Ruby on Rails

I was just looking over some code I wrote last year, and found this in one of my mailers:

@item = eval(params[:item].classify).send(:find, params[:item_id])

The idea here is that I can have the mailer respond to a polymorphic link helper, and respond with an object reference of the referenced object, regardless which it was -- a Project, Campaign, Asset, Lightbox -- whatever. Inside the mailer erb, any links to that object would be as simple as

link_to @item.label, polymorphic_url(@item)

...so my mailer messages don't have to care what sort of object they are sending a link to. This year, seeing send in the same line as params is giving me the willies. Hence my question here.

Besides adding some guards around which classes I want to allow this for (which just occurred to me as I was typing this out) can you recommend any other techniques to make this less risky? Is there anything built into the framework that I am overlooking?

Thanks in advance,

Walter

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