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1. active admin, polymorphic drop down active admin, polymorphic drop down

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   # this is a helper method to provide setters for polymorphic relationships in active admin forms

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   # attribute_name: name that record knows polymorphic relationship as

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   # actions: the active record actions that should use this setter, defaults to setter being implemented before create and update

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   def polymorphic_attribute_set(attribute_name, actions: [:before_create, :before_update])

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     klass = config.resource_class

2. Arel Cheatsheet Arel Cheatsheet

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   content copied from [Advanced Arel: When ActiveRecord Just Isn't Enough](https://www.youtube.com/watch?v=ShPAxNcLm3o)

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   further information:

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   - [arel_cheatsheet_on_steroids](https://gist.github.com/ProGM/c6df08da14708dcc28b5ca325df37ceb)

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   - [Rails test examples](https://github.com/rails/rails/blob/main/activerecord/test/cases/arel/select_manager_test.rb)