Simple input form for time mask helper

gistfile1.rb

def simple_input_time_form(f, attribute_time, opts = {})
  default_opts = {
    value_field: f.object.send(attribute_time),
    attr_error: attribute_time,
    format_time: :time,
    icon_time: 'fa-clock-o',
    col_size: 4
  }
  opts = default_opts.merge(opts)
  
  %(<div class="col-md-#{opts[:col_size]}">
     <div class="form-group #{'has-error' if f.error opts[:attr_error]}">
        #{ f.label attribute_time }
        <div class="input-group">
          #{ f.input_field attribute_time, as: :string, \
                                           value: l(opts[:value_field], format: opts[:format_time]), class: 'time-mask'}
            <span class="input-group-addon">
              <span class="fa #{opts[:icon_time]}">
              </span>
            </span>
        </div>
        #{ f.error opts[:attr_error] }
    </div>
  </div>).html_safe
end

Example:

= simple_input_time_form(f, :start_time, col_size: 3)

@oswaldoferreira what is f?