Switch branches/tags
Find file Copy path
339 lines (288 sloc) 12 KB
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.
import copy
import functools
import inspect
from collections import namedtuple
from django.db.models.constants import LOOKUP_SEP
from django.utils import tree
# PathInfo is used when converting lookups (fk__somecol). The contents
# describe the relation in Model terms (model Options and Fields for both
# sides of the relation. The join_field is the field backing the relation.
PathInfo = namedtuple('PathInfo', 'from_opts to_opts target_fields join_field m2m direct filtered_relation')
class InvalidQuery(Exception):
"""The query passed to raw() isn't a safe query to use with raw()."""
def subclasses(cls):
yield cls
for subclass in cls.__subclasses__():
yield from subclasses(subclass)
class QueryWrapper:
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.
contains_aggregate = False
def __init__(self, sql, params): = sql, list(params)
def as_sql(self, compiler=None, connection=None):
class Q(tree.Node):
Encapsulate filters as objects that can then be combined logically (using
`&` and `|`).
# Connection types
OR = 'OR'
default = AND
conditional = True
def __init__(self, *args, **kwargs):
connector = kwargs.pop('_connector', None)
negated = kwargs.pop('_negated', False)
super().__init__(children=list(args) + sorted(kwargs.items()), connector=connector, negated=negated)
def _combine(self, other, conn):
if not isinstance(other, Q):
raise TypeError(other)
# If the other Q() is empty, ignore it and just use `self`.
if not other:
return copy.deepcopy(self)
# Or if this Q is empty, ignore it and just use `other`.
elif not self:
return copy.deepcopy(other)
obj = type(self)()
obj.connector = conn
obj.add(self, conn)
obj.add(other, conn)
return obj
def __or__(self, other):
return self._combine(other, self.OR)
def __and__(self, other):
return self._combine(other, self.AND)
def __invert__(self):
obj = type(self)()
obj.add(self, self.AND)
return obj
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
# We must promote any new joins to left outer joins so that when Q is
# used as an expression, rows aren't filtered due to joins.
clause, joins = query._add_q(self, reuse, allow_joins=allow_joins, split_subq=False)
return clause
def deconstruct(self):
path = '%s.%s' % (self.__class__.__module__, self.__class__.__name__)
if path.startswith('django.db.models.query_utils'):
path = path.replace('django.db.models.query_utils', 'django.db.models')
args, kwargs = (), {}
if len(self.children) == 1 and not isinstance(self.children[0], Q):
child = self.children[0]
kwargs = {child[0]: child[1]}
args = tuple(self.children)
if self.connector != self.default:
kwargs = {'_connector': self.connector}
if self.negated:
kwargs['_negated'] = True
return path, args, kwargs
class DeferredAttribute:
A wrapper for a deferred-loading field. When the value is read from this
object the first time, the query is executed.
def __init__(self, field_name):
self.field_name = field_name
def __get__(self, instance, cls=None):
Retrieve and caches the value from the datastore on the first lookup.
Return the cached value.
if instance is None:
return self
data = instance.__dict__
if data.get(self.field_name, self) is self:
# Let's see if the field is part of the parent chain. If so we
# might be able to reuse the already loaded value. Refs #18343.
val = self._check_parent_chain(instance, self.field_name)
if val is None:
val = getattr(instance, self.field_name)
data[self.field_name] = val
return data[self.field_name]
def _check_parent_chain(self, instance, name):
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.
opts = instance._meta
f = opts.get_field(name)
link_field = opts.get_ancestor_link(f.model)
if f.primary_key and f != link_field:
return getattr(instance, link_field.attname)
return None
class RegisterLookupMixin:
def _get_lookup(cls, lookup_name):
return cls.get_lookups().get(lookup_name, None)
def get_lookups(cls):
class_lookups = [parent.__dict__.get('class_lookups', {}) for parent in inspect.getmro(cls)]
return cls.merge_dicts(class_lookups)
def get_lookup(self, lookup_name):
from django.db.models.lookups import Lookup
found = self._get_lookup(lookup_name)
if found is None and hasattr(self, 'output_field'):
return self.output_field.get_lookup(lookup_name)
if found is not None and not issubclass(found, Lookup):
return None
return found
def get_transform(self, lookup_name):
from django.db.models.lookups import Transform
found = self._get_lookup(lookup_name)
if found is None and hasattr(self, 'output_field'):
return self.output_field.get_transform(lookup_name)
if found is not None and not issubclass(found, Transform):
return None
return found
def merge_dicts(dicts):
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'.
