high level rules order

high_level_rule_ex2.rb

schema = Dry::Validation.Schema(Dry::Validation::Schema::Params) do
  configure do
    option :user

    def exists?(value)
      # your code
    end

    def free?(uid, value)
      # your code
    end
  end

  required(:provider).filled(:str?)
  required(:uid).filled(:str?)
  optional(:token).maybe(:str?)

  rule(identity_taken: %i[provider token]) do |provider, token|
    token.exists? > provider.free?(value(:uid))
  end
end