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Add ActiveModel requirement to application.rb
Currently, ActiveModel is only loaded by ActiveRecord. If you skip ActiveRecord, ActiveModel will not be required (or even autoloaded) and including `ActiveModel::Model` into a plain Ruby class will raise `NameError`. To reproduce this: - create a new app with `rails new my_app -O` - create a Ruby class that includes `ActiveModel::Model` in `app/models` - load up a Rails console and try to do anything with the class :-) Since ActionPack relies so heavily on the ActiveModel API, this should probably be considered a dependency of the app. Another possibility would be to make it a dependency of ActionController.
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