'NoneType' object has no attribute 'to_dependency'

[breitburg]

I tried to deploy my app that uses Poetry, but got an error:

-----> Patch Poetry export file
-----> Export requirements.txt from Poetry
  AttributeError
  'NoneType' object has no attribute 'to_dependency'
  at ~/.poetry/lib/poetry/packages/locker.py:234 in get_project_dependencies
      230│                     # project level dependencies take precedence
      231│                     continue
      232│ 
      233│                 # we make a copy to avoid any side-effects
    → 234│                 requirement = deepcopy(__get_locked_package(requirement).to_dependency())
      235│                 requirement._category = pkg.category
      236│ 
      237│                 if pinned_versions:
      238│                     requirement.set_constraint(
-----> Export Python version from Poetry to Heroku runtime.txt file
-----> Write 3.8.6 into runtime.txt
-----> App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz
       More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
 !     Push failed

My poetry.lock file:

[[package]]
category = "main"
description = "Fast and simple WSGI-framework for small web-applications."
name = "bottle"
optional = false
python-versions = "*"
version = "0.12.18"

[[package]]
category = "main"
description = "WSGI HTTP Server for UNIX"
name = "gunicorn"
optional = false
python-versions = ">=3.4"
version = "20.0.4"

[package.dependencies]
setuptools = ">=3.0"

[package.extras]
eventlet = ["eventlet (>=0.9.7)"]
gevent = ["gevent (>=0.13)"]
setproctitle = ["setproctitle"]
tornado = ["tornado (>=0.2)"]

[[package]]
category = "main"
description = "Python client for Redis key-value store"
name = "redis"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
version = "3.5.3"

[package.extras]
hiredis = ["hiredis (>=0.1.3)"]

[metadata]
content-hash = "184994068e190b2720ed44423cc8673e8300ceae582e90301adbe7502e598b42"
lock-version = "1.0"
python-versions = "3.8.6"

[metadata.files]
bottle = [
    {file = "bottle-0.12.18-py3-none-any.whl", hash = "sha256:43157254e88f32c6be16f8d9eb1f1d1472396a4e174ebd2bf62544854ecf37e7"},
    {file = "bottle-0.12.18.tar.gz", hash = "sha256:0819b74b145a7def225c0e83b16a4d5711fde751cd92bae467a69efce720f69e"},
]
gunicorn = [
    {file = "gunicorn-20.0.4-py2.py3-none-any.whl", hash = "sha256:cd4a810dd51bf497552cf3f863b575dabd73d6ad6a91075b65936b151cbf4f9c"},
    {file = "gunicorn-20.0.4.tar.gz", hash = "sha256:1904bb2b8a43658807108d59c3f3d56c2b6121a701161de0ddf9ad140073c626"},
]
redis = [
    {file = "redis-3.5.3-py2.py3-none-any.whl", hash = "sha256:432b788c4530cfe16d8d943a09d40ca6c16149727e4afe8c2c9d5580c59d9f24"},
    {file = "redis-3.5.3.tar.gz", hash = "sha256:0e7e0cfca8660dea8b7d5cd8c4f6c5e29e11f31158c0b0ae91a397f00e5a05a2"},
]

[zyv]

Caused by #13.

[zyv]

Well, this really sucks - our patch for poetry 1.1.2 brokenness apparently broke something that was working before - sorry about that. Could you please in the meantime just pin the poetry version to 1.1.1?

[zyv]

@marns93 could you please add an if-else here:

python-poetry-buildpack/bin/compile

Line 39 in 8ebc0c1

sed -i '234s/deepcopy(requirement)/deepcopy(__get_locked_package(requirement).to_dependency())/' $HOME/.poetry/lib/poetry/packages/locker.py

- deepcopy(__get_locked_package(requirement).to_dependency())
+ deepcopy(__get_locked_package(requirement).to_dependency()) if __get_locked_package(requirement) else deepcopy(requirement)

[marns93]

@breitburg Could you please try again? The fix should solve your problem.

[zyv]

@breitburg would be awesome if you could provide you pyproject.toml for regression tests as well.

[breitburg]

Yep! The issue was fixed! Thank you!

My pyproject.toml file:

[tool.poetry]
name = "bruh"
version = "0.1.0"
description = "Service that implements REST-ful API service"
authors = ["Ilya Breitburg <me@breitburg.com>"]

[tool.poetry.dependencies]
python = "3.8.6"
redis = "^3.5.3"
bottle = "^0.12.18"
gunicorn = "^20.0.4"

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"