Is there a simple way to tell if a Gem will work in Rails3?

I wanted to use this gem:

https://github.com/PRX/apn_on_rails

Finally, after digging through the issues, seems it's not R开发者_运维百科ails3 ready (yet). Is there some simple way of finding is something is Rails 3 compatible without digging all over?

Thanks!

Aside from creating a fresh Rails app and giving it a try, I tend to look at the commit messages of forks created by other users (i.e. https://github.com/PRX/apn_on_rails/network). In this instance, it looks like there is a fork that runs on Rails 3 that is still being maintained.

Generally, if it isn't mentioned in the readme (on github) then no. Most gems I have used explicitly specify rails 2 and rails 3 install instructions. If this is not the case, then usually someone else will have asked this question and a quick search will reveal.

One other giveaway is the install instructions. The rails 2 way of installing a gem via a Gemfile is:

config.gem GEMNAME

The rails 3 way is:

gem 'apn_on_rails'

This answer is related to the gem you are looking for.