ruby on rails - Controller method #show getting called -

i have link on #index view:

<%= link_to 'export calendar (ics)', { controller: :tickets, action: :ics_export, format: :ics }, class: "class-needed right" %> 

routes.rb pertains this:

resources :tickets 'tickets/calendar' => 'tickets#ics_export' post 'tickets' => 'tickets#index' patch 'tickets/:id/close' => 'tickets#close', as: 'close_ticket' post 'tickets/:id' => 'ticket_comments#create' 

my ticketscontroller pertains:

before_action :set_ticket, only: [:show, :edit, :destroy, :update, :close]  def show   @ticket_comment = ticketcomment.new end  def ics_export   tickets = ticket.all   respond_to |format|     format.html     format.ics       cal = icalendar::calendar.new       tickets.each |ticket|         event = icalendar::event.new         event.dtstart = ticket.start         event.description = ticket.summary         cal.add_event(event)       end       cal.publish       render :text =>  cal.to_ical     end   end end  private def set_ticket   @ticket = ticket.find(params[:id]) end 

and when click link, takes me /tickets/calendar.ics correct following error:

activerecord::recordnotfound in ticketscontroller#show

couldn't find ticket 'id'=calendar

extracted source (around line #83):

 private  def set_ticket    @ticket = ticket.find(params[:id])  end 

the @ticket = ticket.find(params[:id]) highlighted. make sense failing call ticket id of calendar.

request has parameters:

{"id"=>"calendar", "format"=>"ics"}

how fix error? why calling show action?

there footnote in canonical rails routing outside in effect:

rails routes matched in order specified, if have resources :photos above 'photos/poll' show action's route resources line matched before line. fix this, move line above resources line matched first.

as commented, fix specify get 'tickets/calendar' => ... ahead of resources :tickets. if order of routes in question, can run rake routes, which, best of knowledge, should render routes in order checked.