Fixed #27021 -- Allowed lookup expressions in annotations, aggregations, and QuerySet.filter().
Thanks Hannes Ljungberg and Simon Charette for reviews. Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
This commit is contained in:
Ian Foote
Mariusz Felisiak
parent
f5dccbafb9
commit
f42ccdd835
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@ -6,7 +6,7 @@ from django.conf import settings
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from django.db import DatabaseError, NotSupportedError
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from django.db.backends.base.operations import BaseDatabaseOperations
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from django.db.backends.utils import strip_quotes, truncate_name
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from django.db.models import AutoField, Exists, ExpressionWrapper
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from django.db.models import AutoField, Exists, ExpressionWrapper, Lookup
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from django.db.models.expressions import RawSQL
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from django.db.models.sql.where import WhereNode
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from django.utils import timezone
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@ -202,7 +202,7 @@ END;
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# Oracle stores empty strings as null. If the field accepts the empty
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# string, undo this to adhere to the Django convention of using
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# the empty string instead of null.
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if expression.field.empty_strings_allowed:
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if expression.output_field.empty_strings_allowed:
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converters.append(
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self.convert_empty_bytes
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if internal_type == 'BinaryField' else
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@ -639,7 +639,7 @@ END;
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Oracle supports only EXISTS(...) or filters in the WHERE clause, others
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must be compared with True.
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"""
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if isinstance(expression, (Exists, WhereNode)):
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if isinstance(expression, (Exists, Lookup, WhereNode)):
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return True
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if isinstance(expression, ExpressionWrapper) and expression.conditional:
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return self.conditional_expression_supported_in_where_clause(expression.expression)
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@ -1248,9 +1248,9 @@ class OrderBy(Expression):
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return (template % placeholders).rstrip(), params
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def as_oracle(self, compiler, connection):
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# Oracle doesn't allow ORDER BY EXISTS() unless it's wrapped in
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# a CASE WHEN.
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if isinstance(self.expression, Exists):
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# Oracle doesn't allow ORDER BY EXISTS() or filters unless it's wrapped
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# in a CASE WHEN.
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if connection.ops.conditional_expression_supported_in_where_clause(self.expression):
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copy = self.copy()
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copy.expression = Case(
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When(self.expression, then=True),
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@ -22,6 +22,9 @@ class MultiColSource:
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def get_lookup(self, lookup):
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return self.output_field.get_lookup(lookup)
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def resolve_expression(self, *args, **kwargs):
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return self
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def get_normalized_value(value, lhs):
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from django.db.models import Model
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@ -1,11 +1,10 @@
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import itertools
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import math
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from copy import copy
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from django.core.exceptions import EmptyResultSet
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from django.db.models.expressions import Case, Func, Value, When
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from django.db.models.expressions import Case, Expression, Func, Value, When
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from django.db.models.fields import (
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CharField, DateTimeField, Field, IntegerField, UUIDField,
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BooleanField, CharField, DateTimeField, Field, IntegerField, UUIDField,
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)
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from django.db.models.query_utils import RegisterLookupMixin
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from django.utils.datastructures import OrderedSet
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@ -13,7 +12,7 @@ from django.utils.functional import cached_property
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from django.utils.hashable import make_hashable
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class Lookup:
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class Lookup(Expression):
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lookup_name = None
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prepare_rhs = True
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can_use_none_as_rhs = False
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@ -21,6 +20,7 @@ class Lookup:
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def __init__(self, lhs, rhs):
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self.lhs, self.rhs = lhs, rhs
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self.rhs = self.get_prep_lookup()
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self.lhs = self.get_prep_lhs()
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if hasattr(self.lhs, 'get_bilateral_transforms'):
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bilateral_transforms = self.lhs.get_bilateral_transforms()
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else:
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@ -72,12 +72,20 @@ class Lookup:
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self.lhs, self.rhs = new_exprs
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def get_prep_lookup(self):
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if hasattr(self.rhs, 'resolve_expression'):
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if not self.prepare_rhs or hasattr(self.rhs, 'resolve_expression'):
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return self.rhs
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if self.prepare_rhs and hasattr(self.lhs.output_field, 'get_prep_value'):
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return self.lhs.output_field.get_prep_value(self.rhs)
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if hasattr(self.lhs, 'output_field'):
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if hasattr(self.lhs.output_field, 'get_prep_value'):
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return self.lhs.output_field.get_prep_value(self.rhs)
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elif self.rhs_is_direct_value():
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return Value(self.rhs)
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return self.rhs
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def get_prep_lhs(self):
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if hasattr(self.lhs, 'resolve_expression'):
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return self.lhs
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return Value(self.lhs)
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def get_db_prep_lookup(self, value, connection):
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return ('%s', [value])
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@ -85,7 +93,11 @@ class Lookup:
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lhs = lhs or self.lhs
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if hasattr(lhs, 'resolve_expression'):
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lhs = lhs.resolve_expression(compiler.query)
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return compiler.compile(lhs)
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sql, params = compiler.compile(lhs)
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if isinstance(lhs, Lookup):
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# Wrapped in parentheses to respect operator precedence.
