Ever wanted to disable options in a form select in rails? I have; it feels more useable to me to disable out of stock product sizes:

The rails Form Option Helpers won’t let you do this as they currently stand. So until things change in core, I’ve put together the option_tags_will_disable plugin.

simply specify the disabled values when calling options_for_select:

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options_for_select(
  ['Choose a size', 'small', 'medium', 'large'],
  nil,     # selected value
  'medium' # disabled value
)

Gives you:

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<option value="Choose a size">Please choose a size</option>
<option value="s">small</option>
<option value="m" disabled="disabled">medium</option>
<option value="l">large</option>

You can do the same when working with collections, but more interestingly, you can also give a Proc to identify which elements should be disabled:

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