Fixes for postgresql inet columns in Rails 4. They're backed by an IPAddr class now, which breaks sql parameter marker support, and automatically sets the attribute to nil when trying to assign an invalid ip address.

app/models/screened_ip_address.rb

@@ -21,7 +21,7 @@ class ScreenedIpAddress < ActiveRecord::Base
     #
     #   http://www.postgresql.org/docs/9.1/static/datatype-net-types.html
     #   http://www.postgresql.org/docs/9.1/static/functions-net.html
-    where('? <<= ip_address', ip_address).first
+    where("'#{ip_address.to_s}' <<= ip_address").first
   end
 
   def self.should_block?(ip_address)