Error reading yaml file using poyo - ValueError: Parent of ChildMixin instance needs to be a Container.

[acturner]

• Cookiecutter version: 1.7.2
• Template project url: https://github.com/acturner/cookiecutter-value-error
• Python version: 3.8.9
• Operating System: macOS

Description:

When using a nested configuration which includes a list (see the list of authors in example template), we obtain an error from poyo simply trying to read the yaml file:

ValueError: Parent of ChildMixin instance needs to be a Container.

What I've run:

1. git clone https://github.com/acturner/cookiecutter-value-error
2. cookiecutter cookiecutter-value-error --config-file=cookiecutter-value-error/init.yaml --no-input

[simobasso]

Hey @acturner, thanks for spotted out. Can you please check #1516 if fix your issue?

[acturner]

@simobasso #1516 does not fix this issue, unfortunately. The error comes from poyo and I don't know why (drop-in replacement of pyyaml for poyo here fixes the problem but I know we can't use pyyaml).

[simobasso]

Hey, @acturner, thanks for the follow-up.

Yes, #1516 doesn't fix this issue.

It seems we have a lot of duplicated issue of the same bug; I'll try to link all of this issue to track better how to solve the issue at the root.

refs: #1232

[glumia]

I looked into it, it's a problem with poyo not being able to correctly parse the list of authors dictionaries in the yaml file. There's even an open issue for that (hackebrot/poyo#12) dating back to 2016.

+1 for switching to PyYAML, as @samj1912 said in #1515 (comment) they now provide pre-compiled binaries for windows so cross-platform compatibility shouldn't be a problem anymore.

[glumia]

Fixed with #1489.