undefined method `last' for {}:Hash rake db:migrate

rubyonrails-talk
1

I have tried everything I can think of to make this work for 3 days. Thanks in advance.

Here is what I did: rails _1.2.5_ little_ones_bend svn export http://svn.subimage.com/source/substruct/site/trunk/vendor/plugins vendor/plugins --username substruct --password substruct

svn export http://dev.rubyonrails.org/svn/rails/tags/rel_1-2-5 vendor/ rails followed instructions from http://dev.subimage.com/projects/substruct/wiki/InstallingSubstruct ruby script/generate plugin_migration rake db:migrate

As near as I can tell, the engine plugin is sending a Hash to the function named "redefine_task" which calls "resolve_args" and dies because Hash has no .last method C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1653:in `resolve_args'

here it is. error on line 1653     def resolve_args(args)       task_name = args.shift       arg_names = args #.map { |a| a.to_sym }       needs =       if task_name.is_a?(Hash)         hash = task_name         task_name = hash.keys[0]         needs = hash[task_name]       end       if arg_names.last.is_a?(Hash) # line 1653 error here         hash = arg_names.pop         needs = hash[:needs]         fail "Unrecognized keys in task hash: #{hash.keys.inspect}" if hash.size > 1       end       needs = [needs] unless needs.respond_to?(:to_ary)       [task_name, arg_names, needs]     end

Here is the engine code that is calling redefine_task       Rake::Task.redefine_task(plugin => :environment) do         plugin_base = RAILS_ROOT + "/vendor/plugins/#{plugin}"         options =         files = Rake::FileList.new         options << "-o doc/plugins/#{plugin}"         options << "--title '#{plugin.titlecase} Plugin Documentation'"         options << '--line-numbers' << '--inline-source'         options << '-T html'

C:\rails_projects\little_ones_bend>rake db:migrate --trace (in C:/rails_projects/little_ones_bend) rake aborted! undefined method `last' for {}:Hash C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1653:in `resolve_args' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:9:in `redefine_task' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:24:in `redefine_task' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:63 C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `each' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `send' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `each' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:61 C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1737:in `in_namespace' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:821:in `namespace' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:58 C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1737:in `in_namespace' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:821:in `namespace' C:/rails_projects/little_ones_bend/config/../vendor/plugins/engines/ tasks/engine s.rake:54 C:/rails_projects/little_ones_bend/vendor/rails/railties/lib/tasks/ rails.rb:8:in `load' C:/rails_projects/little_ones_bend/vendor/rails/railties/lib/tasks/ rails.rb:8 C:/rails_projects/little_ones_bend/vendor/rails/railties/lib/tasks/ rails.rb:8:in `each' C:/rails_projects/little_ones_bend/vendor/rails/railties/lib/tasks/ rails.rb:8 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_re quire' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' C:/rails_projects/little_ones_bend/rakefile:10 C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:2149:in `load' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:2149:in `raw_load_rakefile ' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1897:in `load_rakefile' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exceptio n_handling' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1896:in `load_rakefile' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1880:in `run' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exceptio n_handling' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1878:in `run' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/bin/rake:31 C:/ruby/bin/rake:19:in `load' C:/ruby/bin/rake:19

2

Hi, I had this same problem. I am not sure of exactly what the internal issue is but if you do a sudo gem install -v=0.7.3 rake

and then

sudo gem uninstall rake and choose all the latest above it you should work

Brian

3

Brian Szucs wrote:

Hi, I had this same problem. I am not sure of exactly what the internal issue is but if you do a sudo gem install -v=0.7.3 rake

and then

sudo gem uninstall rake and choose all the latest above it you should work

Brian

If you can't uninstall rake version 0.8.x (which seems to be causing the problem), then run rake like rake _0.7.3_ [command_name] # for it to run the right version. GL.

4

You might want to just change your code to work. Do you have a “redefine_task” method by chance?

https://rubyforge.org/forum/forum.php?thread_id=20548&forum_id=20061

Cheers,

Walter McGinnis

http://katipo.co.nz/

5

This is happening in an "out of the box" install of substruct, which was developed in a prior version of ruby, rails, rake and engines. Now it is broken.

Redefine_task is part of the engines plugin which us non-compatible with rake above version 7.3 There is a Trac ticket to fix this.

What I really want to do is move substruct into 2.02 as a root app rather than an plugin, but I was trying to do some mods to an existing system that is running in the older environment. I just had a heck of a time reverting everything back. There is version 2.0 of engines, but I think it needs rails 2.0 and I froze at 1.2.5

Thanks

TW

6

I am not using engines or substruct so this must exist in another place. I will look around for it but substruct/enginess is not the only reason this is happening.