Just a follow up in case this helps anyone else:
> You could also probably put a literal "<br>" in the error message, then
> use unescape_html.
As it turns out, simple_format was wrapping everything in < p > tags,
which was causing invalid html to be generated in the error view of my
form.
So, I tried Maren's suggestion and came up with the following:
in environment.rb
require 'cgi'
Error message in model:
errors.add(field, "This field is too long.%3cbr %3eYou are using
#{self[field].length} characters out of a permitted #{permitted}.")
And in the view:
<%= CGI.unescape(error_message_on :applicant, :thesis) %>
This works just fine and produces valid markup in the form's error view.
Thanks Maren.
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