o ןi1@sddlZddlZddlmZddlmZeddZeedZ GdddZ d d Z dd d Z  dd dZ dddZddZdS)N) namedtuple)RECURSIVE_RELATIONSHIP_CONSTANTFieldReferencez to throughc@seZdZddZddZdS) RegexObjectcCs|j|_|j|_dSN)patternflags)selfobjr dC:\Users\psant\Downloads\Anu Raj Backend\school\venv\Lib\site-packages\django/db/migrations/utils.py__init__ s zRegexObject.__init__cCs&t|tstS|j|jko|j|jkSr) isinstancerNotImplementedrr )r otherr r r __eq__s zRegexObject.__eq__N)__name__ __module__ __qualname__rrr r r r r s rcCstjdS)Nz %Y%m%d_%H%M)datetimenowstrftimer r r r get_migration_name_timestampsrcCst|tr9|tkr|dus|durtd||fSd|vr+|dd\}}||fS|dur3td||fS|jj|jjfS)z 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.) rstrr TypeErrorsplitlowerZ_meta app_label model_name)modelr r!r r r resolve_relations   r#c Cs|j}|sdSd}d}t|jg|R|kr7t|dd}|dus3|dus3d|vr/|dus3|js3||vr7||f}t|dd} | r\t| g|R|kr\|j} |dusX| dusX|| vr\|| f}|sb|sbdSt||S)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. FN to_fieldsthrough) remote_fieldr#r"getattrZ primary_keythrough_fieldsr) model_tuplefieldZreference_model_tupleZreference_field_nameZreference_fieldr&Z references_toZreferences_throughr$r%r(r r r field_references5sB       r+r ccsT|jD]!\}}|jD]\}}t|||g|R}|r&||||fVqqdS)z 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)modelsitemsfieldsr+)stater) field_tupleZstate_model_tupleZ model_statenamer* referencer r r get_referencesnsr3cCstt|||dduS)z?Return whether `field_tuple` is referenced by any state models.N)nextr3)r/r)r0r r r field_is_referencedsr5)NN)r )rre collectionsrZdjango.db.models.fields.relatedrrtypecompileZCOMPILED_REGEX_TYPErrr#r+r3r5r r r r s     9