better_date_input.rb

# Could not call this DatepickerInput because it leads to
# the setting of css classes that cause chaos in the javascript/css
# side of things.
class BetterDateInput < SimpleForm::Inputs::StringInput
  def input(wrapper_options = nil)
    input_html_classes.unshift(:datepicker)
    input_html_options[:autocomplete] = 'off'

    value = @builder.object.send(attribute_name)
    input_html_options[:value] = case value
                                   when Date, Time, DateTime
                                     format = options[:format] || :calendar
                                     l(value, format: format)
                                   else
                                     value.to_s
                                 end

    merged_input_options = merge_wrapper_options(input_html_options, wrapper_options)
    @builder.text_field(attribute_name, merged_input_options)
  end
end