Provide parameter for rake in ruby

I have a rake task that uses a parameter on the command line like that:

rake sunspot:reindex[, MyModel]
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(Yes, the direct comma behind the bracket is correct.)

How do I specify the same rake command from within Ruby?

Some attempts that don't work:

Rake::Task['sunspot:reindex'].execute("[, ActsAsTaggableOn::Tagging]")
Rake::Task['sunspot:reindex'].execute([nil, ActsAsTaggableOn::Tagging])
Rake::Task['sunspot:reindex[, ActsAsTaggableOn::Tagging]'].execute

Some other suggestions what I could try else?

You probably need to use invoke instead of execute:

Rake::Task['sunspot:reindex'].invoke(nil, ActsAsTaggableOn::Tagging)

You can invoke the command as a system process. You have several alternatives

klass = Model

`rake sunspot:reindex #{klass}`
%x(rake sunspot:reindex #{klass})
system "rake", "sunspot:reindex", klass