Question

I have some Ruby code I need to execute in the Redmine Ruby app in order to enable a module in all projects at once.

Surprisingly, ruby does access the Projects, but raises a NoMethodError when accessing a few particular methods inside each of the “Project” objects.

Here is the code:

Project.find(:all).each do |project|

  print "Enabling modules for project '#{project.identifier}' ... "

  puts project.methods.sort            # this does print "enabled_module_names"
  puts project.enabled_module_names

end

This fails with:

hostname:/srv/apps/redmine# script/runner  vendor/plugins/customplugin/lib/enable_modules.rb
/var/lib/gems/1.8/gems/activerecord-2.3.5/lib/active_record/attribute_methods.rb:260:in `method_missing': undefined method `enabled_module_names' for #<Project:0x7f28985c1cb0> (NoMethodError)
    from vendor/plugins/customplugin/lib/enable_modules.rb:14
    from vendor/plugins/customplugin/lib/enable_modules.rb:7:in `each'
    from vendor/plugins/customplugin/lib/enable_modules.rb:7
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `eval'
    from /var/lib/gems/1.8/gems/rails-2.3.5/lib/commands/runner.rb:46
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from script/runner:3

I have scratched my head a lot, but I can’t grasp why would the code find the “Project” symbol but not the methods within, especially as “project.methods” does indeed list “enabled_module_names”.

Any help most welcome.

Answer 1

Are you sure that enable_module_names is an instance method?

Is it within Project.instance_methods?

Edit (summary of the comments below):

In earlier versions, you have to use following:

enabled_module_names = project.enabled_modules.collect(&:name)

The getter is present in later versions only (see rev.4460 for details of this change)