Upgrading blog to v4

I’m trying to upgrade my blog after a long time of inactivity. Most things worked out of the box however I’m having trouble with accessing blog articles. I have two blogs, one named “articles” and another named “essays”. Here is my config.rb:

# blogging
activate :blog do |blog|
  # This will add a prefix to all links, template references and source paths
  blog.name ="articles"
  blog.prefix = "articles"
  blog.permalink = "{year}/{month}/{day}/{title}.html"
  blog.custom_collections = {
    category: {
      link: '/categories/{category}.html',
      template: '/articles_category.html'
    }
  }
  # Matcher for blog source files
  blog.sources = "{year}-{month}-{day}-{title}.html"
  blog.layout = "post"
  blog.summary_separator = /(READMORE)/
  blog.summary_length = 250
  blog.year_link = "{year}.html"
  blog.month_link = "{year}/{month}.html"
  blog.day_link = "{year}/{month}/{day}.html"
  blog.default_extension = ".markdown"
end

# Essays
activate :blog do |blog|
  # This will add a prefix to all links, template references and source paths
  blog.name ="essays"
  blog.prefix = "essays"
  blog.permalink = "{year}/{month}/{day}/{title}.html"
  blog.custom_collections = {
    category: {
      link: '/categories/{category}.html',
      template: '/essays_category.html'
    }
  }
  blog.sources = "{year}-{month}-{day}-{title}.html"
  blog.layout = "essay"
  blog.summary_separator = /(READMORE)/
  blog.summary_length = 250
  blog.year_link = "{year}.html"
  blog.month_link = "{year}/{month}.html"
  blog.day_link = "{year}/{month}/{day}.html"
  blog.default_extension = ".markdown"
end

The index looks like this:

/ Display multiple Blog posts
#frontblog
  %h1.section
    Articles
    %a.inline{:href => '/feed-articles.xml'}
      %i.fa.fa-rss
  - blog('articles').articles[0...10].each do |article|
    %p.hpost
      %i.fa.fa-pencil
      = link_to article.title, article.url
      %span{:class => "frdate"}
        %time{:datetime => "#{article.date.strftime('%Y-%m-%d')}"}= article.date.strftime('%Y %b %d')
  %p.meta_inline{style: 'margin-left: 5%;'}
    %i.fa.fa-arrow-right
    = link_to 'browse articles archive', '/articles.html'
  %br
  %h1.section
    Essays
    %a.inline{:href => '/feed-essays.xml'}
      %i.fa.fa-rss
  - if blog('essays').articles.size > 2
    - blog('essays').articles[0...3].each do |essay|
      %p.hpost
        %i.fa.fa-leaf
        = link_to essay.title, essay.url
        %span{:class => "frdate"}
          %time{:datetime => "#{essay.date.strftime('%Y-%m-%d')}"}= essay.date.strftime('%Y %b %d')
  -else
    - blog('essays').articles.each do |essay|
      %p.hpost
        %i.fa.fa-leaf
        = link_to essay.title, essay.url
        %time{:datetime => "#{essay.date.strftime('%Y-%m-%d')}"}= essay.date.strftime('%Y %b %d')
  %p.meta_inline{style: 'margin-left: 5%;'}
    %i.fa.fa-arrow-right
    = link_to 'browse essays archive', '/essays.html'

  %h1.section
    Projects
    %i.fa.fa-terminal

  %i.fa.fa-code
  = link_to 'argosnap', 'https://github.com/atmosx/argosnap'
  %span{:class => "project_description"}
    Enhanced tarsnap notifications.

However, the articles are empty. I’m not getting an error or exception, meaning no HAML syntax error, the articles object exists and is a list of objects, which have the methods, I tested article.methods.sort.join(', ') returns the expected set of methods, but the article titles do not get displayed. Here is a sample HTML result block:

<p class='hpost'>
<i class='fa fa-pencil'></i>
<a href="/articles/2016/10/01/security-policies-for-remote-workers.html"></a>
<span class='frdate'>
<time datetime='2016-10-01'>2016 Oct 01</time>
</span>
</p>

As you can see the article.title is empty. My directory source layout is like:

404.html.haml
articles
  2007-03-15-Tourkia-Ellada-kai-EE.markdown
  2008-04-27-Pws-na-kerdisete-thn-sympatheia-twn-petherikwn-sas.markdown
  2009-03-06-taksidi-sto-verolino.markdown
  [...]
articles.html.haml
articles_category.html.haml
assets
essays
essays.html.haml
essays_category.html.haml
fonts
index.html.haml
javascripts
layouts
pages
partials
stylesheets

Ideas / thoughts are welcome!

Best Regards,

atmosx

I wonder if naming a blog articles is possible, since this a method name for listing a blog’s articles list. Maybe it worked correctly before but now is not? Can you try, just to be sure, to change the name of the blog?