A dependency-free library to manage transactions in Ruby
Based on the sagas design pattern (http:https://www.cs.cornell.edu/andru/cs711/2002fa/reading/sagas.pdf)
Add this line to your application's Gemfile:
gem 'sagas'
And then execute:
$ bundle
Or Install locally:
$ gem install sagas
require 'sagas'
num = 0
transaction = Sagas.transaction
exceptions_to_catch = [StandardError]
transaction.run_command(name: 'Add', catch_exceptions: exceptions_to_catch) do
perform do
num += 10
end
undo do
num -= 10
end
end
transaction.run_command(name: 'Multiply', catch_exceptions: exceptions_to_catch) do
perform do
num *= 2
raise StandardError.new('Error while trying to perform')
end
undo do
num /= 2
end
end
transaction.run_command(name: 'Subtract', catch_exceptions: exceptions_to_catch) do
perform do
num -= 7
end
undo do
num += 7
end
end
puts num #outputs 0 (will perform all undo effects up to the exception abort transaction)
The gem is available as open source under the terms of the MIT License.