U 8T_>1@sdZddlZddlZddlZddlZddlmZddlmZm Z ddl m Z ddl m Z ddlmZedd ZGd d d eZGd d d eedZddZGddde jZGdddZGdddZd ddZddZddZGdddZdS)!z Various data structures used in query construction. Factored out from django.db.models.query to avoid making the main module very large and/or so that they can be used by other modules without getting into circular import difficulties. N) namedtupleFieldDoesNotExist FieldError) LOOKUP_SEP)tree)RemovedInDjango40WarningPathInfozGfrom_opts to_opts target_fields join_field m2m direct filtered_relationcs<eZdZeddZddZfddZfddZZS) InvalidQueryTypecCsttfSNrselfr@/tmp/pip-unpacked-wheel-dv63caxw/django/db/models/query_utils.py _subclassesszInvalidQueryType._subclassescCstjdtdddS)Nz\The InvalidQuery exception class is deprecated. Use FieldDoesNotExist or FieldError instead.)category stacklevel)warningswarnrr rrrZ__warns zInvalidQueryType.__warncs |t||jpt|Sr )_InvalidQueryType__warn isinstancersuper__instancecheck__)r instance __class__rrr&sz"InvalidQueryType.__instancecheck__cs |t||jpt|Sr )r issubclassrr__subclasscheck__)r subclassrrrr*sz"InvalidQueryType.__subclasscheck__) __name__ __module__ __qualname__propertyrrrr __classcell__rrrrr s   r c@s eZdZdS) InvalidQueryN)r r!r"rrrrr%/sr%) metaclassccs&|V|D]}t|EdHqdSr )__subclasses__ subclassesclsrrrrr(3s r(csjeZdZdZdZdZeZdZdddfdd Zd d Z d d Z ddZ ddZ dddZ ddZZS)Qze Encapsulate filters as objects that can then be combined logically (using `&` and `|`). ANDORTNF) _connector_negatedcs"tj|t|||ddS)N)children connectornegated)r__init__sorteditems)r r.r/argskwargsrrrr3Dsz Q.__init__cCsZt|tst||s t|S|s.t|St|}||_|||||||Sr )rr+ TypeErrorcopydeepcopytyper1add)r otherconnobjrrr_combineGs      z Q._combinecCs|||jSr )r@r-r r=rrr__or__XszQ.__or__cCs|||jSr )r@r,rArrr__and__[sz Q.__and__cCs$t|}|||j||Sr )r;r<r,negate)r r?rrr __invert__^s z Q.__invert__cCs&|j|||ddd\}}|||S)NF) allow_joinsZ split_subqZcheck_filterable)Z_add_qZ promote_joins)r queryrFreuseZ summarizeZfor_saveZclauseZjoinsrrrresolve_expressionds  zQ.resolve_expressioncCsd|jj|jjf}|dr*|dd}di}}t|jdkrnt|jdtsn|jd}|d|di}n t |j}|j |j krd|j i}|j rd|d <|||fS) Nz%s.%szdjango.db.models.query_utilszdjango.db.modelsrrr.Tr/) rr!r startswithreplacelenr0rr+tupler1defaultr2)r pathr6r7childrrr deconstructns       z Q.deconstruct)NTNFF)r r!r"__doc__r,r-rOZ conditionalr3r@rBrCrErIrRr$rrrrr+9s r+c@s*eZdZdZddZd ddZddZdS) DeferredAttributez A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed. cCs ||_dSr )field)r rUrrrr3szDeferredAttribute.__init__NcCs\|dkr |S|j}|jj}||krT||}|dkrL|j|gdt||}|||<||S)zx Retrieve and caches the value from the datastore on the first lookup. Return the cached value. N)fields)__dict__rUattname_check_parent_chainZrefresh_from_dbgetattr)r rr*data field_namevalrrr__get__s  zDeferredAttribute.__get__cCs6|j}||jj}|jjr2|j|kr2t||jSdS)z Check if the field value can be fetched from a parent field already loaded in the instance. This can be done if the to-be fetched field is a primary key field. N)_metaZget_ancestor_linkrUmodel primary_keyrZrX)r roptsZ link_fieldrrrrYs  z%DeferredAttribute._check_parent_chain)N)r r!r"rSr3r^rYrrrrrTs rTc@steZdZeddZeejddddZddZd d Z e d d Z ed dZ edddZ edddZdS)RegisterLookupMixincCs||dSr ) get_lookupsget)r* lookup_namerrr _get_lookupszRegisterLookupMixin._get_lookupN)maxsizecCsddt|D}||S)NcSsg|]}|jdiqS) class_lookups)rWre).0parentrrr sz3RegisterLookupMixin.get_lookups..)inspectgetmro merge_dicts)r*rirrrrdszRegisterLookupMixin.get_lookupscCsNddlm}||}|dkr4t|dr4|j|S|dk rJt||sJdS|S)Nr)Lookup output_field)django.db.models.lookupsrprghasattrrq get_lookupr)r