Add 'open today' sidebar widget and open days in chapter lists

- open_erfas_today helper: samples 3 random open-day-tagged occurrences
  of the current day; widget hidden entirely on days without open
  chapters; heading shows current weekday
- content/_open_erfas_today partial rendered in right column above
  tags and featured articles
- _chapter partial: open-day schedules (event_schedule_text) shown
  inline in aggregated chapter lists with 'Offene Tage' label
- ccc.css: open_erfas_today added to existing right-column widget
  selector groups (headings, lists, links)

1 files changed, 16 insertions, 0 deletions

diff --git a/app/helpers/content_helper.rb b/app/helpers/content_helper.rb
index 53bf5b2..bf7287f 100644
--- a/app/helpers/content_helper.rb
+++ b/app/helpers/content_helper.rb
@@ -23,6 +23,22 @@ module ContentHelper
     )
   end
 
+  def open_erfas_today
+    occurrences = Occurrence
+      .find_in_range(Time.now.beginning_of_day, Time.now.end_of_day)
+      .joins(event: :tags)
+      .where(tags: { name: 'open-day' })
+      .reject { |o| o.node.nil? || o.node.head.nil? }
+      .sample(3)
+
+    return if occurrences.empty?
+
+    render(
+      :partial => 'content/open_erfas_today',
+      :locals  => { :occurrences => occurrences }
+    )
+  end
+
   def tags
     render :partial => 'content/tags'
   end