merged = {}
for d in reversed(dicts):
return merged
def _clear_cached_lookups(cls):
for subclass in subclasses(cls):
def register_lookup(cls, lookup, lookup_name=None):
if lookup_name is None:
lookup_name = lookup.lookup_name
if 'class_lookups' not in cls.__dict__:
cls.class_lookups = {}
cls.class_lookups[lookup_name] = lookup
return lookup
def _unregister_lookup(cls, lookup, lookup_name=None):
Remove given lookup from cls lookups. For use in tests only as it's
not thread-safe.
if lookup_name is None:
lookup_name = lookup.lookup_name
del cls.class_lookups[lookup_name]
def select_related_descend(field, restricted, requested, load_fields, reverse=False):
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
* 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
if not field.remote_field:
return False
if field.remote_field.parent_link and not reverse:
return False
if restricted:
if reverse and field.related_query_name() not in requested:
return False
if not reverse and not in requested:
return False
if not restricted and field.null:
return False
if load_fields:
if field.attname not in load_fields:
if restricted and in requested:
raise InvalidQuery("Field %s.%s cannot be both deferred"
" and traversed using select_related"
" at the same time." %
return True
def refs_expression(lookup_parts, annotations):
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.
for n in range(1, len(lookup_parts) + 1):
level_n_lookup = LOOKUP_SEP.join(lookup_parts[0:n])
if level_n_lookup in annotations and annotations[level_n_lookup]:
return annotations[level_n_lookup], lookup_parts[n:]
return False, ()
def check_rel_lookup_compatibility(model, target_opts, field):
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
def check(opts):
return (
model._meta.concrete_model == opts.concrete_model or
opts.concrete_model in model._meta.get_parent_list() or
model in opts.get_parent_list()
# If the field is a primary key, then doing a query against the field's
# model is ok, too. Consider the case:
# class Restaurant(models.Model):
# place = OnetoOneField(Place, primary_key=True):
# Restaurant.objects.filter(pk__in=Restaurant.objects.all()).
# If we didn't have the primary key check, then pk__in (== place__in) would
# give Place's opts as the target opts, but Restaurant isn't compatible
# with that. This logic applies only to primary keys, as when doing __in=qs,
# we are going to turn this into __in=qs.values('pk') later on.
return (
check(target_opts) or
(getattr(field, 'primary_key', False) and check(field.model._meta))
class FilteredRelation:
"""Specify custom filtering in the ON clause of SQL joins."""
def __init__(self, relation_name, *, condition=Q()):
if not relation_name:
raise ValueError('relation_name cannot be empty.')
self.relation_name = relation_name
self.alias = None
if not isinstance(condition, Q):
raise ValueError('condition argument must be a Q() instance.')
self.condition = condition
self.path = []
def __eq__(self, other):
return (
isinstance(other, self.__class__) and
self.relation_name == other.relation_name and
self.alias == other.alias and
self.condition == other.condition
def clone(self):
clone = FilteredRelation(self.relation_name, condition=self.condition)
clone.alias = self.alias
clone.path = self.path[:]
return clone
def resolve_expression(self, *args, **kwargs):
QuerySet.annotate() only accepts expression-like arguments
(with a resolve_expression() method).
raise NotImplementedError('FilteredRelation.resolve_expression() is unused.')
def as_sql(self, compiler, connection):
# Resolve the condition in Join.filtered_relation.
query = compiler.query
where = query.build_filtered_relation_q(self.condition, reuse=set(self.path))
return compiler.compile(where)