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FNr)streamfieldsuse_natural_foreign_keysuse_natural_primary_keysprogress_output object_countcKst||_|dur |n||_||_||_||_|||} |d|_t |ddD]\} } | | | j j } |jrJ| j j } | jrG| jjrG| nd}nd}| j jD]5}|jsY||ur|jdurp|jdusi|j|jvro|| |qP|jdus|jdd|jvr|| |qP| j jD]}|jr|jdus|j|jvr|| |q|| | | |jod|_q*||S)z' Serialize a queryset. NTr1)startF)options stream_classrBselected_fieldsrDrEprogress_classstart_serializationfirst enumerate start_object_metaconcrete_modelr) remote_field parent_link local_fields serializeattname handle_fieldhandle_fk_fieldlocal_many_to_manyhandle_m2m_field end_objectr@end_serializationgetvalue)r querysetrBrCrDrErFrGrJ progress_barr<rrSr) pk_parentfieldr r rrWksL               zSerializer.serializecCtd)zA Called when serializing of the queryset starts. zDsubclasses of Serializer must provide a start_serialization() methodNotImplementedErrorr r r rrNzSerializer.start_serializationcCdS)z? Called when serializing of the queryset ends. 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