从Heroku上的Rails应用程序运行npm软件包

Question

In my rails application I have a module that is running the following:

system("osmtogeojson #{input_path} > #{output_path}")

This works on my local machine as I have that specific npm package (osmtogeojson) installed. I have my application deployed on Heroku, and I cannot get Heroku to install NPM or my NPM Packages.

I follow the tutorial here and added a packages.json along with running

heroku config:add BUILDPACK_URL=https://github.com/ddollar/heroku-buildpack-multi.git

and creating a .buildpacks file with:

https://github.com/heroku/heroku-buildpack-nodejs
https://github.com/heroku/heroku-buildpack-ruby

When I deploy to Heroku, I don't see it running npm install with my dependencies, and my code that's calling the npm package does not work. What am I doing wrong here?

Answer 1

This article is a little outdated. You don't need anything like heroku-buildpack-multi anymore to configure multiple buildpacks. Besides, this project is deprecated. Remove it from your app and just add official buildpacks heroku/nodejs and heroku/ruby . It is usually a good idea to add nodejs first. Then try to re-deploy your application.

If it does not work, try to login into your application dyno with heroku run bash and verify that you actually have package.json. Check if it is not ignored somewhere, like in .gitignore or .slugignore .

If it still does not work, it is possible that you added required package as dev dependency. If so, set config variable NPM_CONFIG_PRODUCTION to false .

Hope this helps.

Answer 2

I thought I had done this in the first place, but for the record this is what worked.

• In my repo I ran and walked through the steps for $npm init
• Added the npm package I needed with $npm install osmtogeojson --save
• Added my buildpack to heroku $heroku config:add heroku/nodejs
• Pushed my repo up to heroku $git push heroku master

Now it works!