Downgrade from 3.1.0 to 2.6.6

Because more plugins are supported for 2.6.6 version. I planed to downgrade my redmine from 3.1.0 to 2.6.6. But I found there's no related offical doc. Does anyone have related experience?

I tried to copy old redmine source replace the new version, but met some issues, such as:
ActiveRecord::StatementInvalid (PG::UndefinedColumn: ERROR: column issue_statuses.is_default does not exist
LINE 1: ... "issue_statuses".* FROM "issue_statuses" WHERE "issue_sta...
^
: SELECT "issue_statuses".* FROM "issue_statuses" WHERE "issue_statuses"."is_default" = 't' LIMIT 1):
app/models/issue_status.rb:41:in `default'
app/controllers/issues_controller.rb:445:in `check_for_default_issue_status'

It seems there's db changes between these two versions.

Replies (1)

RE: Downgrade from 3.1.0 to 2.6.6 - Added by Buzze Kr ies almost 10 years ago

Hi Ben,
from my experience, downgrading is always critical.
And for me only once worked from 3.0.1 back to 2.5...

My steps back then:

Remove all plugins. Acc. to removal instructions from plugin maintainer/Redmine.org
Have a second system setup (with 2.6.6)
Dump MySQL DB.
Copy directory FILES to new machine
Merge config settings (in /config/*.yml) files to new old system manually
Import DB in new old Redmine
Restart Webserver on new old machine
Try to get into Redmine
Reinstall Plugins. Plugin by Plugin

But I only managed to do so once.

And: No guarantee!

Generally, better use backups to re-activate an old system.

BR
A.

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