counting q

gistfile1.rb

class Activity < ActiveRecord::Base
  # Activity#result is a boolean
end

# Let's say

Activity.all.pluck(:result) # => [false, true, false, false, false, true]

# How can I calculate the number of the false results before that true one?

def failed_attempts(activities)
  activities = activities[0..-2] if activities.last == true

  return activities.length - activities.rindex(true) - 1
end

puts failed_attempts(Activity.all.pluck(:result))
# >> 3