tag autocomplete and better browsing

models/tag.rb

@@ -11,4 +11,15 @@ class Tag < Sequel::Model
   def self.create_unless_exists(name)
     dataset.filter(name: name).first || create(name: name)
   end
+
+  def self.suggestions(name, limit=3)
+    Tag.filter(name: /^#{name}/).
+    order(:name).
+    limit(limit).
+    all
+  end
+
+  def self.popular_names(limit=10)
+    DB["select tags.name,count(*) as c from sites_tags inner join tags on tags.id=sites_tags.tag_id where tags.name != '' group by tags.name having count(*) > 1 order by c desc LIMIT ?", limit].all
+  end
 end