FEATURE: Allow posting a link with topics

lib/discourse_featured_link.rb

@@ -0,0 +1,27 @@
+module DiscourseFeaturedLink
+  CUSTOM_FIELD_NAME = 'featured_link'.freeze
+
+  AdminDashboardData::GLOBAL_REPORTS << CUSTOM_FIELD_NAME
+
+  Report.add_report(CUSTOM_FIELD_NAME) do |report|
+    report.data = []
+    link_topics = TopicCustomField.where(name: CUSTOM_FIELD_NAME)
+    link_topics = link_topics.joins(:topic).where("topics.category_id = ?", report.category_id) if report.category_id
+    link_topics.where("topic_custom_fields.created_at >= ?", report.start_date)
+               .where("topic_custom_fields.created_at <= ?", report.end_date)
+               .group("DATE(topic_custom_fields.created_at)")
+               .order("DATE(topic_custom_fields.created_at)")
+               .count
+               .each { |date, count| report.data << { x: date, y: count } }
+    report.total = link_topics.count
+    report.prev30Days = link_topics.where("topic_custom_fields.created_at >= ?", report.start_date - 30.days)
+                                   .where("topic_custom_fields.created_at <= ?", report.start_date)
+                                   .count
+  end
+
+  def self.cache_onebox_link(link)
+    # If the link is pasted swiftly, onebox may not have time to cache it
+    Oneboxer.onebox(link, invalidate_oneboxes: false)
+    link
+  end
+end