Adding gems to a specific group

[ankitrg]

In a rails app I have multiple group like development, test, etc. I want to add the gem to a specific group. Is there a way to do this?

[pixelastic]

npm has npm install --save and npm install --save-dev; yarn has yarn add --dev.

I would also be interested in being able to run gemrat --group 'development' to add the gem to the correct group.