What's the problem with this sentense, i'm getting 'invalid date' error

Question

I am building a timeline chart, so while i am making an array for it, the problem with 'invalid date' appears, maybe i messed up with .map, cause i don't know ruby well

status_and_date = StatusVersion.where(requeat_id:812).pluck(status_id, :date).reverse
@requests_timeline = status_and_date.map do  |r,s| 
  s=s.to_s
  for i in 0..s.length-1

     label = r.to_s

     start_date = s[i].to_date

     end_date = s[i+1].to_date
     [label, start_date, end_date]

     end
  end
  @requests_timeline

Answer 1

Assume that the status_id is incremental by 1. I guess The problem is in your loop, if i == s.length -1 then, s[i+1] will be nil You can use begin ... rescue to catch error to see the detail error by modifying your loop using below code

for i in 0..s.length-1

   begin
     label = r.to_s

     start_date = s[i].to_date

     end_date = s[i+1].to_date
     [label, start_date, end_date]

   rescue
     puts "i - #{i}"
     puts "s[i] - #{s[i]}"
     puts "s[i+1] - #{s[i+1]}"
   end
end