I know this is an older release of the dashboard but the only documents I can find are for 1.24 and higher.
The doc says the following but this does not work in dashboard 1.2.1, here is what I get when run, Any clarification would be appreciated.
rake node:del name=hostname --trace
(in /usr/share/puppet-dashboard)
DEPRECATION WARNING: Rake tasks in vendor/plugins/delayed_job/tasks are deprecated. Use lib/tasks instead. (called from /usr/share/puppet-dashboard/vendor/rails/railties/lib/tasks/rails.rb:10)
rake aborted!
Don't know how to build task 'node:del'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1727:in `[]'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2049:in `invoke_task'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2028:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2028:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2028:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2067:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2022:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2000:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2067:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1997:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19