mysql2 - activerecord version compatibility list
In the course of doing upgrades for an older project I’ve discovered that not every activerecord version is compatible with every mysql2 version. The adapters use ~> to lock the gem version as a precaution. Functionally, everything seems fine.
Here’re the versions that work with each other
mysql2 |
activerecord |
| 0.5.x | =5.0.7, >=5.1.6 |
| 0.4.x | 4.2.5 - 5.0, >=5.0 |
| 0.3.x | 3.1, 3.2, 4.x, 5.0 |
| 0.2.x | 2.3 - 3.0 |
And the mysql2 adapter is here.
Unfortunately, I didn’t have the time to upgrade and test rails, so instead I had to edit that file directly.
If using rvm it’s located at ~/.rvm/gems/ruby-2.1.2@gemset/gems/activerecord-4.1.8/lib/active_record/connection_adapters and simply changing gem 'mysql2', '~> 0.3.13' to gem 'mysql2', '>= 0.3.13' worked.