Rails Postgres Array Column Validator

array_inclusion_validator.rb

# app/models/validators/array_inclusion_validator.rb
class ArrayInclusionValidator < ActiveModel::EachValidator
  include ActiveModel::Validations::Clusivity

  def validate_each(record, attribute, values)
    values.each do |value|
      unless include?(record, value)
        message = (options[:message].try(:gsub, '%{value}', value) || "#{value} is not included in the list")
        record.errors.add(attribute, :array_inclusion, message: message, value: value)
      end
    end
  end
end

demo_model.rb

# app/models/model.rb
class DemoModel < ApplicationRecord
  BULB_THINGS = %w[A19 B52 C3P0]
  validates :things, array_inclusion: { in: BULB_THINGS }
end