Needs to be enabled in order to do automatic lookups.
# File lib/simple_form/components/readonly.rb, line 5 def readonly if readonly_attribute? && !has_readonly? input_html_options[:readonly] ||= true input_html_classes << :readonly end nil end
# File lib/simple_form/components/readonly.rb, line 15 def readonly_attribute? object.class.respond_to?(:readonly_attributes) && object.persisted? && object.class.readonly_attributes.include?(attribute_name.to_s) end