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 pub fn nth(n: u32) -> Option<u32> {
     pub fn is_prime(n: u32) -> bool {
         if n == 1 {return false};
         if n == 2 {return true};
         let sqrt_n = ((n as f32).sqrt() as u32) + 1;

         for i in 2..sqrt_n {
             if n % i == 0 {return false};
         }
         true

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User.joins('LEFT JOIN "invoices" ON "invoices"."merchant_id" = "users"."id"').group("users.id").having("count(*) <= ?", 5)

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WITH messages_ranks AS (
                           SELECT *,
                                  rank() OVER ( PARTITION BY channel_id ORDER BY created_at DESC) AS rank
FROM messages
)
SELECT row_to_json(t)
FROM (
         SELECT channels.id,
                channels.name,
                channels.owner_id,

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sequence1 = %w[d c b]
sequence2 = %w[e a f]
base = %w[z a c d f y b]

def sort_by_sequence(sequence:)
  array = yield
  array.select { |el| sequence.include?(el) }.sort do |left, right|
    sequence.index(left) <=> sequence.index(right)
  end | sort_by_alfabet { array }
end

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# frozen_string_literal: true

# @example provides Redis distributed lock api
#
# $ TemporaryLock.create!(:example, 'c22a0420-51c8-4e47-843c-92a37e8d2eba')
#   => #<TemporaryLock:0x000055b43e328410 @key="temporary_lock:example:c22a0420-51c8-4e47-843c-92a37e8d2eba">
#
# @example raises `TemporaryLock::StaleObjectError` when `id` already registered
#
# $ TemporaryLock.create!(:example, 'c22a0420-51c8-4e47-843c-92a37e8d2eba')