Redmine Plugin development in Rails 3 versus Rails 4
I am updating my plugin from Redmine 0.8 to the current Redmine, and am wondering if there will be any issues porting it to Redmine on Rails 4.
There are a lot of great plugins from the 0.9 era, like Kanban, that could use a refresher as well.
I see a big problem, because the Observers are remove in changeset #12021.
So I got everywhere a "uninitialized constant JournalObserver (NameError)"
Soe other plugins have successfully moved away from Observers, so they now work on RedMine 2.4 eg: the redmine_helpdesk plugin: (http://www.redmine.org/plugins/redmine_helpdesk) -:
Migrated away from Observers to be compatible with 2.4.x