It is an enhancement of the existing a4 Poll module, which was accessible only to registered users.
The open poll allows access to unregister users by a checkbox in the project dashboard poll module. For this enhance feature, we decoupled the creator from the poll's answers and votes. The new class GeneratedContentModel - see file adhocracy4/models/base.py has the creator relation as optional, and introduces the new field/colum content_id to provide a unique ID for counting poll's answers and votes in case there is no creator.
Answers and Votes classes are updated and now they inherit from the new GeneratedContentModel. Answer has now as unique together question, creator, content_id depending on whether creator or content_id field exist.
Permissions allows_unregistered_users are now also in place for enabling those unregistered users to interact with the open poll in the - see the file adhocracy4/polls/predicates.py.
For submitting the open poll, we provide a checkbox for agreed_terms_of_use of the project same as for registered users at the end of the poll, along with a captcha written in React to filter out robots and spam.
The open poll is intended for public projects only. Private and semi-private projects require a user account to interact with by design, thus the allow_unregistered_users has no effect for them.
At the moment, project insights are not counting unregistered users.