I created my models with script/generate model DateQR
$ railroad -o models.dot -M ./app/models/yes_no_module.rb:14: warning: already initialized constant STRINGS_CONSIDERED_TRUE
./app/models/yes_no_module.rb:15: warning: already initialized constant DEFAULT_BOOLEAN_VALUES
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:249:in `load_missing_constant': Expected config/../app/models/date_qr.rb to define DateQr (LoadError)
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:452:in `const_missing'
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:464:in `const_missing'
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/inflector.rb:250:in `constantize'
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
from /usr/local/lib/ruby/gems/1.8/gems/railroad-0.3.4/lib/railroad/models_diagram.rb:24:in `generate'
from /usr/local/lib/ruby/gems/1.8/gems/railroad-0.3.4/lib/railroad/models_diagram.rb:23:in `generate'
from /usr/local/lib/ruby/gems/1.8/gems/railroad-0.3.4/bin/railroad:40
from /usr/local/bin/railroad:16
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