I have a variable that I want to pass with a form in rails.

The variable is not convenient because it is not part of the model. I really don't want to create a column in the DB just so I can pass the variable. 

When I try to pass the variable using something innocuous like:

```
<input type="hidden" id="blah" value=<%= "#{@blah}" %> />

```

The hidden field turns up correctly in the source, but doesn't pass with the params hash. When I code it properly with something like `id="review_blah"` rails assumes it's part of the review model and gets angry because it isn't part of the model.

Isn't there some workaround?? Some way to pass a variable easily for these circumstances, without rebuilding your model?

Thanks