ó ø¢TQc@säddlmZddlmZddlmZmZmZddlm Z m Z ddl m Z ddl mZdefd„ƒYZd „Zd „Zd „ZedƒZd „Zd „Zd„Zdefd„ƒYZdS(iÿÿÿÿ(twraps(t attrgetter(t connectionst transactiontIntegrityError(tsignalstsql(t SortedDict(tsixtProtectedErrorcBseZd„ZRS(cCs&||_tt|ƒj||ƒdS(N(tprotected_objectstsuperR t__init__(tselftmsgR ((s2../Django//lib/python/django/db/models/deletion.pyR s (t__name__t __module__R (((s2../Django//lib/python/django/db/models/deletion.pyR scCs_|j|d|jjd|jd|jƒ|jr[t|jj r[|j|d|ƒndS(Ntsourcet source_attrtnullable( tcollecttrelttotnametnullRtfeaturestcan_defer_constraint_checkstadd_field_updatetNone(t collectortfieldtsub_objstusing((s2../Django//lib/python/django/db/models/deletion.pytCASCADEscCs6td|jjj|djj|jf|ƒ‚dS(NsoCannot delete some instances of model '%s' because they are referenced through a protected foreign key: '%s.%s'i(R RRRt __class__R(RRRR ((s2../Django//lib/python/django/db/models/deletion.pytPROTECTs#cs1tˆƒr‡fd†}n‡fd†}|S(Ncs|j|ˆƒ|ƒdS(N(R(RRRR (tvalue(s2../Django//lib/python/django/db/models/deletion.pyt set_on_delete"scs|j|ˆ|ƒdS(N(R(RRRR (R$(s2../Django//lib/python/django/db/models/deletion.pyR%%s(tcallable(R$R%((R$s2../Django//lib/python/django/db/models/deletion.pytSET s cCs|j||jƒ|ƒdS(N(Rt get_default(RRRR ((s2../Django//lib/python/django/db/models/deletion.pyt SET_DEFAULT-scCsdS(N((RRRR ((s2../Django//lib/python/django/db/models/deletion.pyt DO_NOTHING1scstˆƒ‡fd†ƒ}|S(Ncsžtjd|jƒs1tjd|jƒt}nt}zCˆ|||Ž|rftjd|jƒntjd|jƒWd|r™tjd|jƒnXdS(NR ( Rt is_managedR tenter_transaction_managementtTruetFalsetcommittcommit_unless_managedtleave_transaction_management(R targstkwargstforced_managed(tfunc(s2../Django//lib/python/django/db/models/deletion.pyt decorated6s (R(R5R6((R5s2../Django//lib/python/django/db/models/deletion.pyt force_managed5st CollectorcBsƒeZd„Zd eed„Zd„Zd„Zd d„Zd ee d ed„Z d„Z d„Z d„Z ed „ƒZRS( cCs:||_i|_i|_i|_g|_i|_dS(N(R tdatatbatchest field_updatest fast_deletest dependencies(R R ((s2../Django//lib/python/django/db/models/deletion.pyR Js      c CsÊ|s gSg}|dj}|jj|tƒƒ}x*|D]"}||kr<|j|ƒq<q<W|j|ƒ|dk rÆ| rÆ|r˜||}}n|jj|jj tƒƒj |jj ƒn|S(s9 Adds 'objs' to the collection of objects to be deleted. If the call is the result of a cascade, 'source' should be the model that caused it, and 'nullable' should be set to True if the relation can be null. Returns a list of all objects that were not already collected. iN( R"R9t setdefaulttsettappendtupdateRR=t_metatconcrete_modeltadd( R tobjsRRtreverse_dependencytnew_objstmodelt instancestobj((s2../Django//lib/python/django/db/models/deletion.pyRD[s     %cCs/|jj|iƒj|tƒƒj|ƒdS(s– Schedules a batch delete. Every instance of 'model' that is related to an instance of 'obj' through 'field' will be deleted. N(R:R>R?RA(R RHRRE((s2../Django//lib/python/django/db/models/deletion.pyt add_batchvscCsL|s dS|dj}|jj|iƒj||ftƒƒj|ƒdS(s‰ Schedules a field update. 