Issue when using crosswords larger than 20x20

First of all, thank you for this software! I have been self-hosting a slightly modified version using NYT crosswords to play with my friends and it has been a wonderful addition to the sometimes dreary pandemic life.

We were stumped by an occasional bug that made it impossible for new joiners to see existing crosswords. It's based in app/channels/moves_channel.rb:

  def subscribed
    stream_from(channel_name)
    data = redis.hgetall(channel_name)

    grid = Array.new(20) { Array.new(20) }

    data.each {|k, v|
      x, y = k.split('-')
      next if x.nil? or y.nil?
      next unless x.to_i.in?(0..20) && y.to_i.in?(0..20)
      grid[x.to_i][y.to_i] = v
    }

    transmit({'initialState': grid})
  end

This code will fail if x == 20. To make it work, the line should be next unless x.to_i.in?(0..19) && y.to_i.in?(0..19).

This only happens in crosswords larger than 20x20. In general, this function will not work properly for crosswords of that size. In my version, I fixed this by using grid = Array.new(50) { Array.new(50) } and next unless x.to_i.in?(0..49) && y.to_i.in?(0..49). However, it might be good to make the grid size dynamic anyway, or at least base it on a MAX_CROSSWORD_SIZE constant.

This is not a bug that will affect your current deployment, I'm only mentioning it because you expressed interest in how to support other crosswords in another issue.

Thank you again for creating this wonderful piece of software! Please know that you've enabled hours of joy :)

zetter / multicrosser

Issue when using crosswords larger than 20x20 #42