[Rails] how to delete with ajax

Hello, I'm trying to create a link to delete the record of a discount
in my database. I have a page that lists them, each one rendered in a
partial with a delete link. I'm trying link_to_remote, but it gives me
this errors:

No method responded to 28 (which is the record id)

Here is a link to my code:

http://pastie.org/private/s1m8ddsb27fyad8z1rhyg

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