Problem of visibility of variable ruby on rails

[Anderson]

There's a code

j = 0
10.times do |i|
  if @days[k].mday == reservs_room[j][0].mday then
    colspan = reservs_room[j][1]*2
    j += 1
  else
    colspan = 1 
  end
end

Shouting and fighting.

undefined method `[] for nil:NilClass

I'm changing.

10.times do |i|
  if @days[k].mday == reservs_room[0][0].mday then
    colspan = reservs_room[0][1]*2
  else
    colspan = 1 
  end
end

What's going on?

Full example:

    @days = Array.new(daysCount)
    i = 0; (-2..daysCount - 3).map {|n| @days[i] = Time.now + n.day; i += 1;}
@reserv_cols = Array.new(@rooms.length)

@rooms.each_index do |row_index|
  @reserv_cols[row_index] = []
  k = 0

  reservs_room = [[(Time.now), 3], [(Time.now+5.day), 5]]
  sum_day_reserv = 8

  j = 0
  num = 2*daysCount-1-sum_day_reserv*2
  num.times do |i|

    if @days[k].mday == reservs_room[j][0].mday then
      colspan = reservs_room[j][1]*2
      j += 1
    else
      colspan = 1 
    end

    @reserv_cols[row_index].push([@days[k], colspan])
    if i.odd? then k += 1 end
  end
end

[elysha]

You have a mass. reservs_room size equal 2- Mm:

reservs_room = [[(Time.now), 3], [(Time.now+5.day), 5]]

a possible values j c 0 before 2*daysCount-1-sum_day_reserv*2Well, let's say it's your day. 16amount 8 and at j equal 2-м You get this:

reservs_room[j]

value nil♪