def _get_field(model, name):
from django.db.models.fields import FieldDoesNotExist
# Create a fake query object so we can easily work out what field
# type we are dealing with
qs = Query(model)
opts = qs.get_meta()
alias = qs.get_initial_alias()
parts = name.split(LOOKUP_SEP)
# The following is borrowed from the innards of Query.add_filter - it strips out __gt, __exact et al.
num_parts = len(parts)
if num_parts > 1 and parts[-1] in qs.query_terms:
# Traverse the lookup query to distinguish related fields from
# lookup types.
for counter, field_name in enumerate(parts, 1):
try:
lookup_field = model._meta.get_field(field_name)
except FieldDoesNotExist:
# Not a field. Bail out.
parts.pop()
break
# Unless we're at the end of the list of lookups, let's attempt
# to continue traversing relations.
if counter < num_parts:
try:
model = lookup_field.rel.to
except AttributeError:
# Not a related field. Bail out.
parts.pop()
break
return resolve_field(qs, parts, opts, alias)
def test_filter_conditional(self):
query = Query(Item)
where = query.build_where(Func(output_field=BooleanField()))
exact = where.children[0]
self.assertIsInstance(exact, Exact)
self.assertIsInstance(exact.lhs, Func)
self.assertIs(exact.rhs, True)
def __init__(self, model, query=None, using=None):
# the model needs to be defined so that we can construct our custom
# query
if query is None:
query = Query(model)
query.add_q(models.Q(effective_to__isnull=True))
return super(ActiveQuerySet, self).__init__(model, query, using)
def resolve_lookup(self, model_cls: Type[Model], lookup: str) -> Field:
query = Query(model_cls)
lookup_parts, field_parts, is_expression = query.solve_lookup_type(
lookup)
if lookup_parts:
raise FieldError('Lookups not supported yet')
currently_observed_model = model_cls
current_field = None
for field_part in field_parts:
if field_part == 'pk':
return self.django_context.get_primary_key_field(
currently_observed_model)
current_field = currently_observed_model._meta.get_field(
field_part)
if not isinstance(current_field, (ForeignObjectRel, RelatedField)):
continue
currently_observed_model = self.django_context.fields_context.get_related_model_cls(
current_field)
if isinstance(current_field, ForeignObjectRel):
current_field = self.django_context.get_primary_key_field(
currently_observed_model)
# if it is None, solve_lookup_type() will fail earlier
assert current_field is not None
return current_field
def __init__(self, model, query=None, using=None):
# the model needs to be defined so that we can construct our custom
# query
if query is None:
query = Query(model)
query.add_q(models.Q(effective_to__isnull=True))
return super(ActiveQuerySet, self).__init__(model, query, using)
def resolve_lookup_into_field(self, model_cls: Type[Model], lookup: str) -> Union[Field, ForeignObjectRel]:
query = Query(model_cls)
lookup_parts, field_parts, is_expression = query.solve_lookup_type(lookup)
if lookup_parts:
raise LookupsAreUnsupported()
return self._resolve_field_from_parts(field_parts, model_cls)
def _get_field(model, name):
# Create a fake query object so we can easily work out what field
# type we are dealing with
qs = Query(model)
parts = name.split(LOOKUP_SEP)
# The following is borrowed from the innards of Query.add_filter - it strips out __gt, __exact et al.
num_parts = len(parts)
if num_parts > 1 and parts[-1] in QUERY_TERMS:
# Traverse the lookup query to distinguish related fields from
# lookup types.
for counter, field_name in enumerate(parts, 1):
try:
lookup_field = model._meta.get_field(field_name)
except FieldDoesNotExist:
# Not a field. Bail out.
parts.pop()
break
# Unless we're at the end of the list of lookups, let's attempt
# to continue traversing relations.
if counter < num_parts:
try:
model = lookup_field.rel.to
except AttributeError:
