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Refs #20880 -- Removed non-cloning logic from QuerySet._clone().
This commit is contained in:
Anssi Kääriäinen
Tim Graham
parent
0baea920c8
commit
66933a6619
@ -261,7 +261,7 @@ class QuerySet:
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return self._result_cache[k]
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if isinstance(k, slice):
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qs = self._clone()
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qs = self._chain()
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if k.start is not None:
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start = int(k.start)
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else:
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@ -273,7 +273,7 @@ class QuerySet:
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qs.query.set_limits(start, stop)
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return list(qs)[::k.step] if k.step else qs
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qs = self._clone()
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qs = self._chain()
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qs.query.set_limits(k, k + 1)
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qs._fetch_all()
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return qs._result_cache[0]
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@ -284,7 +284,7 @@ class QuerySet:
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return other
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if isinstance(self, EmptyQuerySet):
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return self
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combined = self._clone()
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combined = self._chain()
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combined._merge_known_related_objects(other)
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combined.query.combine(other.query, sql.AND)
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return combined
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@ -295,7 +295,7 @@ class QuerySet:
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return other
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if isinstance(other, EmptyQuerySet):
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return self
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combined = self._clone()
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combined = self._chain()
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combined._merge_known_related_objects(other)
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combined.query.combine(other.query, sql.OR)
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return combined
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@ -535,7 +535,7 @@ class QuerySet:
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"field_name parameter or 'get_latest_by' in the model"
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assert self.query.can_filter(), \
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"Cannot change a query once a slice has been taken."
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obj = self._clone()
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obj = self._chain()
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obj.query.set_limits(high=1)
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obj.query.clear_ordering(force_empty=True)
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obj.query.add_ordering('%s%s' % (direction, order_by))
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@ -582,7 +582,7 @@ class QuerySet:
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else:
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qs = self.filter(**{filter_key: id_list}).order_by()
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else:
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qs = self._clone()
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qs = self._chain()
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return {getattr(obj, field_name): obj for obj in qs}
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def delete(self):
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@ -593,7 +593,7 @@ class QuerySet:
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if self._fields is not None:
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raise TypeError("Cannot call delete() after .values() or .values_list()")
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del_query = self._clone()
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del_query = self._chain()
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# The delete is actually 2 queries - one to find related objects,
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# and one to delete. Make sure that the discovery of related
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@ -678,7 +678,7 @@ class QuerySet:
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return RawQuerySet(raw_query, model=self.model, params=params, translations=translations, using=using)
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def _values(self, *fields, **expressions):
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clone = self._clone()
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clone = self._chain()
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if expressions:
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clone = clone.annotate(**expressions)
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clone._fields = fields
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@ -748,7 +748,7 @@ class QuerySet:
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def none(self):
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"""Return an empty QuerySet."""
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clone = self._clone()
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clone = self._chain()
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clone.query.set_empty()
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return clone
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@ -761,7 +761,7 @@ class QuerySet:
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Return a new QuerySet that is a copy of the current one. This allows a
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QuerySet to proxy for a model manager in some cases.
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"""
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return self._clone()
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return self._chain()
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def filter(self, *args, **kwargs):
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"""
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@ -782,7 +782,7 @@ class QuerySet:
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assert self.query.can_filter(), \
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"Cannot filter a query once a slice has been taken."
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clone = self._clone()
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clone = self._chain()
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if negate:
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clone.query.add_q(~Q(*args, **kwargs))
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else:
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@ -800,7 +800,7 @@ class QuerySet:
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and usually it will be more natural to use other methods.
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"""
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if isinstance(filter_obj, Q):
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clone = self._clone()
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clone = self._chain()
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clone.query.add_q(filter_obj)
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return clone
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else:
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@ -808,7 +808,7 @@ class QuerySet:
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def _combinator_query(self, combinator, *other_qs, all=False):
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# Clone the query to inherit the select list and everything
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clone = self._clone()
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clone = self._chain()
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# Clear limits and ordering so they can be reapplied
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clone.query.clear_ordering(True)
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clone.query.clear_limits()
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@ -846,7 +846,7 @@ class QuerySet:
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"""
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if nowait and skip_locked:
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raise ValueError('The nowait option cannot be used with skip_locked.')
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obj = self._clone()
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obj = self._chain()
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obj._for_write = True
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obj.query.select_for_update = True
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obj.query.select_for_update_nowait = nowait
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@ -867,7 +867,7 @@ class QuerySet:
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if self._fields is not None:
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raise TypeError("Cannot call select_related() after .values() or .values_list()")
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obj = self._clone()
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obj = self._chain()
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if fields == (None,):
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obj.query.select_related = False
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elif fields:
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@ -885,7 +885,7 @@ class QuerySet:
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When prefetch_related() is called more than once, append to the list of
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prefetch lookups. If prefetch_related(None) is called, clear the list.
