Active Record ENUM based state machine. Whether you can control enum transation from one state to another state. Suppose you have an user model and you want to once user has been rejected he can't be verified, You can achive this job easily using this library.
Add this line to your application's Gemfile:
gem "snm-enum-transition"And then execute:
$ bundleOr install it yourself as:
$ gem install snm-enum-transition# You have an user model and you want to specify status transitions: initial to verified, initial to rejected and rejected to initial
class User
include Snm::Enum::Transition
enum status: {initial: 0, verified: 1, rejected: 2]
# Specify (allow enum transition) column name, from and to
snm_enum_transitions :status, :initial, [:verified, :rejected]
snm_enum_transitions :status, [:rejected], [:initial]
end
user = User.create(status: :initial)
# IF user status is initial
user.verified! # Okay
user.rejected! # Okay
# IF user status is verified
user.rejected! # ActiveRecord::RecordInvalid: Validation failed: Status can't be changed from verified to rejected
user.initial! # ActiveRecord::RecordInvalid: Validation failed: Status can't be changed from verified to initial
# IF user status is rejected
user.initial! # Okay
user.verified! # ActiveRecord::RecordInvalid: Validation failed: Status can't be changed from rejected to verifiedBug reports and pull requests are welcome on GitHub at https://github.com/snmmaurya/snm-enum-transition. 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.