ActionController::UnknownFormat when creating rss feed in Rails 4

Question

So, I'm trying to add a rss feed into my rails 4 app, following this tuto, but I'm struggling with a ActionController::UnknownFormat that I understand it's happening in my controller.

hacks_controller.rb

          def index
            @hacks = Hack.order('id desc').paginate(:page => params[:page], per_page: 5)
          end

          def feed
            @hacks = Hack.where(:active => true)
            respond_to do |format|
              format.atom { render :template => 'feed.atom.builder', :layout => false }
            end
          end

feed.atom.builder

        atom_feed {language: 'en-US', url: root_url} do |feed|
          feed.title "My own blog title"
          feed.updated @hacks.maximum(:created_at)

          @hacks.each do |hack|
            feed.entry hack, {published: hack.created_at, updated: hack.updated_at} do |entry|
              entry.title hack.title
              entry.content post.text, type: 'html'
            end
          end
        end

I have tried changing

 format.atom { render :template => 'feed.atom.builder', :layout => false }

to

 format.atom { render :layout => false }

But still not working. The trace is

            ActionController::UnknownFormat - ActionController::UnknownFormat:
              actionpack (4.1.1) lib/action_controller/metal/mime_responds.rb:440:in `retrieve_collector_from_mimes'
              actionpack (4.1.1) lib/action_controller/metal/mime_responds.rb:256:in `respond_to'
               () Users/javier/Desktop/definitive/app/controllers/hacks_controller.rb:14:in `feed'
              actionpack (4.1.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
              actionpack (4.1.1) lib/abstract_controller/base.rb:189:in `process_action'
              actionpack (4.1.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
              actionpack (4.1.1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
              activesupport (4.1.1) lib/active_support/callbacks.rb:113:in `call'

Which version of Rails are you using?

Esse
– Esse

2014-10-20 18:35:17 +00:00
Commented Oct 20, 2014 at 18:35 — Esse
– Esse, Commented Oct 20, 2014 at 18:35

Snowman · Accepted Answer · 2017-01-13 01:35:59Z

2

In routes.rb:

get 'feed' => 'hack#feed', format: 'atom'

edited Jan 13, 2017 at 1:35

Snowman

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answered May 21, 2016 at 12:19

oleg prin

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Comments

eurek · Accepted Answer · 2015-05-21 14:42:11Z

0

I had the same problem with rss format, so I had to my route

defaults => { :format => 'rss' }

Try to change format by atom.

answered May 21, 2015 at 14:42

eurek

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Comments

MDickten · Accepted Answer · 2019-09-11 10:59:20Z

0

In my case, I had to add

get 'feed' => 'hack#feed', format: 'rss'

to the line in routes.rb. format: 'atom' didn't work, in spite of its being an atom feed.

answered Sep 11, 2019 at 10:59

MDickten

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