# Not a related field. Bail out.
parts.pop()
break
return qs.names_to_path(parts, qs.get_meta(), True, fail_on_missing=False)[1]
def test_simple_query(self):
query = Query(Author)
where = query.build_where(Q(num__gt=2))
lookup = where.children[0]
self.assertIsInstance(lookup, GreaterThan)
self.assertEqual(lookup.rhs, 2)
self.assertEqual(lookup.lhs.target, Author._meta.get_field('num'))
def _get_field(model, name):
from django.db.models.fields import FieldDoesNotExist
# Create a fake query object so we can easily work out what field
# type we are dealing with
qs = Query(model)
opts = qs.get_meta()
alias = qs.get_initial_alias()
parts = name.split(LOOKUP_SEP)
# The following is borrowed from the innards of Query.add_filter - it strips out __gt, __exact et al.
num_parts = len(parts)
if num_parts > 1 and parts[-1] in qs.query_terms:
# Traverse the lookup query to distinguish related fields from
# lookup types.
for counter, field_name in enumerate(parts, 1):
try:
lookup_field = model._meta.get_field(field_name)
except FieldDoesNotExist:
# Not a field. Bail out.
parts.pop()
break
# Unless we're at the end of the list of lookups, let's attempt
# to continue traversing relations.
if counter < num_parts:
try:
model = lookup_field.rel.to
except AttributeError:
# Not a related field. Bail out.
parts.pop()
break
return resolve_field(qs, parts, opts, alias)
def _get_field(model, name):
# Create a fake query object so we can easily work out what field
# type we are dealing with
parts = name.split(LOOKUP_SEP)
# The following is borrowed from the innards of Query.add_filter - it strips out __gt, __exact et al.
num_parts = len(parts)
if num_parts > 1 and parts[-1] in Query.query_terms:
# Traverse the lookup query to distinguish related fields from
# lookup types.
for counter, field_name in enumerate(parts, 1):
try:
lookup_field = model._meta.get_field(field_name)
except FieldDoesNotExist:
# Not a field. Bail out.
parts.pop()
break
# Unless we're at the end of the list of lookups, let's attempt
# to continue traversing relations.
if counter < num_parts:
try:
model = lookup_field.rel.to
except AttributeError:
# Not a related field. Bail out.
parts.pop()
break
qs = Query(model)
return qs.names_to_path(parts, qs.get_meta(), True,
fail_on_missing=False)[1]
def _get_condition_sql(self, model, schema_editor):
if self.condition is None:
return None
query = Query(model=model)
where = query.build_where(self.condition)
compiler = query.get_compiler(connection=schema_editor.connection)
sql, params = where.as_sql(compiler, schema_editor.connection)
return sql % tuple(schema_editor.quote_value(p) for p in params)
def constraint_sql(self, model, schema_editor):
query = Query(model)
where = query.build_where(self.check)
connection = schema_editor.connection
compiler = connection.ops.compiler('SQLCompiler')(query, connection, 'default')
sql, params = where.as_sql(compiler, connection)
params = tuple(schema_editor.quote_value(p) for p in params)
return schema_editor.sql_check_constraint % {'check': sql % params}
def _get_condition_sql(self, model, schema_editor):
if self.condition is None:
return None
query = Query(model=model, alias_cols=False)
where = query.build_where(self.condition)
compiler = query.get_compiler(connection=schema_editor.connection)
sql, params = where.as_sql(compiler, schema_editor.connection)
return sql % tuple(schema_editor.quote_value(p) for p in params)
def test_multiple_fields(self):
query = Query(Item)
where = query.build_where(Q(modified__gt=F('created')))
lookup = where.children[0]
self.assertIsInstance(lookup, GreaterThan)
self.assertIsInstance(lookup.rhs, SimpleCol)
self.assertIsInstance(lookup.lhs, SimpleCol)
self.assertEqual(lookup.rhs.target, Item._meta.get_field('created'))
self.assertEqual(lookup.lhs.target, Item._meta.get_field('modified'))
def follow_model_field_lookup(model, lookup):
"""
Follow a model lookup `foreignkey__foreignkey__field` in the same
way that Django QuerySet.filter() does, returning the final models.Field.
