whenever i try to push in Heroku,i get this error ."Cargo, the Rust package manager, is not installed or is not on PATH." how to resolve?

Question

Preparing metadata (pyproject.toml): started remote: Preparing metadata (pyproject.toml): finished with status 'error' remote: error: subprocess-exited-with-error remote: remote: × Preparing metadata (pyproject.toml) did not run successfully. remote: │ exit code: 1 remote: ╰─> [6 lines of output] remote: Checking for Rust toolchain... remote: remote: Cargo, the Rust package manager, is not installed or is not on PATH. remote: This package requires Rust and Cargo to compile extensions. Install it through remote: the system's package manager or via https://rustup.rs/ remote: remote: [end of output] remote: remote: note: This error originates from a subprocess, and is likely not a problem with pip. remote: error: metadata-generation-failed remote: remote: × Encountered error while generating package metadata. remote: ╰─> See above for output. remote: remote: note: This is an issue with the package mentioned above, not pip. remote: hint: See above for details. remote: ! Push rejected, failed to compile Python app. remote: remote: ! Push failed

Answer 1

You're going to need to use multiple buildpacks, one for Rust and another for Python.

Rust is not officially supported, but several community options exist. Pick one, then configure your application:

1. Set your application to use the Python buildpack:

   heroku buildpacks:set heroku/python
   

2. Add your chosen Rust buildpack:

   heroku buildpacks:add --index 1 YOUR_CHOSEN_BUILDPACK
   

3. Run heroku buildpacks to ensure they are correct. You should see the Rust buildpack first, and the Python buildpack second.

4. Finally, redeploy your application.