Validate an array data type in Ruby on Rails using a custom validator - PostGresQL allows arrays as a DB type.

validate_array_datatype.rb

# Define the validator
# app/validators/array_validator.rb

class ArrayValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, values)
    Array(values).each do |value|
      options.each do |key, args|
        validator_options = { attributes: attribute }
        validator_options.merge!(args) if args.is_a?(Hash)

        next if value.nil? && validator_options[:allow_nil]
        next if value.blank? && validator_options[:allow_blank]

        validator_class_name = "#{key.to_s.camelize}Validator"
        validator_class = begin
          validator_class_name.constantize
        rescue NameError
          "ActiveModel::Validations::#{validator_class_name}".constantize
        end

        validator = validator_class.new(validator_options)
        validator.validate_each(record, attribute, value)
      end
    end
  end
end

# include it in a model
class User
  validates :tags, array: { presence: true, inclusion: { in: %w{ ruby rails } }
end

how can I use rspec to test this code

Thanks for providing this validator.

It works perfectly fine except for a little fix in using this validator in the model.

validates :tags, presence: true, array: { inclusion: { in: %w(ruby rails) } }