Humm, I'm getting:

```
bundle exec rake db:migrate   
==  ConvertToMultipleLegendStrings: migrating =================================
rake aborted!
An error has occurred, this and all later migrations canceled:

undefined method `each' for nil:NilClass/home/julius/gosrc/src/github.com/prometheus/promdash/db/migrate/20140507234559_convert_to_multiple_legend_strings.rb:6:in `block in up'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/relation/delegation.rb:13:in `each'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/relation/delegation.rb:13:in `each'
/home/julius/gosrc/src/github.com/prometheus/promdash/db/migrate/20140507234559_convert_to_multiple_legend_strings.rb:3:in `up'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:574:in `exec_migration'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:555:in `block (2 levels) in migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:554:in `block in migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:294:in `with_connection'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:553:in `migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:709:in `migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:959:in `block in execute_migration_in_transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:1005:in `block in ddl_transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `block in transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:210:in `within_new_transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/transactions.rb:209:in `transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:1005:in `ddl_transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:958:in `execute_migration_in_transaction'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:920:in `block in migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:916:in `each'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:916:in `migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:764:in `up'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/migration.rb:742:in `migrate'
/home/julius/.rvm/gems/ruby-2.0.0-p247@promdash/gems/activerecord-4.0.0/lib/active_record/railties/databases.rake:42:in `block (2 levels) in <top (required)>'
```

...but I don't know why, because `Dashboard.all` is not `nil` in the Rails console, and `each` works with it. Hummm...