如何在Ruby on Rails 5中验证pg数组长度？

class ArrayLengthValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    unless value.is_a?(Array) && value.length <= options[:max_length]
      record.errors.add(attribute, :array_length, options)
    end
  end
end

class YourModel < ApplicationRecord
  validates :my_array, array_length: { max_length: 10 }
end

en:
  activerecord:
    errors:
      models:
        your_model:
          attributes:
            my_array:
              array_length: "is too long (maximum is %{count})"