Use ApplicationRecord for Redmine 6 or later

[otegami]

Please look at this PR first https://github.com/haru/redmine_wiki_extensions/pull/39. After https://github.com/haru/redmine_wiki_extensions/pull/39, CI will be failed and then this PR will resolve it.

Issue

CI failed because of the following error.

/usr/local/bundle/gems/activerecord-7.1.2/lib/active_record/dynamic_matchers.rb:22:in `method_missing': undefined method `acts_as_event' for WikiExtensionsComment:Class (NoMethodError)

ref: https://github.com/otegami/redmine_wiki_extensions/actions/runs/8228360886/job/22497676680

Cause

Redmine::Acts::Event isn't included in ActiveRecord::Base anymore. That's the reason we cannot use Redmine::Acts::Event#acts_as_event.

Before Redmine v5.1, ActiveRecord::Base included Redmine::Acts::Event. And ActiveRecord::Base was a base class.

https://github.com/redmine/redmine/blob/ed7873a4c49d9209c597378dab9a982391093c32/lib/plugins/acts_as_event/init.rb#L4

After Redmine v6(master), ApplicationRecord includes Redmine::Acts::Event. And ApplicationRecord is a base class.

https://github.com/redmine/redmine/blob/fb449c77bc76b3bae9b3f0bfe18560b11f00902c/lib/plugins/acts_as_event/init.rb#L22

Solution

Change the base class from ActiveRecord::Base to ApplicationRecord.

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