e44766245e70fa102a7e1f85d3bd66c3646d271e https://github.com/FactoryBoy/factory_boy/commit/6f202077a5c8156fe96f8a028f883c14962f5b95

Likely related to the refactoring mentioned in https://github.com/pytest-dev/pytest-factoryboy/issues/23#issuecomment-316717930.

[subhashb]

Confirming that this has something to do with 2.9.0 (master) changes alone. I switched to FactoryBoy 2.8.1 and was able to avoid this issue for now.

[Matoking]

I decided to ditch pytest-factoryboy and simply write a function that injects the factories as fixtures as-is, per the example in https://github.com/pytest-dev/pytest/issues/2424

So, if your current conftest.py looks like this:

import factory
from pytest_factoryboy import register


class UserFactory(factory.DjangoModelFactory):
    class Meta:
        model = User

    username = factory.Sequence(lambda n: "TestUser%d" % n)


register(UserFactory)

try the following instead:

import factory
import pytest


class UserFactory(factory.DjangoModelFactory):
    class Meta:
        model = User

    username = factory.Sequence(lambda n: "TestUser%d" % n)


def register(factory_cls):
    def generate_fixture(cls):
        @pytest.fixture(scope="module")
        def created_fixture():
            return cls
        return created_fixture

    def to_snakecase(text):
        """
        Converts text from CamelCase to snake_case
        Source: https://stackoverflow.com/a/1176023/8981236
        """
        s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', text)
        return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()

    # Inject the fixture with snakecase name
    name = to_snakecase(factory_cls.__name__)

    globals()[name] = generate_fixture(factory_cls)


register(UserFactory)

My current test suite works with it without modifications, and I no longer need pytest-factoryboy as the dependency. Your mileage may vary, so this may not be enough for your needs.