Can't create rss/atom feeds per tag anymore, with Middleman v4

[judge-red]

It seems that in Middleman v3, it was possible to create rss/atom feeds per tag like described here: https://forum.middlemanapp.com/t/middleman-blog-rss-feeds-per-tag/1478

However, this method seems to be using a state bug that was fixed in v4, according to this issue: https://github.com/middleman/middleman/issues/1831

How else can this be achieved?

Also, as a feature request: could this be implemented as a feature of this extension, so we can simply say blog.tag_feeds = true?

[tdreyno]

Something like this, I think.

blog = activate :blog

ready do
  blog.tags.each do |tag, articles|
    proxy "/tags/#{tag}/atom.xml", "/atom.xml", layout: false, locals: { tagname: tag, articles: articles }
  end
end

[judge-red]

@tdreyno exact same error:

/home/red_trela/git/blog/config.rb:79:in `block in evaluate_configuration!': undefined method `tags' for #<Middleman::BlogExtension:0x005608fead3ec0> (NoMethodError)
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:51:in `instance_exec'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:51:in `block in execute'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:1316:in `each'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:1316:in `traverse_depth_first'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:431:in `each'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:51:in `execute'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:28:in `block in install_methods!'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:52:in `instance_exec'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:52:in `block in execute'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:1316:in `each'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:1316:in `traverse_depth_first'
        from /home/red_trela/.gem/ruby/gems/hamster-2.0.0/lib/hamster/vector.rb:431:in `each'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:52:in `execute'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/callback_manager.rb:28:in `block in install_methods!'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/application.rb:292:in `start_lifecycle'
        from /home/red_trela/.gem/ruby/gems/middleman-core-4.0.0/lib/middleman-core/application.rb:265:in `initialize'
        from /home/red_trela/.gem/ruby/gems/middleman-cli-4.0.0/lib/middleman-cli/build.rb:51:in `new'
        from /home/red_trela/.gem/ruby/gems/middleman-cli-4.0.0/lib/middleman-cli/build.rb:51:in `build'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `block in invoke_all'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `each'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `map'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `invoke_all'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/group.rb:232:in `dispatch'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:115:in `invoke'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor.rb:40:in `block in register'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor.rb:359:in `dispatch'
        from /home/red_trela/.gem/ruby/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'
        from /home/red_trela/.gem/ruby/gems/middleman-cli-4.0.0/bin/middleman:23:in `<top (required)>'
        from /home/red_trela/bin/middleman:23:in `load'
        from /home/red_trela/bin/middleman:23:in `<main>'

[tdreyno]

There is an example in the docs of generic tags for MM (outside of blog features): https://middlemanapp.com/basics/upgrade-v4/

[RyanScottLewis]

I wrestled with this for a few hours last night and ended up here, figured I'd point out how I fixed it in case anyone does the same.

Move your ready block to after the activate(:blog) do; ...; end lines and use blog.data to access articles and tags.

Here's how I'm using it to generate xml and json files for each published article:

blog = activate(:blog) do |blog|
  # Config here...
end

ready do
  blog.data.articles.each do |article|
    proxy article.destination_path.gsub(".html", ".json"), "blog/article.json", locals: { article: article } if environment?(:development) || article.published?
    proxy article.destination_path.gsub(".html", ".xml"), "blog/article.xml", locals: { article: article } if environment?(:development) || article.published?
  end

  ignore "/blog/article.json"
  ignore "/blog/article.xml"
end

I would say some note in the documentation and this issue could be closed.

[iwarner]

@RyanScottLewis I do not believe you can access the blog articles in this fashion any longe, perhaps using sitemap.reources and checking that the template is a blog article may.

I use this for instance : you can easily manipulate I think to work of the Tag Template - I set a template : true in each templates frontmatter, maybe set tagTemplate : true on the tag one.

##
# Ready hook
# Add options to international template pages
##
ready do

    # Get all the french tags
    sitemap.resources.select{ | d | d.data.template }.each do | resource |

        if resource.path[ 0...5 ] === locale.to_s

            # puts "Process #{ resource.path }"

            resource.add_metadata options: {
                locale: locale,
                lang:   locale
            }

        end

    end

end

Closing, please re-open if still an issue