'objs' must be a homogenous iterable collection of model instances (e.g. a QuerySet). Ni(R"R;R>R?RA(R RR$RERH((s2../Django//lib/python/django/db/models/deletion.pyR}s    c sˆrˆjjtk rtSt|dƒo7t|dƒs>tS|j}tjj|ƒs}tj j|ƒs}tj j|ƒrtS|j }t ‡fd†|j j jjƒDƒƒr¹tSx9|jdtdtƒD]}|jjjtk rÒtSqÒWx!|jD]}|jjsÿtSqÿWtS(sÀ Determines if the objects in the given queryset-like can be fast-deleted. This can be done if there are no cascades, no parents and no signal listeners for the object class. The 'from_field' tells where we are coming from - we need this to determine if the objects are in fact to be deleted. Allows also skipping parent -> child -> parent chain preventing fast delete of the child. RHt _raw_deletec3s|]}|ˆkVqdS(N((t.0tlink(t from_field(s2../Django//lib/python/django/db/models/deletion.pys  stinclude_hiddentinclude_proxy_eq(Rt on_deleteR!R.thasattrRHRt pre_deletet has_listenerst post_deletet m2m_changedRBtanyRCtparentstvaluestget_all_related_objectsR-RR*t many_to_manytthrough(R RERORHtoptstrelatedtrelation((ROs2../Django//lib/python/django/db/models/deletion.pytcan_fast_delete‰s(   +  c Csí|j|ƒr#|jj|ƒdS|j|||d|ƒ}|sHdS|dj}|jj} xvtj| jj ƒD]_} | rwg|D]} t | | j ƒ^qŠ} |j | d|d| j jdtdtƒqwqwW|réx£|jjdtdtƒD]†} | j}|j jtkr#qün|j| |ƒ}|j|d |ƒr]|jj|ƒqü|rü|j j||||jƒqüqüWx`|jjD]O}|j js“|j||jƒ}|j |d|d|j jd tƒq“q“WndS( s  Adds 'objs' to the collection of objects to be deleted as well as all parent instances. 'objs' must be a homogenous iterable collection of model instances (e.g. a QuerySet). If 'collect_related' is True, related objects will be handled by their respective on_delete handler. If the call is the result of a cascade, 'source' should be the model that caused it and 'nullable' should be set to True, if the relation can be null. If 'reverse_dependency' is True, 'source' will be deleted before the current model, rather than after. (Needed for cascading to parent models, the one case in which the cascade follows the forwards direction of an FK rather than the reverse direction.) NRFiRRtcollect_relatedRPRQROR(RaR<R@RDR"RBRCRt itervaluesRYtgetattrRRRt related_nameR.R-R[RRRR*trelated_objectsR R\R]tbulk_related_objects(R RERRRbRRFRGRHRCtptrRJt parent_objsR_RRR`((s2../Django//lib/python/django/db/models/deletion.pyR®sD   %  #   cCs0|jjj|jƒji|d|jj6S(s_ Gets a QuerySet of objects related to ``objs`` via the relation ``related``. s%s__in(RHt _base_managerR tfilterRR(R R_RE((s2../Django//lib/python/django/db/models/deletion.pyRfðsccsCx<tj|jƒD](\}}x|D]}||fVq&WqWdS(N(Rt iteritemsR9(R RHRIRJ((s2../Django//lib/python/django/db/models/deletion.pytinstances_with_modelùs cCsùg}tƒ}t|jƒ}x¥t|ƒt|ƒkrÅt}xv|D]n}||kr^qFn|jj|jjƒ}|oˆ|j |ƒsF|j |ƒ|j |jjƒt }qFqFW|s!dSq!Wt g|D]}||j|f^qЃ|_dS(N(R?tlistR9tlenR.R=tgetRBRCt differenceR@RDR-R(R t sorted_modelstconcrete_modelstmodelstfoundRHR=((s2../Django//lib/python/django/db/models/deletion.pytsortþs"     c Cs^x<|jjƒD]+\}}t|dtdƒƒ|j|s