Breadcrumbs on Rails Builder for Semantic UI & Fomantic UI (Updated for Rails 6)

semantic_breadcrumbs_builder.rb

class SemanticBreadcrumbsBuilder < BreadcrumbsOnRails::Breadcrumbs::Builder
  def render
    @elements[-1].options[:last] = true
    @elements.collect do |element|
      render_element(element)
    end.join(@options[:separator] || separator)
  end

  def render_element(element)
    element.options[:class] ||= 'section'
    content = if element.path.nil?
                compute_name(element)
              else
                @context.link_to_unless_current(compute_name(element), compute_path(element), element.options)
              end
    if element.options.delete(:last)
      @context.tag.div(content, class: 'active section')
    else
      ERB::Util.h(content)
    end
  end

  def separator
    @context.tag.div('/', class: 'divider')
  end
end

How to use with Rails 6

Put file to lib/builders/semantic_breadcrumbs_builder.rb and edit your app files

# config/application.rb
config.autoload_paths << Rails.root.join('lib/builders')

// app/views/layouts/application.html.slim
.ui.breadcrumb = render_breadcrumbs builder: SemanticBreadcrumbsBuilder