1 # -*- coding: utf-8 -*-
4 # Copyright (c) 2009-2010, Bolloré telecom
7 # See AUTHORS file for a full list of contributors.
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21 # without specific prior written permission.
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35 from copy import deepcopy
38 from django.db.models.query import QuerySet as BaseQuerySet
39 from django.db.models.query_utils import Q
40 from django.db.models.sql import Query as BaseQuery
41 from django.db.models.sql.where import WhereNode as BaseWhereNode, Constraint as BaseConstraint, AND, OR
44 from ldapdb.backends.ldap import compiler
45 from ldapdb.models.fields import CharField
47 class Constraint(BaseConstraint):
49 An object that can be passed to WhereNode.add() and knows how to
50 pre-process itself prior to including in the WhereNode.
53 - we redefine this class, because when self.field is None calls
54 Field().get_db_prep_lookup(), which short-circuits our LDAP-specific code.
56 def process(self, lookup_type, value, connection):
58 Returns a tuple of data suitable for inclusion in a WhereNode
61 # Because of circular imports, we need to import this here.
62 from django.db.models.base import ObjectDoesNotExist
66 params = self.field.get_db_prep_lookup(lookup_type, value,
67 connection=connection, prepared=True)
68 db_type = self.field.db_type()
70 params = CharField().get_db_prep_lookup(lookup_type, value,
71 connection=connection, prepared=True)
73 except ObjectDoesNotExist:
74 raise EmptyShortCircuit
76 return (self.alias, self.col, db_type), params
78 class WhereNode(BaseWhereNode):
79 def add(self, data, connector):
80 if not isinstance(data, (list, tuple)):
81 super(WhereNode, self).add(data, connector)
84 # we replace the native Constraint by our own
85 obj, lookup_type, value = data
86 if hasattr(obj, "process"):
87 obj = Constraint(obj.alias, obj.col, obj.field)
88 super(WhereNode, self).add((obj, lookup_type, value), connector)
90 class Query(BaseQuery):
91 def get_count(self, using):
93 vals = ldapdb.connection.search_s(
95 self.model.search_scope,
96 filterstr=compiler.query_as_ldap(self),
99 except ldap.NO_SUCH_OBJECT:
104 # apply limit and offset
105 number = max(0, number - self.low_mark)
106 if self.high_mark is not None:
107 number = min(number, self.high_mark - self.low_mark)
111 def get_compiler(self, using=None, connection=None):
112 return super(Query, self).get_compiler(connection=ldapdb.connection)
114 def has_results(self, using):
115 return self.get_count(using) != 0
117 class QuerySet(BaseQuerySet):
118 def __init__(self, model=None, query=None, using=None):
120 query = Query(model, WhereNode)
121 super(QuerySet, self).__init__(model=model, query=query, using=using)
126 vals = ldapdb.connection.search_s(
128 self.model.search_scope,
129 filterstr=compiler.query_as_ldap(self.query),
132 except ldap.NO_SUCH_OBJECT:
135 # FIXME : there is probably a more efficient way to do this
136 for dn, attrs in vals:
137 ldapdb.connection.delete_s(dn)