Can't create or update records in a loop, using ActiveStorage - ruby-on-rails-6

Question

Ruby 2.6.3
Rails 6.0.3
I don't why, when I try to create or update a record in a loop, adding an attachment or attachments, just only one or two recoreds can be updated. I also tested this behaviour with only one attachment and only for creating. But the behaviour is the same.
In the code below, I'm trying to reload attachments on aws, using active storage. But only 1 record is updated.
namespace :uploads do
task migrate_to_active_storage: :environment do
Upload.where.not(csv_file_name: nil).find_each do |upload|
%w[csv log].map do |attachment_type|
attach_url = [
'https://',
ENV['AWS_BUCKET'],
".s3-#{ENV['AWS_REGION']}.amazonaws.com/",
upload.business.normalized_name,
'/upload/',
upload.id.to_s,
"/#{attachment_type}/",
upload.csv_file_name
].join
upload.send(attachment_type).attach(
io: open(attach_url),
filename: upload["#{attachment_type}_file_name"],
content_type: upload["#{attachment_type}_content_type"]
)
end
end
ap 'DONe WITH SUCCESS' # never appears
end
end
I've managed to fix this, using threds. But I don't know why it doesn't work in the code above.
This solution works fine.
namespace :uploads do
task migrate_to_active_storage: :environment do
uploads = Thread.new { Upload.ids }.value
uploads.each do |id|
Thread.new do
sleep 2
upload = Upload.find id
upload.update csv: get_attachment(upload, 'csv'),
log: get_attachment(upload, 'log')
end.join
end
end
end
def get_attachment(upload, attachment_type)
attachment_url = [
'https://',
ENV['AWS_BUCKET'],
".s3-#{ENV['AWS_REGION']}.amazonaws.com/",
upload.business.normalized_name,
'/upload/',
upload.id.to_s,
"/#{attachment_type}/",
upload["#{attachment_type}_file_name"]
].join
{
io: open(attachment_url),
filename: "#{upload.id}_#{upload["#{attachment_type}_file_name"]}",
content_type: upload["#{attachment_type}_content_type"]
}
end
And what is really a mystic. When I try to call a differen model, for instance, like User. And even if it does nothing, the code above won't work. Only 1 record will'be updated.