I’ve gotten a Rails app from someone via heroku to modify. How can I tell, by examining the source code, what version of Rails was used to write the app?
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I’ve gotten a Rails app from someone via heroku to modify. How can I tell, by examining the source code, what version of Rails was used to write the app?
For Rails 3.x
It should be specified in the GEM file
For Rails 2.x – try the config/environment.rb
The file config/environment.rb may specify it e.g.
… but it is not required to.
You can take some educated guesses and try 2.3.2 or 2.3.11. Our own system uses a ton of gems and was pretty happy with 2.3.2 for at least a year.
Which Ruby Version?
A reasonable guess would be 1.8.7 as it has been around for so long. You could also try 1.9.2 but if the app has been around for more than a year, it is unlikely to be using 1.9.x – too many popular gems had problems with 1.9 until this last year or so.