codesnips

enum

ruby 
class CreateSubscriptions < ActiveRecord::Migration[7.1]
  STATUSES = %w[pending active past_due canceled].freeze

  def change
    create_table :subscriptions do |t|
      t.references :account, null: false, foreign_key: true

Schema-Backed Enums (DB Constraint + Rails enum)

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rust 
use std::error::Error;
use std::fmt;
use std::io;
use std::num::ParseIntError;

#[derive(Debug)]

Custom Error Enum With From Conversions for the ? Operator in Rust

rust error-handling traits
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ruby 
class Order < ApplicationRecord
  class InvalidTransition < StandardError; end

  enum status: { pending: 0, paid: 1, shipped: 2, cancelled: 3 }

  has_many :order_transitions, -> { order(:created_at) }, dependent: :destroy

Order State Machine With Guarded Transitions and an Audit Trail in Rails

rails state-machine activerecord
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