Poetry2nix flake build errors because the `poetry2nix.overrides` attribute seems to be missing

Describe the issue

I'm trying to build the following flake, which apart from the overrides section is verbatim from a templates from poetry2nix's repo

{
  description =  "bear";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
    poetry2nix = {
      url = "github:nix-community/poetry2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication;
      in
      {
        packages = {
          bear = mkPoetryApplication {
            packageName = "bearctl";
            projectDir = ./.;

            overrides = poetry2nix.overrides.withDefaults (self: super: {

              pycairo = super.pycairo.overridePythonAttrs (old: {
                nativeBuildInputs =
                  [ self.meson pkgs.buildPackages.pkg-config ];
              });
              pygobject = super.pygobject.overridePythonAttrs (old: {
                buildInputs = (old.buildInputs or [ ]) ++ [ super.setuptools ];
              });

              urllib3 = super.urllib3.overridePythonAttrs (old: {
                buildInputs = (old.buildInputs or [ ]) ++ [ self.hatch-vcs ];
              });

              pipewire-python = super.pipewire-python.overridePythonAttrs
                (old: {
                  buildInputs = (old.buildInputs or [ ]) ++ [ self.flit-core ];
                });

            });
            buildInputs =
              (with pkgs; [ pkgs.pipewire pkgs.lorri pkgs.xorg.xset pkgs.i3 ]);
          };
          default = self.packages.${system}.bear;
        };

        devShells.default = pkgs.mkShell {
          inputsFrom = [ self.packages.${system}.myapp ];
          packages = [ pkgs.poetry ];
        };
      });
}

which makes nix build balk with

✦ ❯ nix build .    
warning: Git tree '/home/robin/devel/bearctl' is dirty
error:
       … while evaluating the attribute 'packages.x86_64-linux.bear'

         at /nix/store/2xz05z3ar2i1fr06mzr434f6n59513g6-source/flake.nix:88:11:

           87|         packages = {
           88|           bear = mkPoetryApplication {
             |           ^
           89|             packageName = "bearctl";

       … while evaluating the attribute 'pkgs.buildPythonPackage'

         at /nix/store/yy19v2dwb8ldphvia9smajvwv3ycx2c1-source/pkgs/development/interpreters/python/passthrufun.nix:87:5:

           86|     withPackages = import ./with-packages.nix { inherit buildEnv pythonPackages;};
           87|     pkgs = pythonPackages;
             |     ^
           88|     interpreter = "${self}/bin/${executable}";

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: attribute 'overrides' missing

       at /nix/store/2xz05z3ar2i1fr06mzr434f6n59513g6-source/flake.nix:92:25:

           91|
           92|             overrides = poetry2nix.overrides.withDefaults (self: super: {
             |                         ^
           93|

I must be doing something very obvious incredibly wrong, but i can't seem to get this to work. What is happening?

thanks

With the new poetry2nix API you need to build poetry2nix (and not only mkPoetryApplication) from pkgs to access the overrides. This means that you should replace

inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication;

with

poetry2nix = inputs.poetry2nix.lib.mkPoetry2Nix { inherit pkgs;};

Below are the modifications made to your flake.nix to make it work:

{
  description =  "bear";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
    poetry2nix = {
      url = "github:nix-community/poetry2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs @ { self, nixpkgs, flake-utils, ...}:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        poetry2nix = inputs.poetry2nix.lib.mkPoetry2Nix { inherit pkgs; };
      in
      {
        packages = {
          bear = poetry2nix.mkPoetryApplication {
            packageName = "bearctl";
            projectDir = ./.;

            overrides = poetry2nix.overrides.withDefaults (self: super: {

              pycairo = super.pycairo.overridePythonAttrs (old: {
                nativeBuildInputs =
                  [ self.meson pkgs.buildPackages.pkg-config ];
              });
              pygobject = super.pygobject.overridePythonAttrs (old: {
                buildInputs = (old.buildInputs or [ ]) ++ [ super.setuptools ];
              });

              urllib3 = super.urllib3.overridePythonAttrs (old: {
                buildInputs = (old.buildInputs or [ ]) ++ [ self.hatch-vcs ];
              });

              pipewire-python = super.pipewire-python.overridePythonAttrs
                (old: {
                  buildInputs = (old.buildInputs or [ ]) ++ [ self.flit-core ];
                });

            });
            buildInputs =
              (with pkgs; [ pkgs.pipewire pkgs.lorri pkgs.xorg.xset pkgs.i3 ]);
          };
          default = self.packages.${system}.bear;
        };

        devShells.default = pkgs.mkShell {
          inputsFrom = [ self.packages.${system}.myapp ];
          packages = [ pkgs.poetry ];
        };
      });
}