tl;dr: Use with_index

ActiveRecord's find_each with index

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Read more Show archive.org snapshot

If you do not provide a block to find_each, it will return an Enumerator Show archive.org snapshot for chaining with other methods:

Person.find_each.with_index do |person, index|
  person.award_trophy(index + 1)
end

Ruby's map with index

Similarly, you may need an index when using other methods, like map, flat_map, detect (when you need the index for detection), or similar. Here is an example for map:

people.map.with_index do |person, index|
  person.at_rank(index + 1)
end