Question

I am trying to use Ruby with MySql and two more gems, composite_primary_keys and ActiveRecord, however, I am seeing version compatibility issues. Following are the details of the system and tools versions:

OS: CentOS 4.9
gcc: 3.4.6

mysql: mysql  Ver 14.7 Distrib 4.1.22, for redhat-linux-gnu (x86_64) using readline 4.3
ruby: ruby 1.9.3p0 (2011-10-30) [x86_64-linux]

Gems versions:

mysql: 2.8.1
composite_primary_keys: 4.1.1
activerecord: 3.1.3

Is there any documentation that shows a version compatibility chart or something for gems?

Answer 1

Gems has the gem dependency command, which shows what a particular gem expects:

gem depend mysql activerecord composite_primary_keys
Gem activerecord-3.1.3
  activemodel (= 3.1.3)
  activesupport (= 3.1.3)
  arel (~> 2.2.1)
  tzinfo (~> 0.3.29)

Gem composite_primary_keys-4.1.1
  activerecord (~> 3.1)

Gem mysql-2.8.1
  hoe (>= 2.3.3, development)
  rake-compiler (~> 0.5, development)

You can use gem dependency by itself to see all dependencies of all gems if you want to wade through the list.