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.