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sql = f'({sql})'
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return sql, params
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def process_rhs(self, compiler, connection):
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value = self.rhs
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@ -110,22 +122,12 @@ class Lookup:
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def rhs_is_direct_value(self):
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return not hasattr(self.rhs, 'as_sql')
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def relabeled_clone(self, relabels):
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new = copy(self)
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new.lhs = new.lhs.relabeled_clone(relabels)
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if hasattr(new.rhs, 'relabeled_clone'):
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new.rhs = new.rhs.relabeled_clone(relabels)
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return new
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def get_group_by_cols(self, alias=None):
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cols = self.lhs.get_group_by_cols()
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if hasattr(self.rhs, 'get_group_by_cols'):
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cols.extend(self.rhs.get_group_by_cols())
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cols = []
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for source in self.get_source_expressions():
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cols.extend(source.get_group_by_cols())
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return cols
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def as_sql(self, compiler, connection):
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raise NotImplementedError
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def as_oracle(self, compiler, connection):
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# Oracle doesn't allow EXISTS() and filters to be compared to another
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# expression unless they're wrapped in a CASE WHEN.
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@ -140,16 +142,8 @@ class Lookup:
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return lookup.as_sql(compiler, connection)
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@cached_property
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def contains_aggregate(self):
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return self.lhs.contains_aggregate or getattr(self.rhs, 'contains_aggregate', False)
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@cached_property
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def contains_over_clause(self):
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return self.lhs.contains_over_clause or getattr(self.rhs, 'contains_over_clause', False)
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@property
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def is_summary(self):
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return self.lhs.is_summary or getattr(self.rhs, 'is_summary', False)
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def output_field(self):
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return BooleanField()
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@property
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def identity(self):
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@ -163,6 +157,21 @@ class Lookup:
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def __hash__(self):
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return hash(make_hashable(self.identity))
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def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
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c = self.copy()
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c.is_summary = summarize
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c.lhs = self.lhs.resolve_expression(query, allow_joins, reuse, summarize, for_save)
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c.rhs = self.rhs.resolve_expression(query, allow_joins, reuse, summarize, for_save)
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return c
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def select_format(self, compiler, sql, params):
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# Wrap filters with a CASE WHEN expression if a database backend
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# (e.g. Oracle) doesn't support boolean expression in SELECT or GROUP
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# BY list.
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if not compiler.connection.features.supports_boolean_expr_in_select_clause:
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sql = f'CASE WHEN {sql} THEN 1 ELSE 0 END'
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return sql, params
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class Transform(RegisterLookupMixin, Func):
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"""
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@ -1262,9 +1262,9 @@ class Query(BaseExpression):
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if hasattr(filter_expr, 'resolve_expression'):
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if not getattr(filter_expr, 'conditional', False):
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raise TypeError('Cannot filter against a non-conditional expression.')
