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Example

  • We can check if a value is included in an array using the inclusion: helper.
  • The :in option and its alias, :within show the set of acceptable values.
class Country < ApplicationRecord
  validates :continent, inclusion: { in: %w(Africa Antartica Asia Australia
                                            Europe North America South America) }
end
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  • To check if a value is not included in an array.
  • Using the exclusion:.
class User < ApplicationRecord
  validates :name, exclusion: { in: %w(admin administrator owner) }
end
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