MySQL server has gone away fix - Ensure it only affects mysql2 adapter

connection_fix.rb

# If your workers are inactive for a long period of time, they'll lose
# their MySQL connection.
#
# This hack ensures we re-connect whenever a connection is
# lost. Because, really. why not?
#
# Stick this in RAILS_ROOT/config/initializers/connection_fix.rb (or somewhere similar)
#
# From:
#   http://coderrr.wordpress.com/2009/01/08/activerecord-threading-issues-and-resolutions/

adapter = ActiveRecord::Base.configurations[Rails.env]['adapter']

if adapter == "mysql2"
 module ActiveRecord::ConnectionAdapters
   class Mysql2Adapter
     alias_method :execute_without_retry, :execute

     def execute(*args)
       execute_without_retry(*args)
     rescue ActiveRecord::StatementInvalid => e
       if e.message =~ /server has gone away/i
         warn "Server timed out, retrying"
         reconnect!
         retry
       else
         raise e
       end
     end
   end
 end
end