Write safer code with SafeOperation.
Add this line to your application's Gemfile:
gem "safe_operation"And then execute:
$ bundle
Or install it yourself as:
$ gem install safe_operation
No monkey patch.
class RecordNotFound < StandardError; end
class User def self.find(id); new; end; end;
class Guest; end
class Admin; def initialize(user); end; end
class SuperAdmin; def initialize(admin); end; end
operation = SafeOperation.run do
User.find(1)
end
# Know if operation succeeded
operation.success?
# Get the value of the performed operation
operation.value
# Common patterns, reloaded
SafeOperation.run { User.find(1) }.value_or(Guest.new)
# Handling exceptions
SafeOperation.run { raise(RecordNotFound) }.value_or_else do |exception|
if exception.is_a?(RecordNotFound)
Guest.new
else
# logging, re-raise, etc.
end
end
# Apply on first operation
operation = SafeOperation.
run { User.find(1) }.
and_then { |user| Admin.new(user) }
operation.value # #<Admin ...>
# Chainable
operation = SafeOperation.
run { User.find(1) }.
and_then { |user| Admin.new(user) }.
and_then { |admin| SuperAdmin.new(admin) }
operation.value # #<SuperAdmin ...>
# Add or_else to handle failed operation
operation = SafeOperation.
run { raise(RecordNotFound) }.
and_then { |user| Admin.new(user) }.
or_else { Guest.new }
operation.success? # => false
operation.value # => #<Guest ...>See test suite for more examples.
This project follows the Moya Contributors Guidelines. TLDR: means we give out commit access easily and often.
Bug reports and pull requests are welcome on GitHub at https://github.com/JuanitoFatas/safe_operation. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.
Everyone interacting in the SafeOperation project’s codebases, issue trackers is expected to follow the code of conduct.