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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. NTr#)startF)options stream_classr4Zselected_fieldsr6r7progress_classstart_serializationfirst enumerate start_object_metaconcrete_modelr remote_fieldZ parent_linkZ local_fields serializeattname handle_fieldhandle_fk_fieldZlocal_many_to_manyhandle_m2m_field end_objectr2end_serializationgetvalue)rZquerysetr4r5r6r7r8r9r< progress_barr.objrDrZ pk_parentfieldr r r rFKsD          zSerializer.serializecCtd)zA Called when serializing of the queryset starts. zDsubclasses of Serializer must provide a start_serialization() methodNotImplementedErrorrr r r r?yzSerializer.start_serializationcCdS)z? Called when serializing of the queryset ends. 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