How do I validate members of an array field?

Question

I have this model:

class Campaign

  include Mongoid::Document
  include Mongoid::Timestamps

  field :name, :type => String
  field :subdomain, :type => String
  field :intro, :type => String
  field :body, :type => String
  field :emails, :type => Array
end

Now I want to validate that each email in the emails array is formatted correctly. I read the Mongoid and ActiveModel::Validations documentation but I didn't find how to do this.

Can you show me a pointer?

Answer 1

You can define custom ArrayValidator. Place following in 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

You can use it like this in your models:

class User
  include Mongoid::Document
  field :tags, Array

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

It will validate each element from the array against every validator specified within array hash.