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module DeclarativePolicy PREFERRED_SCOPE_KEY = :"DeclarativePolicy.preferred_scope" class << self def with_preferred_scope(scope, &b) Thread.current[PREFERRED_SCOPE_KEY], old_scope = scope, Thread.current[PREFERRED_SCOPE_KEY] yield ensure Thread.current[PREFERRED_SCOPE_KEY] = old_scope end def preferred_scope Thread.current[PREFERRED_SCOPE_KEY] end def user_scope(&b) with_preferred_scope(:user, &b) end def subject_scope(&b) with_preferred_scope(:subject, &b) end def preferred_scope=(scope) Thread.current[PREFERRED_SCOPE_KEY] = scope end end end