Run multiple command lines in ruby

Question

I need to run multiple Ruby commands inside docker. What I normally do from SSH is:

docker exec -it containername bundle exec rails c

And then run my command. In this case:

SharedAccess.create(room_id: 56, user_id: 2)

The thing is I need to run multiple commands with different user_id's.

SharedAccess.create(room_id: 56, user_id: 3)
SharedAccess.create(room_id: 56, user_id: 4)
SharedAccess.create(room_id: 56, user_id: 5)

What I normally would do in shell is creating a script, pasting all the lines one below the other in there and then just run it. I want to find a way to create something like a script with all the lines in there and then run it from rake (inside docker).

you can just put the code lines you want to run inside a rake task, there doesn't need to be another script. — Les Nightingill
– Les Nightingill, Commented Aug 4, 2020 at 22:10
Ok that actually works! Thank you. And what about making it a script? — Fran Pereyra
– Fran Pereyra, Commented Aug 5, 2020 at 4:05
Definitely put it in a task and run like docker exec -it containername bundle exec rake migrate:shared_access . — Nick M
– Nick M, Commented Aug 5, 2020 at 7:26

spike 王建 · Accepted Answer · 2020-08-05 07:56:15Z

3

create a file somefile.rake in your lib/tasks directory:

namespace :migrate do
  desc "create some SharedAccess"
  task shared_access: :environment do
    SharedAccess.create(room_id: 56, user_id: 3)
    SharedAccess.create(room_id: 56, user_id: 4)
    SharedAccess.create(room_id: 56, user_id: 5)
  end
end

and now you can run docker exec containername bundle exec rake migrate:shared_access

edited Aug 5, 2020 at 7:56

answered Aug 5, 2020 at 4:36

spike 王建

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3 Comments

tadman Over a year ago

Rake tasks usually have a .rake extension even if they are just Ruby. This one should probably be called migrate.rake so it makes sense which task(s) it defines.

Fran Pereyra Over a year ago

Thank you @Spikie but I am very new into Ruby / Docker. How should I create the somefile.rake in lib/tasks inside Docker?

spike 王建 Over a year ago

There are a lot of ways to do this. 1.The simplest way is get a bash shell in container: docker exec -it containername sh and run vim lib/tasks/somefile.rb. 2.If your container is generated by Dockerfile.you can create somefile.rake in your project,and run docker build . in app root directory,and then somefile.rake should exist in your container.

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