Question

I want to add a comment to every request send by active record in order to found source in mysql slow query. How can I modify the request before ActiveRecord sends it?

For example i want to have this in my central mysql slow query log.

SELECT * FROM articles
-- File: refresh-article.rb

Answer 1

I solve the problem with monkey patch

ActiveRecord::ConnectionAdapters::Mysql2Adapter.class_eval do
    def execute_with_log(sql, name=nil)
        sql = "-- Script: #{$0}\n#{sql}"
        execute_without_log(sql, name)
    end
    alias_method_chain :execute, :log
end