One solution to update out-of-sync association counters

update_counters.rb

def update_counter(record, *names)
  updates = names.each_with_object({}) do |name, memo|
    counter = "#{name}_count"
    diff = record.send(name).count - record.send(counter)
    memo[counter] = diff unless diff.zero?
  end
  record.class.update_counters(record.id, updates) if updates.any?
end

Community.paginated_each(:per_page => 100) do |record|
  update_counter(record, :videos, :members, :comments)
end

User.paginated_each(:per_page => 200) do |record|
  update_counter(record, :videos)
end

Media.paginated_each(:per_page => 1000) do |record|
  update_counter(record, :comments)
  update_counter(record, :likes)
end