I needed to disable a bunch of select options on my select box in my simple_form_for

Simple form has an easy way to do this:

= f.association :countries, collection: ['Canada','USA','Mexico','Russia'], disabled: ['Russia','Mexico'] 

Now all of the options will still show in the list but only Canada and USA will be selectable.

Related External Links:

• Stack Overflow - adding-disable-to-certain-select-options-in-simple-form