cabal file not found in dependency override

[peterbecich]

I'm attempting to override the Hackage package attoparsec-aeson:
https://hackage.haskell.org/package/attoparsec-aeson
https://github.com/haskell/aeson/tree/master/attoparsec-aeson

It is not available in NixPkgs: NixOS/nixpkgs#247406

Tried two ways:
1 . attoparsec-aeson.source = "2.2.0.0"; results in:

       > tar: */attoparsec-aeson/2.2.0.0/attoparsec-aeson.json: 
       > tar: */attoparsec-aeson/2.2.0.0/attoparsec-aeson.cabal:

Howover, the .cabal file is definitely in the archive, here it is in the tar.gz downloaded from Hackage:

$ ls
LICENSE  attoparsec-aeson.cabal  src

Manual Flake input. (attoparsec-aeson lives in subdirectory of GitHub repo haskell/aeson.)

    attoparsec-aeson = {
      url = "github:haskell/aeson/274b562695863dc4a1b2e9a8c9d174c2b78cdd12?dir=attoparsec-aeson";
      flake = false;
    };

and

attoparsec-aeson = inputs.attoparsec-aeson;

results in:

error: The option `lastModified' does not exist. Definition values:

Thanks for any help

Flake:
https://github.com/peterbecich/hackage-server/blob/update-flake/flake.nix

[srid]

For (1) you can try updating nixpkgs. For (2), it should be attoparsec-aeson.source = inputs.attoparsec-aeson(note the .source).

[peterbecich]

Thanks, great catch, I was missing source