Is there a way to avoid automatically updating Rails timestamp fields?

by

Do this in a migration or in a rake task (or in the new database seeds if you’re on edge rails):

ActiveRecord::Base.record_timestamps = false
begin
  run_the_code_that_imports_the_data
ensure
  ActiveRecord::Base.record_timestamps = true  # don't forget to enable it again!
end

You can safely set created_at and updated_at manually, Rails won’t complain.

Note:
This also works on individual models, e.g.
User.record_timestamps = false

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