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condition = self.build_lookup(
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['exact'], filter_expr.resolve_expression(self, allow_joins=allow_joins), True
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)
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condition = filter_expr.resolve_expression(self, allow_joins=allow_joins)
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if not isinstance(condition, Lookup):
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condition = self.build_lookup(['exact'], condition, True)
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clause = self.where_class()
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clause.add(condition, AND)
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return clause, []
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@ -208,6 +208,25 @@ class WhereNode(tree.Node):
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clone.resolved = True
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return clone
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@cached_property
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def output_field(self):
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from django.db.models import BooleanField
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return BooleanField()
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def select_format(self, compiler, sql, params):
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# Wrap filters with a CASE WHEN expression if a database backend
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# (e.g. Oracle) doesn't support boolean expression in SELECT or GROUP
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# BY list.
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if not compiler.connection.features.supports_boolean_expr_in_select_clause:
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sql = f'CASE WHEN {sql} THEN 1 ELSE 0 END'
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return sql, params
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def get_db_converters(self, connection):
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return self.output_field.get_db_converters(connection)
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def get_lookup(self, lookup):
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return self.output_field.get_lookup(lookup)
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class NothingNode:
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"""A node that matches nothing."""
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@ -48,6 +48,10 @@ objects that have an ``output_field`` that is a
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:class:`~django.db.models.BooleanField`. The result is provided using the
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``then`` keyword.
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.. versionchanged:: 4.0
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Support for lookup expressions was added.
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Some examples::
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>>> from django.db.models import F, Q, When
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@ -68,6 +72,13 @@ Some examples::
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... account_type=OuterRef('account_type'),
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... ).exclude(pk=OuterRef('pk')).values('pk')
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>>> When(Exists(non_unique_account_type), then=Value('non unique'))
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>>> # Condition can be created using lookup expressions.
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>>> from django.db.models.lookups import GreaterThan, LessThan
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>>> When(
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... GreaterThan(F('registered_on'), date(2014, 1, 1)) &
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... LessThan(F('registered_on'), date(2015, 1, 1)),
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... then='account_type',
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... )
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Keep in mind that each of these values can be an expression.
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@ -25,6 +25,7 @@ Some examples
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from django.db.models import Count, F, Value
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from django.db.models.functions import Length, Upper
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from django.db.models.lookups import GreaterThan
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# Find companies that have more employees than chairs.
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Company.objects.filter(num_employees__gt=F('num_chairs'))
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@ -76,6 +77,13 @@ Some examples
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Exists(Employee.objects.filter(company=OuterRef('pk'), salary__gt=10))
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)
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# Lookup expressions can also be used directly in filters
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Company.objects.filter(GreaterThan(F('num_employees'), F('num_chairs')))
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# or annotations.
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Company.objects.annotate(
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need_chairs=GreaterThan(F('num_employees'), F('num_chairs')),
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)
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Built-in Expressions
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====================
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@ -177,16 +177,21 @@ following methods:
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comparison between ``lhs`` and ``rhs`` such as ``lhs in rhs`` or
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``lhs > rhs``.
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The notation to use a lookup in an expression is
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``<lhs>__<lookup_name>=<rhs>``.
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The primary notation to use a lookup in an expression is
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``<lhs>__<lookup_name>=<rhs>``. Lookups can also be used directly in
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``QuerySet`` filters::
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This class acts as a query expression, but, since it has ``=<rhs>`` on its
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construction, lookups must always be the end of a lookup expression.
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Book.objects.filter(LessThan(F('word_count'), 7500))
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…or annotations::
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Book.objects.annotate(is_short_story=LessThan(F('word_count'), 7500))
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.. attribute:: lhs
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The left-hand side - what is being looked up. The object must follow
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the :ref:`Query Expression API <query-expression>`.
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The left-hand side - what is being looked up. The object typically
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follows the :ref:`Query Expression API <query-expression>`. It may also
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be a plain value.
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.. attribute:: rhs
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@ -213,3 +218,8 @@ following methods:
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.. method:: process_rhs(compiler, connection)
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Behaves the same way as :meth:`process_lhs`, for the right-hand side.
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.. versionchanged:: 4.0
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Support for using lookups in ``QuerySet`` annotations, aggregations,
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and directly in filters was added.
