Ruby f.select: Syntax for assigning css class?

Question

ENVIRONMENT

ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin10.8.0]; Rails 3.2.6; OSX 10.6.8

QUESTION

Having tried many permutations of the following syntax, I have to ask (the probably stupid question), what is the proper syntax for assigning .css classes to Ruby f.select objects?

<%= f.select :fieldname, 
options_for_select( [[ t('selector_instruction_string'), ""]] + countries, 
resource.fieldname), 
html_options { :class => 'Select_100pct' } %>

See last line (broken for display).

This syntax (and many like it) are either ignored, or fail to raise errors (either).

Answer 1

To me it seems that, when I read the documentation, your code should be:

<%= f.select :fieldname, options_for_select(...), {}, { :class => 'Select_100pct' } %>

Because you only want to specify html_options, just pass in an empty Hash {} for options.