a Šxdµã@sLddlmZddlmZddd„ZeddƒZddd „Zdd d „Zd d„ZdS)é)Ú namedtuple)ÚRECURSIVE_RELATIONSHIP_CONSTANTNcCszt|tƒrj|tkr2|dus"|dur*tdƒ‚||fSd|vrNt| ¡ dd¡ƒS|dur^tdƒ‚|| ¡fS|jj|jj fS)z¾ 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.Ú.ézCapp_label must be provided to resolve unscoped model relationships.) Ú isinstanceÚstrrÚ TypeErrorÚtupleÚlowerÚsplitZ_metaÚ app_labelÚ model_name)Úmodelr r ©rú]/var/www/html/Ranjet/env/lib/python3.9/site-packages/django/db/migrations/operations/utils.pyÚresolve_relations ÿÿ rÚFieldReferencez to throughc CsÎ|j}|sdSd}d}t|jg|¢RŽ|krnt|ddƒ}|dusf|dusfd|vr^|dusf|jsf||vrn||f}t|ddƒ} | r¸t| g|¢RŽ|kr¸|j} |dus°| dus°|| vr¸|| f}|sÄ|sÄdSt||ƒS)at 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. FNÚ to_fieldsÚthrough)Ú remote_fieldrrÚgetattrZ primary_keyÚthrough_fieldsr) Ú model_tupleÚfieldZreference_model_tupleZreference_field_nameZreference_fieldrZ references_toZreferences_throughrrrrrrÚfield_references#sB ÿýûûûù  ÿýûrrccsR|j ¡D]B\}}|j ¡D].\}}t|||g|¢RŽ}|r||||fVqq dS)zÍ 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)ÚmodelsÚitemsÚfieldsr)ÚstaterÚ field_tupleZstate_model_tupleZ model_stateÚnamerÚ referencerrrÚget_referencesTs r"cCstt|||ƒdƒduS)z?Return whether `field_tuple` is referenced by any state models.N)Únextr")rrrrrrÚfield_is_referencedcsr$)NN)NN)r) Ú collectionsrZdjango.db.models.fields.relatedrrrrr"r$rrrrÚs    û 1