"""
query = Query(model)
lookup_splitted = lookup.split(LOOKUP_SEP)
_, field, _, _ = query.names_to_path(lookup_splitted, query.get_meta())
return field
def test_transform(self):
query = Query(Author)
with register_lookup(CharField, Lower):
where = query.build_where(~Q(name__lower='foo'))
lookup = where.children[0]
self.assertIsInstance(lookup, Exact)
self.assertIsInstance(lookup.lhs, Lower)
self.assertIsInstance(lookup.lhs.lhs, SimpleCol)
self.assertEqual(lookup.lhs.lhs.target, Author._meta.get_field('name'))
def test_q_annotation(self):
query = Query(None)
check = ExpressionWrapper(
Q(RawSQL("%s IS NULL", (None, ), BooleanField()))
| Q(Exists(Item.objects.all())),
BooleanField(),
)
query.add_annotation(check, "_check")
result = query.get_compiler(using=DEFAULT_DB_ALIAS).execute_sql(SINGLE)
self.assertEqual(result[0], 1)
def test_negated_nullable(self):
query = Query(Item)
where = query.build_where(~Q(modified__lt=datetime(2017, 1, 1)))
self.assertTrue(where.negated)
lookup = where.children[0]
self.assertIsInstance(lookup, LessThan)
self.assertEqual(lookup.lhs.target, Item._meta.get_field('modified'))
lookup = where.children[1]
self.assertIsInstance(lookup, IsNull)
self.assertEqual(lookup.lhs.target, Item._meta.get_field('modified'))
def test_names_to_path_field(self):
query = Query(None)
query.add_annotation(Value(True), "value")
path, final_field, targets, names = query.names_to_path(["value"],
opts=None)
self.assertEqual(path, [])
self.assertIsInstance(final_field, BooleanField)
self.assertEqual(len(targets), 1)
self.assertIsInstance(targets[0], BooleanField)
self.assertEqual(names, [])
def test_rawsql_annotation(self):
query = Query(None)
sql = "%s IS NULL"
# Wrap with a CASE WHEN expression if a database backend (e.g. Oracle)
# doesn't support boolean expression in SELECT list.
if not connection.features.supports_boolean_expr_in_select_clause:
sql = f"CASE WHEN {sql} THEN 1 ELSE 0 END"
query.add_annotation(RawSQL(sql, (None, ), BooleanField()), "_check")
result = query.get_compiler(using=DEFAULT_DB_ALIAS).execute_sql(SINGLE)
self.assertEqual(result[0], 1)
def test_transform(self):
query = Query(Author, alias_cols=False)
with register_lookup(CharField, Lower):
where = query.build_where(~Q(name__lower="foo"))
lookup = where.children[0]
self.assertIsInstance(lookup, Exact)
self.assertIsInstance(lookup.lhs, Lower)
self.assertIsInstance(lookup.lhs.lhs, Col)
self.assertIsNone(lookup.lhs.lhs.alias)
self.assertEqual(lookup.lhs.lhs.target, Author._meta.get_field("name"))
def test_foreign_key_exclusive(self):
query = Query(ObjectC)
where = query.build_where(Q(objecta=None) | Q(objectb=None))
a_isnull = where.children[0]
self.assertIsInstance(a_isnull, RelatedIsNull)
self.assertIsInstance(a_isnull.lhs, SimpleCol)
self.assertEqual(a_isnull.lhs.target, ObjectC._meta.get_field('objecta'))
b_isnull = where.children[1]
self.assertIsInstance(b_isnull, RelatedIsNull)
self.assertIsInstance(b_isnull.lhs, SimpleCol)
self.assertEqual(b_isnull.lhs.target, ObjectC._meta.get_field('objectb'))
def test_multiple_fields(self):
query = Query(Item, alias_cols=False)
