app/inputs/radio_buttons_inline_input.rb
class RadioButtonsInlineInput < SimpleForm::Inputs::CollectionRadioButtonsInput
def input(wrapper_options)
label_method, value_method = detect_collection_methods
@builder.send("collection_radio_buttons", attribute_name, collection, value_method,
label_method, input_options, input_html_options,
&collection_block_for_nested_boolean_style)
end
protected
def item_wrapper_class
"radio radio-inline"
end
end