Rails - Oct 2006 - How to obtain list of attributes specified in a validation?

I''ve been dealing with a lot of forms lately, and wanted to have some
way of indicating to the user that a specified field is required, such
as displaying some icon or asterisk next to it, but if the form is
submitted with errors, this icon/asterisk will change to another
image, such as a big red X.

The best solution I could come up with was to override a few of the
input tag helpers, such as text_field and text_area so that they
accept an additional parameter, ":required => true" which will then
place a "<span
class=''required''>...</span>" around the element.
My
"required" CSS class then uses a background image, offset to the
right, to denote that a field is required.

When a field is submitted with errors, rails adds the "<span
class=''fieldwitherrors''>...</span>" around my
"<span
class=''required''>...</span>" tag, so I can then
use CSS rules to
change the image to something else (a red X in this case).

What I''m wondering is how to determine (from within my overridden
text_field method) which attributes of the model have been specified
in the "validates_presence_of" method.  I figure it''d be
cleaner to
simply check which fields are required to be non blank, as specified
in the model, rather than force the programmer to write ":required =>
true" for each of these fields.

If anyone has any suggestions, or ideas of where I should look, please
let me know.  Thanks,

Mike


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