permalink_fu for text fields: How can I convert from blob to string output?

If I use permalink_fu on a text field I get this for the resulting permalink:

http://localhost:3000/243webb4ee4ff2227230b4232438591810c35d3f

instead of

http://localhost:3000/where-is-my-lost-cat

I assume this is because the text field becomes a blob in the database and permalink_fu only knows how to operate on string fields.

How could I convert this to a readab开发者_如何学Gole string version?

(without changing the database type from text to string)

---

Try commenting out these lines in your local version. See what the exception is, and trace that to your issue.