ActiveStorage Blobs table, possible to ignore column?

Question

I'm doing a Rails 6.1 upgrade at the moment and wondering if there's a way to set the new service_name column to be ignored. I know how to do this with an ActiveRecord table, but not a Rails' internal table (not sure what to call it).

So above details aside, how does one set a column in the active_storage_blobs table to be ignored?

You would do it by monkeypatching the ActiveStorage::Blob class, but why do you think its necissary in the first place? — max
– max, Commented Nov 5, 2021 at 14:10
yeah, I'd rather not for sure, but, I operate in a busy application that doesn't want to experience down time to do this upgrade. The changes required for ActiveStorage Blobs in 6.1 are a bit of lock step issue. In 6.1 ActiveStorage Blob requires service_name. Ideally I'd be able to backport the change (i.e., run the migration in 6.0), and then I don't have to lock the database/have downtime for the period of the upgrade and migration. However in 6.0 doing this migration doesn't work unless I can ignore the column. Could monkeypatch, I'll look into it. Was hoping for an easy "Rails way" — cdmo
– cdmo, Commented Nov 5, 2021 at 14:40

cdmo · Accepted Answer · 2021-11-05 20:05:08Z

1

# app/initializers/active_storage_ignore_service_name_backport.rb

module ActiveStorageIgnoreServiceNameBackport
  extend ActiveSupport::Concern

  included do
    ignored_columns = [:service_name]
  end
end

Rails.configuration.to_prepare do
  ActiveStorage::Blob.include(ActiveStorageIgnoreServiceNameBackport)
end

answered Nov 5, 2021 at 20:05

cdmo

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