Enabling stemming from sphinx.yml in Thinking Sphinx

I created a config/sphinx.yml file with the line: morphology: stem_en

After running rake ts:config, it doesn't seem to have changed development.sphinx.conf, and following a rebuild, searching for "dawg" doesn't match "dawgs".

How can I get this to work?

From stackoverflow

• If I recall correctly the morphology line should fall under a "development" header like so:

  development:
    morphology: stem_en
  

  Not sure if you've done so already, but if not give it a try.

  pat : Yup, config/sphinx.yml expects environment keys for each group of settings.