Keep data if transaction fails? - ruby-on-rails

Question

I've got a transaction which needs detailed logging, even if it fails. How can I do that?
This is my code:
# csv gets loaded etc.
import = CsvImport.new
import.logger += 'Starting import'
ActiveRecord::Base.transaction do
import.logger += 'CSV loaded, starting import'
csv_array.each_with_index do |row, index|
begin
unless importer.has_key?(row[0])
import.logger += 'Key not found'
raise StandardError
end
result = CsvImporter.import_line(row[0])
import.logger += 'Imported line #{index} successfully' if result
rescue
import.logger += 'Transaction aborted!'
end
end
import.logger += 'Transaction successful!'
end
In a failed transaction, the logger only has "Starting import" without any of the added strings inside the transaction - obviously. How can I keep that data?

Answer 1

The begin-rescue block is just a wrapper to catch exceptions. In your case you need, like you said, a transaction. You can use something like this
YourClass.transaction do
# do a lot of stuff
end
or
#yourmodel.transaction do
# do stuff !
end
Look at the docs: http://api.rubyonrails.org/classes/ActiveRecord/Transactions/ClassMethods.html
A combination of transaction and rescue block are possible: Look at the docs at section "Exception handling and rolling back"