I'm receiving warning messages when TS is loading the applications models and I have an assumption it has to do with how the subclasses are initialized, but I am not sure of the exact fix.
rake ts:conf
Generating Configuration to config/development.sphinx.conf
Warning: Error loading /Users/sps/Sites/compass/app/models/asset/audio_asset.rb:
uninitialized constant Asset::AudioAsset
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bundler/gems/rails-267fb61277ac/activesupport/lib/active_support/inflector/methods.rb:230:in `block in constantize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bundler/gems/rails-267fb61277ac/activesupport/lib/active_support/inflector/methods.rb:229:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bundler/gems/rails-267fb61277ac/activesupport/lib/active_support/inflector/methods.rb:229:in `constantize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bundler/gems/rails-267fb61277ac/activesupport/lib/active_support/core_ext/string/inflections.rb:54:in `constantize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:64:in `block (2 levels) in load_models'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:54:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:54:in `block in load_models'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:53:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:53:in `load_models'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/context.rb:15:in `prepare'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx.rb:81:in `block in context'
<internal:prelude>:10:in `synchronize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx.rb:78:in `context'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/configuration.rb:156:in `generate'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/configuration.rb:172:in `build'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/thinking-sphinx-2.0.10/lib/thinking_sphinx/tasks.rb:80:in `block (2 levels) in <top (required)>'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:227:in `call'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:227:in `block in execute'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:222:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:222:in `execute'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:166:in `block in invoke_with_call_chain'
/Users/sps/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:159:in `invoke_with_call_chain'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:187:in `block in invoke_prerequisites'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:185:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:185:in `invoke_prerequisites'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:165:in `block in invoke_with_call_chain'
/Users/sps/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:159:in `invoke_with_call_chain'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/task.rb:152:in `invoke'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:140:in `invoke_task'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:98:in `block (2 levels) in top_level'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:98:in `each'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:98:in `block in top_level'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:107:in `run_with_threads'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:92:in `top_level'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:70:in `block in run'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:157:in `standard_exception_handling'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/lib/rake/application.rb:67:in `run'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/gems/rake-10.0.0/bin/rake:37:in `<top (required)>'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bin/rake:19:in `load'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bin/rake:19:in `<main>'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bin/ruby_noexec_wrapper:14:in `eval'
/Users/sps/.rvm/gems/ruby-1.9.2-p180@compass/bin/ruby_noexec_wrapper:14:in `<main>'