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@ -277,6 +277,9 @@ Models
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* The ``skip_locked`` argument of :meth:`.QuerySet.select_for_update()` is now
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allowed on MariaDB 10.6+.
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* :class:`~django.db.models.Lookup` expressions may now be used in ``QuerySet``
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annotations, aggregations, and directly in filters.
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Requests and Responses
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~~~~~~~~~~~~~~~~~~~~~~
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@ -6,9 +6,13 @@ from operator import attrgetter
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from django.core.exceptions import FieldError
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from django.db import connection, models
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from django.db.models import (
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BooleanField, Exists, ExpressionWrapper, F, Max, OuterRef, Q,
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BooleanField, Case, Exists, ExpressionWrapper, F, Max, OuterRef, Q,
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Subquery, Value, When,
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)
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from django.db.models.functions import Cast, Substr
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from django.db.models.lookups import (
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Exact, GreaterThan, GreaterThanOrEqual, LessThan, LessThanOrEqual,
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)
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from django.db.models.functions import Substr
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from django.test import TestCase, skipUnlessDBFeature
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from django.test.utils import isolate_apps
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@ -1020,3 +1024,156 @@ class LookupTests(TestCase):
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)),
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[stock_1, stock_2],
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)
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class LookupQueryingTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.s1 = Season.objects.create(year=1942, gt=1942)
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cls.s2 = Season.objects.create(year=1842, gt=1942)
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cls.s3 = Season.objects.create(year=2042, gt=1942)
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def test_annotate(self):
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qs = Season.objects.annotate(equal=Exact(F('year'), 1942))
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self.assertCountEqual(
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qs.values_list('year', 'equal'),
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((1942, True), (1842, False), (2042, False)),
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)
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def test_alias(self):
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qs = Season.objects.alias(greater=GreaterThan(F('year'), 1910))
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self.assertCountEqual(qs.filter(greater=True), [self.s1, self.s3])
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def test_annotate_value_greater_than_value(self):
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qs = Season.objects.annotate(greater=GreaterThan(Value(40), Value(30)))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, True), (1842, True), (2042, True)),
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)
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def test_annotate_field_greater_than_field(self):
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qs = Season.objects.annotate(greater=GreaterThan(F('year'), F('gt')))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, False), (1842, False), (2042, True)),
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)
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def test_annotate_field_greater_than_value(self):
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qs = Season.objects.annotate(greater=GreaterThan(F('year'), Value(1930)))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, True), (1842, False), (2042, True)),
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)
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def test_annotate_field_greater_than_literal(self):
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qs = Season.objects.annotate(greater=GreaterThan(F('year'), 1930))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, True), (1842, False), (2042, True)),
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)
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def test_annotate_literal_greater_than_field(self):
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qs = Season.objects.annotate(greater=GreaterThan(1930, F('year')))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, False), (1842, True), (2042, False)),