where = query.build_where(Q(modified__gt=F("created")))
lookup = where.children[0]
self.assertIsInstance(lookup, GreaterThan)
self.assertIsInstance(lookup.rhs, Col)
self.assertIsNone(lookup.rhs.alias)
self.assertIsInstance(lookup.lhs, Col)
self.assertIsNone(lookup.lhs.alias)
self.assertEqual(lookup.rhs.target, Item._meta.get_field("created"))
self.assertEqual(lookup.lhs.target, Item._meta.get_field("modified"))
def resolve_lookup_expected_type(self, ctx: MethodContext,
model_cls: Type[Model],
lookup: str) -> MypyType:
query = Query(model_cls)
try:
lookup_parts, field_parts, is_expression = query.solve_lookup_type(
lookup)
if is_expression:
return AnyType(TypeOfAny.explicit)
except FieldError as exc:
ctx.api.fail(exc.args[0], ctx.context)
return AnyType(TypeOfAny.from_error)
field = self._resolve_field_from_parts(field_parts, model_cls)
lookup_cls = None
if lookup_parts:
lookup = lookup_parts[-1]
lookup_cls = field.get_lookup(lookup)
if lookup_cls is None:
# unknown lookup
return AnyType(TypeOfAny.explicit)
if lookup_cls is None or isinstance(lookup_cls, Exact):
return self.get_field_lookup_exact_type(
helpers.get_typechecker_api(ctx), field)
assert lookup_cls is not None
lookup_info = helpers.lookup_class_typeinfo(
helpers.get_typechecker_api(ctx), lookup_cls)
if lookup_info is None:
return AnyType(TypeOfAny.explicit)
for lookup_base in helpers.iter_bases(lookup_info):
if lookup_base.args and isinstance(lookup_base.args[0], Instance):
lookup_type: MypyType = lookup_base.args[0]
# if it's Field, consider lookup_type a __get__ of current field
if (isinstance(lookup_type, Instance)
and lookup_type.type.fullname()
== fullnames.FIELD_FULLNAME):
field_info = helpers.lookup_class_typeinfo(
helpers.get_typechecker_api(ctx), field.__class__)
if field_info is None:
return AnyType(TypeOfAny.explicit)
lookup_type = helpers.get_private_descriptor_type(
field_info,
'_pyi_private_get_type',
is_nullable=field.null)
return lookup_type
return AnyType(TypeOfAny.explicit)
def test_foreign_key_exclusive(self):
query = Query(ObjectC, alias_cols=False)
where = query.build_where(Q(objecta=None) | Q(objectb=None))
a_isnull = where.children[0]
self.assertIsInstance(a_isnull, RelatedIsNull)
self.assertIsInstance(a_isnull.lhs, Col)
self.assertIsNone(a_isnull.lhs.alias)
self.assertEqual(a_isnull.lhs.target, ObjectC._meta.get_field("objecta"))
b_isnull = where.children[1]
self.assertIsInstance(b_isnull, RelatedIsNull)
self.assertIsInstance(b_isnull.lhs, Col)
self.assertIsNone(b_isnull.lhs.alias)
self.assertEqual(b_isnull.lhs.target, ObjectC._meta.get_field("objectb"))
def test_simplecol_query(self):
query = Query(Author)
where = query.build_where(Q(num__gt=2, name__isnull=False) | Q(num__lt=F('id')))
name_isnull_lookup, num_gt_lookup = where.children[0].children
self.assertIsInstance(num_gt_lookup, GreaterThan)
self.assertIsInstance(num_gt_lookup.lhs, SimpleCol)
self.assertIsInstance(name_isnull_lookup, IsNull)
self.assertIsInstance(name_isnull_lookup.lhs, SimpleCol)
num_lt_lookup = where.children[1]
self.assertIsInstance(num_lt_lookup, LessThan)
self.assertIsInstance(num_lt_lookup.rhs, SimpleCol)
