Current migrate_from_trac rake task dose not work with 3.4.13, 4.0.7, 4.1.1.

There are many patches, but they have not been applied. and they are old (maybe they are for Redmine2.x or early 3.x)

• #14567
• #17898
• #18658
• #24570

I have merged these patches and available on Redmine 3.4.13. but not work with Redmine 4.x. because of the difference between Rails/ActiveRecord 4.2 and 5.2.

https://github.com/hkato/migrate_from_trac.rake/blob/master/migrate_from_trac-trac-1.0.patch

Anyway, could you merge this patch for trunk. and we will support Rails/ActiveRecord 5.2 issue after this.

Redmine 3.4.13

$ rake redmine:migrate_from_trac RAILS_ENV="production"
rake aborted!
NoMethodError: undefined method `set_inheritance_column' for TracMigrate::TracAttachment(Table doesn't exist):Class
Did you mean?  set_trace_func
/usr/local/bundle/gems/activerecord-4.2.11.1/lib/active_record/dynamic_matchers.rb:26:in `method_missing'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:121:in `'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:119:in `'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:25:in `block (2 levels) in '
/usr/local/bundle/gems/rake-13.0.1/exe/rake:27:in `'
Tasks: TOP => redmine:migrate_from_trac
(See full trace by running task with --trace)

Redmine 4.1.1

$ rake redmine:migrate_from_trac RAILS_ENV="production"
rake aborted!
NoMethodError: undefined method `set_inheritance_column' for TracMigrate::TracAttachment(Table doesn't exist):Class
Did you mean?  set_trace_func
/usr/local/bundle/gems/activerecord-5.2.4.2/lib/active_record/dynamic_matchers.rb:22:in `method_missing'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:121:in `'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:119:in `'
/usr/src/redmine/lib/tasks/migrate_from_trac.rake:25:in `block (2 levels) in '
/usr/local/bundle/gems/rake-13.0.1/exe/rake:27:in `'
Tasks: TOP => redmine:migrate_from_trac
(See full trace by running task with --trace)