The _compute_permissions helper function has been simplified by delegating the complex permission calculation logic to a new channel.permissions_for(member) method.
This refactoring encapsulates the permission logic within the Channel model, where it belongs. It removes duplicate and complex code from the command decorator, improving maintainability and separation of concerns.
The tests for requires_permissions have been updated to mock the new permissions_for method, resulting in cleaner tests that are no longer concerned with the internal implementation details of how permissions are calculated.
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