rfrpfoundrrrrts   zRegisterLookupMixin.get_lookupcCsNddlm}||}|dkr4t|dr4|j|S|dk rJt||sJdS|S)Nr) Transformrq)rrrvrgrsrq get_transformr)r rfrvrurrrrws   z!RegisterLookupMixin.get_transformcCs i}t|D]}||q |S)z Merge dicts in reverse to preference the order of the original list. e.g., merge_dicts([a, b]) will preference the keys in 'a' over those in 'b'. )reversedupdate)Zdictsmergeddrrrros  zRegisterLookupMixin.merge_dictscCst|D]}|jqdSr )r(rd cache_clearr)rrr_clear_cached_lookupss z)RegisterLookupMixin._clear_cached_lookupscCs4|dkr|j}d|jkri|_||j|<||S)Nri)rfrWrir}r*lookuprfrrrregister_lookups  z#RegisterLookupMixin.register_lookupcCs|dkr|j}|j|=dS)zn Remove given lookup from cls lookups. For use in tests only as it's not thread-safe. N)rfrir~rrr_unregister_lookupsz&RegisterLookupMixin._unregister_lookup)N)N)r r!r" classmethodrg functools lru_cacherdrtrw staticmethodror}rrrrrrrcs        rcFcCs|js dS|jjr|sdS|rD|r2||kr2dS|sD|j|krDdS|sR|jrRdS|r|j|kr|r|j|krd|jjj|jf}t |dS)au Return True if this field should be used to descend deeper for select_related() purposes. Used by both the query construction code (sql.query.fill_related_selections()) and the model instance creation code (query.get_klass_info()). Arguments: * field - the field to be checked * restricted - a boolean field, indicating if the field list has been manually restricted using a requested clause) * requested - The select_related() dictionary. * load_fields - the set of fields to be loaded on this model * reverse - boolean, True if we are checking a reverse select related FzXField %s.%s cannot be both deferred and traversed using select_related at the same time.T) Z remote_fieldZ parent_linkZrelated_query_namenamenullrXr`r_Z object_namer)rUZ restricted requestedZ load_fieldsreversemsgrrrselect_related_descends&   rcCsVtdt|dD]>}t|d|}||kr||r||||dfSqdS)z Check if the lookup_parts contains references to the given annotations set. Because the LOOKUP_SEP is contained in the default annotation names, check each prefix of the lookup_parts for a match. rJrN)Fr)rangerMrjoin)Z lookup_parts annotationsnZlevel_n_lookuprrrrefs_expressions rcs,fdd}||p*t|ddo*||jjS)z Check that self.model is compatible with target_opts. Compatibility is OK if: 1) model and opts match (where proxy inheritance is removed) 2) model is parent of opts' model or the other way around cs*jj|jkp(|jjkp(|kSr )r_Zconcrete_modelZget_parent_list)rbr`rrcheck#s  z-check_rel_lookup_compatibility..checkraF)rZr`r_)r`Z target_optsrUrrrrcheck_rel_lookup_compatibilitys rc@s@eZdZdZedddZddZddZd d Zd d Z d S)FilteredRelationz7Specify custom filtering in the ON clause of SQL joins. conditioncCs:|s td||_d|_t|ts*td||_g|_dS)Nzrelation_name cannot be empty.z*condition argument must be a Q() instance.) ValueError relation_namealiasrr+rrP)r rrrrrr3;s zFilteredRelation.__init__cCs4t||jstS|j|jko2|j|jko2|j|jkSr )rrNotImplementedrrrrArrr__eq__Es    zFilteredRelation.__eq__cCs,t|j|jd}|j|_|jdd|_|S)Nr)rrrrrP)r clonerrrrNszFilteredRelation.clonecOs tddS)zz QuerySet.annotate() only accepts expression-like arguments (with a resolve_expression() method). z0FilteredRelation.resolve_expression() is unused.N)NotImplementedError)r r6r7rrrrITsz#FilteredRelation.resolve_expressioncCs&|j}|j|jt|jd}||S)N)rH)rGZbuild_filtered_relation_qrsetrPcompile)r compiler connectionrGwhererrras_sql[szFilteredRelation.as_sqlN) r r!r"rSr+r3rrrIrrrrrr8s   r)F)rSr9rrmr collectionsrZdjango.core.exceptionsrrZdjango.db.models.constantsrZ django.utilsrZdjango.utils.deprecationrr r;r Exceptionr%r(Noder+rTrcrrrrrrrrs(     F(C %