The Rails framework provides a large number of helpers for working with assets, dates, forms, numbers and model objects, to name a few. These helpers are available to all templates by default.
In addition to using the standard template helpers provided in the Rails framework, creating custom helpers to extract complicated logic or reusable functionality is strongly encouraged. By default, the controller will include a helper whose name matches that of the controller, e.g., MyController will automatically include MyHelper.
Additional helpers can be specified using the helper class method in ActionController::Base or any controller which inherits from it.
module FormattedTimeHelper def format_time(time, format=:long, blank_message=" ") time.blank? ? blank_message : time.to_s(format) end end
FormattedTimeHelper can now be included in a controller, using the helper class method:
class EventsController < ActionController::Base helper FormattedTimeHelper def index @events = Event.find(:all) end end
Then, in any view rendered by EventController, the format_time method can be called:
<% @events.each do |event| -%> <p> <%= format_time(event.time, :short, "N/A") %> | <%= event.name %> </p> <% end -%>
Finally, assuming we have two event instances, one which has a time and one which does not, the output might look like this:
23 Aug 11:30 | Carolina Railhawks Soccer Match N/A | Carolina Railhaws Training Workshop