Redmine

Patch merged in r2706 in 0.8-stable branch.

I am sorry but I checked out r2711 and the error still persists (but with slightly different line numbers) same in trunk:

% RAILS_ENV=production rake redmine:migrate_from_trac --trace
(in /var/www/rails_apps/redmine-0.8-stable)
** Invoke redmine:migrate_from_trac (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute redmine:migrate_from_trac

WARNING: a new project will be added to Redmine during this process.
Are you sure you want to continue ? [y/N] y

Trac directory []: /root/trac
Trac database adapter (sqlite, sqlite3, mysql, postgresql) [sqlite]: sqlite3
Trac database encoding [UTF-8]: 
Target project identifier []: myproject

Migrating components........
Migrating milestones....
Migrating custom fields....
Migrating tickets..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Migrating wiki.........................rake aborted!
undefined method `read' for nil:NilClass
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:146:in `read'
/var/www/rails_apps/redmine-0.8-stable/app/models/attachment.rb:76:in `before_save'
/var/www/rails_apps/redmine-0.8-stable/app/models/attachment.rb:74:in `open'
/var/www/rails_apps/redmine-0.8-stable/app/models/attachment.rb:74:in `before_save'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/callbacks.rb:301:in `send'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/callbacks.rb:301:in `callback'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/callbacks.rb:206:in `create_or_update'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/base.rb:2211:in `save_without_validation'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/validations.rb:911:in `save_without_dirty'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/dirty.rb:75:in `save_without_transactions'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:106:in `save'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/connection_adapters/abstract/database_statements.rb:66:in `transaction'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:79:in `transaction'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:98:in `transaction'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:106:in `save'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:118:in `rollback_active_record_state!'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/transactions.rb:106:in `save'
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:573:in `migrate'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_collection.rb:277:in `method_missing'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_proxy.rb:171:in `method_missing'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_proxy.rb:171:in `each'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_proxy.rb:171:in `send'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_proxy.rb:171:in `method_missing'
/var/lib/gems/1.8/gems/activerecord-2.1.2/lib/active_record/associations/association_collection.rb:277:in `method_missing'
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:565:in `migrate'
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:548:in `each'
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:548:in `migrate'
/var/www/rails_apps/redmine-0.8-stable/lib/tasks/migrate_from_trac.rake:756
/usr/lib/ruby/1.8/rake.rb:546:in `call'
/usr/lib/ruby/1.8/rake.rb:546:in `execute'
/usr/lib/ruby/1.8/rake.rb:541:in `each'
/usr/lib/ruby/1.8/rake.rb:541:in `execute'
/usr/lib/ruby/1.8/rake.rb:508:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/rake.rb:501:in `synchronize'
/usr/lib/ruby/1.8/rake.rb:501:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/rake.rb:494:in `invoke'
/usr/lib/ruby/1.8/rake.rb:1931:in `invoke_task'
/usr/lib/ruby/1.8/rake.rb:1909:in `top_level'
/usr/lib/ruby/1.8/rake.rb:1909:in `each'
/usr/lib/ruby/1.8/rake.rb:1909:in `top_level'
/usr/lib/ruby/1.8/rake.rb:1948:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:1903:in `top_level'
/usr/lib/ruby/1.8/rake.rb:1881:in `run'
/usr/lib/ruby/1.8/rake.rb:1948:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:1878:in `run'
/usr/bin/rake:28

I did a dropdb, createdb, db:migrate and redmine:load_default_data before migrating.
The environment is now:

About your application's environment
Ruby version              1.8.7 (i486-linux)
RubyGems version          1.3.1
Rails version             2.1.2
Active Record version     2.1.2
Action Pack version       2.1.2
Active Resource version   2.1.2
Action Mailer version     2.1.2
Active Support version    2.1.2
Application root          /var/www/rails_apps/redmine-0.8-stable
Environment               development
Database adapter          postgresql
Database schema version   101

I am using Redmine 0.8.3 r2717 and had the same problem when importing attachments to wiki pages. The following patch fixes the problem.

Patch committed in r2718 in trunk and r2719 in 0.8-stable.
Thanks.