Posts Tagged rvm

Free ad space if you donate to RVM

Hello People,

I am very much fond of rvm . All the apps I have deployed runs on it. RVM needs funding so that it can be developed further. I want to hasten the process of funding.

I have written a ruby programming book named ‘I Love Ruby’ thats totally free, you can get it here (this book will be released on jan 2014 or earlier)

If you donate $2000 to RVM I will grant full page advertisement, half page for $1000 and quarter page ad for $500. If you have donated these amounts you can contact me on mindaslab at gmail dot com so that I can put your ad in it.

The advertisement will stay till Jan 31 2014. It must be designed by you.

Please donate to RVM by going to


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rvm Gemsets

Lets say that you have two different Rails app. Now these apps would require certain types of gems, and some times these gem requirements could clash with each other. If that happens its better to use a thing called gem sets.

To know about gem sets take a look at this picture.


At the bottom you see the mighty rvm upon which can sit many Ruby installations, these installations can be switched using the rvm use <Ruby_version_number> , but lets say that you have two Ruby applications and for some strange reason you want to use one with older version of gems with one and another needs to use newer set of gems. You may want to  use different set of gems for an application, how to do that?

Well rvm has a thing called gemset with which you can group a set of gems under a name under a particular version of Ruby. This means as shown in the diagram above, note the green  boxes above Ruby 1.8 and 1.9 , you can have nnumber of gems ranginging from g1 to gn. You can name these gemsets any name you wish so that its quiet user friendly to change.

in the future if you think your Ruby / Rails / Sinatra or any other application is faltering due to  wrong gems installed, create a new gem set for it, switch it using rvm gemset commands and hope all things will go right. I am not going to dive deep into it as the rvm gemset has a good documentation here.

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