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Turn a model class or model reference string and return a model tuple.
app_label and model_name are used to resolve the scope of recursive and
unscoped model relationship.
NzMapp_label and model_name must be provided to resolve recursive relationships.�.� zCapp_label must be provided to resolve unscoped model relationships.) �
isinstance�strr � TypeError�split�lower�_meta� app_label�
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Return either False or a FieldReference if `field` references provided
context.
False positives can be returned if `reference_field_name` is provided
without `reference_field` because of the introspection limitation it
incurs. This should not be an issue when this function is used to determine
whether or not an optimization can take place.
FN� to_fields�through)� remote_fieldr r �getattr� primary_key�through_fieldsr ) � model_tuple�field�reference_model_tuple�reference_field_name�reference_fieldr �
references_to�references_throughr r r s r �field_referencesr# $ s � � �%�L� � ��u��M� ��� �*�9�[�9�9�9�=R�R�R��E�;��5�5� � � (� � �
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Generator of (model_state, name, field, reference) referencing
provided context.
If field_tuple is provided only references to this particular field of
model_tuple will be generated.
N)�models�items�fieldsr# )�stater � field_tuple�state_model_tuple� model_state�namer � references r �get_referencesr/ U s� � � � � +0�,�*<�*<�*>�*>� :� :�&��;�&�-�3�3�5�5� :� :�K�D�%�(�):�E�;�]�Q\�]�]�]�I��
:�!�4�� �9�9�9�9�� :�:� :r c �D � t t | ||� � d� � duS )z?Return whether `field_tuple` is referenced by any state models.N)�nextr/ )r) r r* s r �field_is_referencedr2 d s# � � ��u�k�;�?�?�� F� F�d� R�Rr )NN)r$ ) � collectionsr � django.db.models.fields.relatedr r r r# r/ r2 r$ r r �<module>r5 s� �� "� "� "� "� "� "� K� K� K� K� K� K�9� 9� 9� 9�6 �� ,�l�;�;�� �� .=� .=� .=� .=�b :� :� :� :� S� S� S� S� Sr