* Continued work on improving post view templates

* Added statistics-based estimator for related tag calculator
* Fleshed out IpBan class based on changes to Danbooru 1.xx

app/models/ip_ban.rb

@@ -6,4 +6,24 @@ class IpBan < ActiveRecord::Base
   def self.is_banned?(ip_addr)
     exists?(["ip_addr = ?", ip_addr])
   end
+
+  def self.search(user_ids)
+    comments = count_by_ip_addr("comments", user_ids, "creator_id")
+    posts = count_by_ip_addr("post_versions", user_ids, "updater_id")
+    notes = count_by_ip_addr("note_versions", user_ids, "updater_id")
+    pools = count_by_ip_addr("pool_updates", user_ids, "updater_id")
+    wiki_pages = count_by_ip_addr("wiki_page_versions", user_ids, "updater_id")
+    
+    return {
+      "comments" => comments,
+      "posts" => posts,
+      "notes" => notes,
+      "pools" => pools,
+      "wiki_pages" => wiki_pages
+    }
+  end
+  
+  def self.count_by_ip_addr(table, user_ids, user_id_field = "user_id")
+    select_all_sql("SELECT ip_addr, count(*) FROM #{table} WHERE #{user_id_field} IN (?) GROUP BY ip_addr ORDER BY count(*) DESC", user_ids)
+  end
 end