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"""
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clone = self._clone()
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clone = self._chain()
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if lookups == (None,):
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clone._prefetch_related_lookups = ()
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else:
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@ -911,7 +911,7 @@ class QuerySet:
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annotations[arg.default_alias] = arg
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annotations.update(kwargs)
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clone = self._clone()
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clone = self._chain()
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names = self._fields
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if names is None:
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names = {f.name for f in self.model._meta.get_fields()}
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@ -936,7 +936,7 @@ class QuerySet:
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"""Return a new QuerySet instance with the ordering changed."""
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assert self.query.can_filter(), \
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"Cannot reorder a query once a slice has been taken."
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obj = self._clone()
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obj = self._chain()
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obj.query.clear_ordering(force_empty=False)
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obj.query.add_ordering(*field_names)
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return obj
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@ -947,7 +947,7 @@ class QuerySet:
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"""
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assert self.query.can_filter(), \
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"Cannot create distinct fields once a slice has been taken."
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obj = self._clone()
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obj = self._chain()
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obj.query.add_distinct_fields(*field_names)
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return obj
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@ -956,7 +956,7 @@ class QuerySet:
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"""Add extra SQL fragments to the query."""
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assert self.query.can_filter(), \
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"Cannot change a query once a slice has been taken"
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clone = self._clone()
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clone = self._chain()
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clone.query.add_extra(select, select_params, where, params, tables, order_by)
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return clone
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@ -964,7 +964,7 @@ class QuerySet:
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"""Reverse the ordering of the QuerySet."""
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if not self.query.can_filter():
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raise TypeError('Cannot reverse a query once a slice has been taken.')
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clone = self._clone()
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clone = self._chain()
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clone.query.standard_ordering = not clone.query.standard_ordering
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return clone
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@ -977,7 +977,7 @@ class QuerySet:
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"""
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if self._fields is not None:
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raise TypeError("Cannot call defer() after .values() or .values_list()")
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clone = self._clone()
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clone = self._chain()
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if fields == (None,):
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clone.query.clear_deferred_loading()
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else:
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@ -996,13 +996,13 @@ class QuerySet:
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# Can only pass None to defer(), not only(), as the rest option.
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# That won't stop people trying to do this, so let's be explicit.
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raise TypeError("Cannot pass None as an argument to only().")
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clone = self._clone()
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clone = self._chain()
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clone.query.add_immediate_loading(fields)
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return clone
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def using(self, alias):
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"""Select which database this QuerySet should execute against."""
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clone = self._clone()
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clone = self._chain()
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clone._db = alias
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return clone
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@ -1070,19 +1070,31 @@ class QuerySet:
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self._insert(item, fields=fields, using=self.db)
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return inserted_ids
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def _clone(self, **kwargs):
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query = self.query.clone()
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if self._sticky_filter:
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query.filter_is_sticky = True
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clone = self.__class__(model=self.model, query=query, using=self._db, hints=self._hints)
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clone._for_write = self._for_write
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clone._prefetch_related_lookups = self._prefetch_related_lookups
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clone._known_related_objects = self._known_related_objects
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clone._iterable_class = self._iterable_class
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clone._fields = self._fields
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def _chain(self, **kwargs):
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"""
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Return a copy of the current QuerySet that's ready for another
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operation.
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"""
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obj = self._clone()
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if obj._sticky_filter:
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obj.query.filter_is_sticky = True
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obj._sticky_filter = False
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obj.__dict__.update(kwargs)
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return obj
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clone.__dict__.update(kwargs)
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return clone
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def _clone(self):
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"""
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Return a copy of the current QuerySet. A lightweight alternative
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to deepcopy().
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"""
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c = self.__class__(model=self.model, query=self.query.clone(), using=self._db, hints=self._hints)
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c._sticky_filter = self._sticky_filter
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c._for_write = self._for_write
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c._prefetch_related_lookups = self._prefetch_related_lookups[:]
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c._known_related_objects = self._known_related_objects
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c._iterable_class = self._iterable_class
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c._fields = self._fields
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return c
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def _fetch_all(self):
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if self._result_cache is None:
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@ -1304,7 +1316,7 @@ class Prefetch:
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obj_dict = self.__dict__.copy()
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if self.queryset is not None:
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# Prevent the QuerySet from being evaluated
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obj_dict['queryset'] = self.queryset._clone(
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obj_dict['queryset'] = self.queryset._chain(
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_result_cache=[],
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_prefetch_done=True,
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)
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