Create Cards from one Trello Card's Activities

trello_card_activities_to_card.rb

require 'ruby-trello'

# Also requires your Trello Keys (see the .gem docs)

board_id = "ENTER-YOUR-OWN-BOARD-ID"

# Getting actions from one Card
@board = Trello::Board.find(board_id)
@lists = @board.lists
@list = @lists.first
@cards = @list.cards
@card = @cards.first
actions = @card.actions

# Creating an array from the Actions
array = []
actions.each do |a|
  array << a.attributes[:data]["text"]
end
array.compact!
array

# Writing Actions from the Array
@board = Trello::Board.find(board_id)
@list = @board.lists.select { |l| l.name == "NAME-OF-YOUR-LIST" }.first

# reversed, because Actions are sorted DESC
# Newly created Cards go on top
array.reverse.each do |za| 
  Trello::Card.create(list_id: @list.id, name: za)
end