Poetry2nix not using wheels even with `preferWheels = true`

[tfmoraes]

I create this github repository to show this problem: https://github.com/tfmoraes/poetry2nix_test

In this repository I used Niv to lock the Nixpkgs version (last in nixos-unstable) and Poetry2nix (also the last version). The project in this repository has two dependencies: numpy and cython. It uses poetry2nix.mkPoetryEnv to create a python environment with those two packages installed. I set it use wheels (preferWheels = true). But it's not using the wheels.

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/another-good-way-to-package-python-packages-from-pypi/14647/16

[tijolao]

this is happening to me too.

[imincik]

I confirm this issue as well. I am trying to avoid building numpy from source using following code, but it doesn't work

pkgs.poetry2nix.mkPoetryApplication {
    python = pkgs.python38;
    projectDir = builtins.path { path = ./.; name = "xyz"; };
    src = ./.;
    doCheck = false;
    overrides = 
        pkgs.poetry2nix.overrides.withDefaults (self: super: {

            # Use Python wheel to avoid lengthy compilation from source code
            numpy = super.numpy.override {
                preferWheel = true;
            };

        });

[imincik]

@adisbladis , I just found that test_preferwheel.py is empty file.

[imincik]

But setting global preferWheels = true works !

Example:

pkgs.poetry2nix.mkPoetryApplication {
    python = pkgs.python38;
    projectDir = builtins.path { path = ./.; name = "xyz"; };
    src = ./.;
    doCheck = false;
    preferWheels = true;  

[tfmoraes]

I tested here and preferWheels is working now.

[rossng]

Do you know if the issue with preferWheel was ever resolved? I have been able to use preferWheels but not preferWheel.