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c C sZ t i t | ƒ d ƒ d j o7 | i o t p t } t i ƒ i | | | ƒ ƒ n d S( s: Join a session to a transaction using the appropriate datamanager.
It is safe to call this multiple times, if the session is already joined
then it just returns.
`initial_state` is either STATUS_ACTIVE, STATUS_INVALIDATED or STATUS_READONLY
If using the default initial status of STATUS_ACTIVE, you must ensure that
dirty_session(session) is called when data is written to the database.
The DirtyAfterFlush SessionExtension can be used to ensure that this is
called automatically after session write operations.
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