*`config.active_storage.replace_on_assign_to_many` determines whether assigning to a collection of attachments declared with `has_many_attached` replaces any existing attachments or appends to them. The default is `true`.
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### Results of `load_defaults`
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*`config.active_storage.draw_routes` can be used to toggle Active Storage route generation. The default is `true`.
`config.load_defaults` sets new defaults up to and including the version passed. Such that passing, say, '6.0' also gets the new defaults from every version before it.
Just about every Rails application will interact with a database. You can connect to the database by setting an environment variable `ENV['DATABASE_URL']` or by using a configuration file called `config/database.yml`.
# Loads default configurations. See {the result of the method for each version}[https://guides.rubyonrails.org/configuring.html#results-of-config-load-defaults].