ó ø¢TQc@sÃdZddlmZddlmZddlmZddlmZdefd„ƒYZ de fd „ƒYZ d ej fd „ƒYZ d e fd „ƒYZed„Zd„Zee_dS(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_literals(tutil(tsix(ttreet InvalidQuerycBseZdZRS(uE The query passed to raw isn't a safe query to use with raw. (t__name__t __module__t__doc__(((s5../Django//lib/python/django/db/models/query_utils.pyRst QueryWrappercBs&eZdZd„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||f|_dS(N(tdata(tselftsqltparams((s5../Django//lib/python/django/db/models/query_utils.pyt__init__scCs|jS(N(R (R tqnt connection((s5../Django//lib/python/django/db/models/query_utils.pytas_sqlsN(RRRR tNoneR(((s5../Django//lib/python/django/db/models/query_utils.pyRs tQcBsMeZdZdZdZeZd„Zd„Zd„Zd„Z d„Z RS(ub Encapsulates filters as objects that can then be combined logically (using & and |). uANDuORcOs6tt|ƒjdt|ƒttj|ƒƒƒdS(Ntchildren(tsuperRR tlistRt iteritems(R targstkwargs((s5../Django//lib/python/django/db/models/query_utils.pyR +scCsQt|tƒst|ƒ‚nt|ƒƒ}|j||ƒ|j||ƒ|S(N(t isinstanceRt TypeErrorttypetadd(R tothertconntobj((s5../Django//lib/python/django/db/models/query_utils.pyt_combine.s cCs|j||jƒS(N(R tOR(R R((s5../Django//lib/python/django/db/models/query_utils.pyt__or__6scCs|j||jƒS(N(R tAND(R R((s5../Django//lib/python/django/db/models/query_utils.pyt__and__9scCs0t|ƒƒ}|j||jƒ|jƒ|S(N(RRR#tnegate(R R((s5../Django//lib/python/django/db/models/query_utils.pyt __invert__<s ( RRRR#R!tdefaultR R R"R$R&(((s5../Django//lib/python/django/db/models/query_utils.pyR!s    tDeferredAttributecBs2eZdZd„Zd„Zd„Zd„ZRS(u„ A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed. cCs ||_dS(N(t field_name(R R)tmodel((s5../Django//lib/python/django/db/models/query_utils.pyR Gsc Cs<ddlm}|jj}|j}|dk s7t‚|j}|j|j|ƒ|kr1y|j |jƒd}WnC|k rºg|j D]}|j |jkr|^qd}nX|j }|j ||ƒ} | dkr!t|jj|ƒj|jjƒjd|jƒ|jƒ} n| ||jtvalue((s5../Django//lib/python/django/db/models/query_utils.pyt__set__mscCsW|j}|j|ƒd}|j|jƒ}|jrS||krSt||jƒSdS(uÁ Check if the field value can be fetched from a parent field already loaded in the instance. This can be done if the to-be fetched field is a primary key field. iN(R.R3tget_ancestor_linkR*t primary_keyR8R5R(R R>R6RARBt link_field((s5../Django//lib/python/django/db/models/query_utils.pyR7ts  (RRRR RDRFR7(((s5../Django//lib/python/django/db/models/query_utils.pyR(Bs   # c CsÑ|js tS|jjr$| r$tS|rc|rF|jƒ|krFtS| rc|j|krctSn| rw|jrwtS|rÍ|j|krÍ|rÆ|j|krÆtd|jjj |jfƒ‚ntSnt S(uv Returns True if this field should be used to descend deeper for select_related() purposes. Used by both the query construction code (sql.query.fill_related_selections()) and the model instance creation code (query.get_klass_info()). Arguments: * field - the field to be checked * restricted - a boolean field, indicating if the field list has been manually restricted using a requested clause) * requested - The select_related() dictionary. * load_fields - the set of fields to be loaded on this model * reverse - boolean, True if we are checking a reverse select related uXField %s.%s cannot be both deferred and traversed using select_related at the same time.( treltFalset parent_linktrelated_query_nameR6tnullRR*R.t object_nametTrue(tfieldt restrictedt requestedt load_fieldstreverse((s5../Django//lib/python/django/db/models/query_utils.pytselect_related_descend‚s$ cs¾dd ‡fd†ƒY}dˆjdjtt|ƒƒƒf}tj|ddƒ}tg|D]}|t|ˆƒf^q`ƒ}||d<ˆj|ds !@ '