Is there any gem which works on Rails 3 that can show which part of my code generated which SQL query?
On Rails 2.3 there was plugin called query_trace, but it doesn't seem to work on Rails 3, it generates following error:
alias_method': undefined method `log_info' for class `ActiveRecord::ConnectionAdapters::AbstractAdapter' (NameError)
QueryTrace doesn't work as-is because many changes were made in Rails 3 esp in the area of ActiveRecord.
So, hacking around, I made it work like this:
You just need the 2 files below in the locations mentioned. Then restart the web server.
After the SQL, you should see Called from:
in a console (magenta on white) and log file
In /vendor/plugins/query_trace/lib/query_trace.rb
module QueryTrace
def self.append_features(klass)
super
klass.class_eval do
unless method_defined?(:log_info_without_trace)
alias_method :log_info_without_trace, :sql
alias_method :sql, :log_info_with_trace
end
end
end
def log_info_with_trace(event)
log_info_without_trace(event)
logger.debug("\e[1m\e[35m\e[1m\e[47mCalled from:\e[0m " + clean_trace(caller[2..-2]).join("\n "))
end
def clean_trace(trace)
Rails.respond_to?(:backtrace_cleaner) ?
Rails.backtrace_cleaner.clean(trace) :
trace
end
end
In /vendor/plugins/query_trace/init.rb
require 'query_trace'
class ::ActiveRecord::LogSubscriber
include QueryTrace
end
https://github.com/lightyear/sql-logging
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