This check is true if the access is coming from a relationship load.

This check allows resources to be accessed through relationship loads from other resources, without creating hard dependencies. It simply checks if Ash's accessing_from context is present, which indicates the access is happening through a relationship load.

Usage in policies

policies do
  bypass ExtensionInteraction do
    authorize_if always()
  end
end

This pattern allows any resource to load related data through relationships while maintaining proper authorization boundaries. The check doesn't distinguish between "core" and "extension" resources - it simply allows relationship-based access.

How it works

When Ash loads a relationship (e.g., Blogger.user), it automatically sets accessing_from: %{name: :user, source: MishkaBlog.Blogger} in the query context. This check detects that context and grants access.