ó ®â0_c@s dZddlmZddlZddlmZddlmZddlm Z ddl m Z edd ƒZ d e fd „ƒYZd „Zd efd„ƒYZde jfd„ƒYZdefd„ƒYZdefd„ƒYZed„Zd„Zd„ZdS(uî 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. iÿÿÿÿ(tunicode_literalsN(t namedtuple(t LOOKUP_SEP(ttree(t lru_cacheuPathInfou5from_opts to_opts target_fields join_field m2m directt InvalidQuerycBseZdZRS(uE The query passed to raw isn't a safe query to use with raw. (t__name__t __module__t__doc__(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRsccs<|Vx0|jƒD]"}xt|ƒD] }|Vq%WqWdS(N(t__subclasses__t subclasses(tclstsubclasstitem((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR st QueryWrappercBs,eZdZeZd„Zddd„ZRS(u¢ A type that indicates the contents are an SQL fragment and the associate parameters. Can be used to pass opaque data to a where-clause, for example. cCs|t|ƒf|_dS(N(tlisttdata(tselftsqltparams((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt__init__.scCs|jS(N(R(Rtcompilert connection((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytas_sql1sN(RRRtFalsetcontains_aggregateRtNoneR(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR's tQcBseeZdZdZdZeZd„Zd„Zd„Zd„Z d„Z d e d e e d„ZRS( uf Encapsulates filters as objects that can then be combined logically (using `&` and `|`). uANDuORcOs3tt|ƒjdt|ƒt|jƒƒƒdS(Ntchildren(tsuperRRRtitems(Rtargstkwargs((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR?scCsZt|tƒst|ƒ‚nt|ƒƒ}||_|j||ƒ|j||ƒ|S(N(t isinstanceRt TypeErrorttypet connectortadd(Rtothertconntobj((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt_combineBs cCs|j||jƒS(N(R)tOR(RR&((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt__or__KscCs|j||jƒS(N(R)tAND(RR&((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt__and__NscCs0t|ƒƒ}|j||jƒ|jƒ|S(N(R#R%R,tnegate(RR(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt __invert__Qs cCs5|j||d|dtƒ\}}|j|ƒ|S(Nt allow_joinst split_subq(t_add_qRt promote_joins(RtqueryR0treuset summarizetfor_savetclausetjoins((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytresolve_expressionWs$ N(RRRR,R*tdefaultRR)R+R-R/RtTrueRR:(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR5s    tDeferredAttributecBs,eZdZd„Zdd„Zd„ZRS(u„ A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed. cCs ||_dS(N(t field_name(RR>tmodel((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRdscCs›|dkr|S|j}|j|j|ƒ|kr|j||jƒ}|dkr€|jd|jgƒt||jƒ}n|||jt_check_parent_chaintrefresh_from_dbtgetattr(RtinstanceR Rtval((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt__get__gs   cCsS|j}|j|ƒ}|j|jƒ}|jrO||krOt||jƒSdS(uÁ 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(t_metat get_fieldtget_ancestor_linkR?t primary_keyREtattnameR(RRFtnametoptstft link_field((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRCys  N(RRRRRRHRC(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR=_s  tRegisterLookupMixincBs‰eZed„ƒZeedd ƒd„ƒƒZd„Zd„Ze d„ƒZ ed„ƒZ ed d„ƒZ ed d„ƒZ RS( cCs|jƒj|dƒS(N(t get_lookupsRBR(R t lookup_name((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt _get_lookup‰stmaxsizecCs>gtj|ƒD]}|jjdiƒ^q}|j|ƒS(Nu class_lookups(tinspecttgetmroRARBt merge_dicts(R tparentt class_lookups((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRSs1cCsnddlm}|j|ƒ}|dkrJt|dƒrJ|jj|ƒS|dk rjt||ƒ rjdS|S(Niÿÿÿÿ(tLookupu output_field(tdjango.db.models.lookupsR\RURthasattrt output_fieldt get_lookupt issubclass(RRTR\tfound((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyR`“scCsnddlm}|j|ƒ}|dkrJt|dƒrJ|jj|ƒS|dk rjt||ƒ rjdS|S(Niÿÿÿÿ(t Transformu output_field(R]RcRURR^R_t get_transformRa(RRTRcRb((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRdœscCs.i}x!t|ƒD]}|j|ƒqW|S(u« 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'. (treversedtupdate(tdictstmergedtd((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRY¥scCs(x!t|ƒD]}|jjƒq WdS(N(R RSt cache_clear(R R ((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt_clear_cached_lookups°scCsN|dkr|j}nd|jkr3i|_n||j|<|jƒ|S(Nu class_lookups(RRTRAR[Rk(R tlookupRT((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytregister_lookupµs     cCs&|dkr|j}n|j|=dS(un Remove given lookup from cls lookups. For use in tests only as it's not thread-safe. N(RRTR[(R RlRT((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyt_unregister_lookup¿s  N(RRt classmethodRURRRSR`Rdt staticmethodRYRkRmRn(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyRR‡s   cCsÐ|js tS|jjr$| r$tS|rc|rF|jƒ|krFtS| rc|j|krctSn| rw|jrwtS|rÌ|j|krÌ|rÉ|j|krÉtd|jj j |jfƒ‚qÉqÌnt S(uv Returns 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 uXField %s.%s cannot be both deferred and traversed using select_related at the same time.( t remote_fieldRt parent_linktrelated_query_nameRNtnullRMRR?RIt object_nameR<(tfieldt restrictedt requestedt load_fieldstreverse((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytselect_related_descendÊs" %cCsix\tt|ƒdƒD]D}tj|d|!ƒ}||kr||r||||fSqWtdfS(uó A helper method to check if the lookup_parts contains references to the given annotations set. Because the LOOKUP_SEP is contained in the default annotation names we must check each prefix of the lookup_parts for a match. ii((trangetlenRtjoinR(t lookup_partst annotationstntlevel_n_lookup((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytrefs_expressionîs cs=‡fd†}||ƒp<t|dtƒo<||jjƒS(uÞ 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=ˆjj|jkp<|jˆjjƒkp<ˆ|jƒkS(N(RItconcrete_modeltget_parent_list(RO(R?(s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytchecksu primary_key(RERR?RI(R?t target_optsRvR†((R?s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pytcheck_rel_lookup_compatibilityüs (Rt __future__RRWt collectionsRtdjango.db.models.constantsRt django.utilsRtdjango.utils.lru_cacheRtPathInfot ExceptionRR tobjectRtNodeRR=RRRR{RƒRˆ(((s>/tmp/pip-unpacked-wheel-BAJOf3/django/db/models/query_utils.pyts   *(C $