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)
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def test_annotate_less_than_float(self):
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qs = Season.objects.annotate(lesser=LessThan(F('year'), 1942.1))
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self.assertCountEqual(
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qs.values_list('year', 'lesser'),
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((1942, True), (1842, True), (2042, False)),
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)
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def test_annotate_greater_than_or_equal(self):
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qs = Season.objects.annotate(greater=GreaterThanOrEqual(F('year'), 1942))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, True), (1842, False), (2042, True)),
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)
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def test_annotate_greater_than_or_equal_float(self):
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qs = Season.objects.annotate(greater=GreaterThanOrEqual(F('year'), 1942.1))
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self.assertCountEqual(
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qs.values_list('year', 'greater'),
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((1942, False), (1842, False), (2042, True)),
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)
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def test_combined_lookups(self):
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expression = Exact(F('year'), 1942) | GreaterThan(F('year'), 1942)
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qs = Season.objects.annotate(gte=expression)
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self.assertCountEqual(
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qs.values_list('year', 'gte'),
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((1942, True), (1842, False), (2042, True)),
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)
|
||||
|
||||
def test_lookup_in_filter(self):
|
||||
qs = Season.objects.filter(GreaterThan(F('year'), 1910))
|
||||
self.assertCountEqual(qs, [self.s1, self.s3])
|
||||
|
||||
def test_filter_lookup_lhs(self):
|
||||
qs = Season.objects.annotate(before_20=LessThan(F('year'), 2000)).filter(
|
||||
before_20=LessThan(F('year'), 1900),
|
||||
)
|
||||
self.assertCountEqual(qs, [self.s2, self.s3])
|
||||
|
||||
def test_filter_wrapped_lookup_lhs(self):
|
||||
qs = Season.objects.annotate(before_20=ExpressionWrapper(
|
||||
Q(year__lt=2000),
|
||||
output_field=BooleanField(),
|
||||
)).filter(before_20=LessThan(F('year'), 1900)).values_list('year', flat=True)
|
||||
self.assertCountEqual(qs, [1842, 2042])
|
||||
|
||||
def test_filter_exists_lhs(self):
|
||||
qs = Season.objects.annotate(before_20=Exists(
|
||||
Season.objects.filter(pk=OuterRef('pk'), year__lt=2000),
|
||||
)).filter(before_20=LessThan(F('year'), 1900))
|
||||
self.assertCountEqual(qs, [self.s2, self.s3])
|
||||
|
||||
def test_filter_subquery_lhs(self):
|
||||
qs = Season.objects.annotate(before_20=Subquery(
|
||||
Season.objects.filter(pk=OuterRef('pk')).values(
|
||||
lesser=LessThan(F('year'), 2000),
|
||||
),
|
||||
)).filter(before_20=LessThan(F('year'), 1900))
|
||||
self.assertCountEqual(qs, [self.s2, self.s3])
|
||||
|
||||
def test_combined_lookups_in_filter(self):
|
||||
expression = Exact(F('year'), 1942) | GreaterThan(F('year'), 1942)
|
||||
qs = Season.objects.filter(expression)
|
||||
self.assertCountEqual(qs, [self.s1, self.s3])
|
||||
|
||||
def test_combined_annotated_lookups_in_filter(self):
|
||||
expression = Exact(F('year'), 1942) | GreaterThan(F('year'), 1942)
|
||||
qs = Season.objects.annotate(gte=expression).filter(gte=True)
|
||||
self.assertCountEqual(qs, [self.s1, self.s3])
|
||||
|
||||
def test_combined_annotated_lookups_in_filter_false(self):
|
||||
expression = Exact(F('year'), 1942) | GreaterThan(F('year'), 1942)
|
||||
qs = Season.objects.annotate(gte=expression).filter(gte=False)
|
||||
self.assertSequenceEqual(qs, [self.s2])
|
||||
|
||||
def test_lookup_in_order_by(self):
|
||||
qs = Season.objects.order_by(LessThan(F('year'), 1910), F('year'))
|
||||
self.assertSequenceEqual(qs, [self.s1, self.s3, self.s2])
|
||||
|
||||
@skipUnlessDBFeature('supports_boolean_expr_in_select_clause')
|
||||
def test_aggregate_combined_lookup(self):
|
||||
expression = Cast(GreaterThan(F('year'), 1900), models.IntegerField())
|
||||
qs = Season.objects.aggregate(modern=models.Sum(expression))
|
||||
self.assertEqual(qs['modern'], 2)
|
||||
|
||||
def test_conditional_expression(self):
|
||||
qs = Season.objects.annotate(century=Case(
|
||||
When(
|
||||
GreaterThan(F('year'), 1900) & LessThanOrEqual(F('year'), 2000),
|
||||
then=Value('20th'),
|
||||
),
|
||||
default=Value('other'),
|
||||
)).values('year', 'century')
|
||||
self.assertCountEqual(qs, [
|
||||
{'year': 1942, 'century': '20th'},
|
||||
{'year': 1842, 'century': 'other'},
|
||||
{'year': 2042, 'century': 'other'},
|
||||
])
|
||||
|
|
|
|||
Loading…
Reference in New Issue