self.assertIsInstance(num_lt_lookup.lhs, SimpleCol)
def test_simplecol_query(self):
query = Query(Author)
where = query.build_where(Q(num__gt=2, name__isnull=False) | Q(num__lt=F('id')))
name_isnull_lookup, num_gt_lookup = where.children[0].children
self.assertIsInstance(num_gt_lookup, GreaterThan)
self.assertIsInstance(num_gt_lookup.lhs, SimpleCol)
self.assertIsInstance(name_isnull_lookup, IsNull)
self.assertIsInstance(name_isnull_lookup.lhs, SimpleCol)
num_lt_lookup = where.children[1]
self.assertIsInstance(num_lt_lookup, LessThan)
self.assertIsInstance(num_lt_lookup.rhs, SimpleCol)
self.assertIsInstance(num_lt_lookup.lhs, SimpleCol)
def test_complex_query(self):
query = Query(Author)
where = query.build_where(Q(num__gt=2) | Q(num__lt=0))
self.assertEqual(where.connector, OR)
lookup = where.children[0]
self.assertIsInstance(lookup, GreaterThan)
self.assertEqual(lookup.rhs, 2)
self.assertEqual(lookup.lhs.target, Author._meta.get_field('num'))
lookup = where.children[1]
self.assertIsInstance(lookup, LessThan)
self.assertEqual(lookup.rhs, 0)
self.assertEqual(lookup.lhs.target, Author._meta.get_field('num'))
def get_related_decrement_value(self, using):
qn = self.get_quote_name(using)
related_query = Query(self.manager.related.model)
related_query.add_extra(None, None, [
"%s = %s.%s" %
(qn(self.model._meta.pk.get_attname_column()[1]), 'OLD',
qn(self.manager.related.field.m2m_column_name()))
], None, None, None)
related_query.add_fields([self.fieldname])
related_query.clear_ordering(force_empty=True)
related_query.default_cols = False
related_filter_where, related_where_params = related_query.get_compiler(
using=using).as_sql()
return "%s - (%s)" % (qn(self.fieldname), related_filter_where)
def get_related_decrement_value(self, using):
qn = self.get_quote_name(using)
related_query = Query(self.manager.related.model)
related_query.add_extra(None, None,
["%s = %s.%s" % (qn(self.model._meta.pk.get_attname_column()[1]), 'OLD', qn(self.manager.related.field.m2m_column_name()))],
None, None, None)
related_query.add_fields([self.fieldname])
related_query.clear_ordering(force_empty=True)
related_query.default_cols = False
related_filter_where, related_where_params = related_query.get_compiler(using=using).as_sql()
return "%s - (%s)" % (qn(self.fieldname), related_filter_where)
def test_non_alias_cols_query(self):
query = Query(Author, alias_cols=False)
where = query.build_where(Q(num__gt=2, name__isnull=False) | Q(num__lt=F("id")))
name_isnull_lookup, num_gt_lookup = where.children[0].children
self.assertIsInstance(num_gt_lookup, GreaterThan)
self.assertIsInstance(num_gt_lookup.lhs, Col)
self.assertIsNone(num_gt_lookup.lhs.alias)
self.assertIsInstance(name_isnull_lookup, IsNull)
self.assertIsInstance(name_isnull_lookup.lhs, Col)
self.assertIsNone(name_isnull_lookup.lhs.alias)
num_lt_lookup = where.children[1]
self.assertIsInstance(num_lt_lookup, LessThan)
self.assertIsInstance(num_lt_lookup.rhs, Col)
self.assertIsNone(num_lt_lookup.rhs.alias)
self.assertIsInstance(num_lt_lookup.lhs, Col)
self.assertIsNone(num_lt_lookup.lhs.alias)
def _get_index_expressions(self, model, schema_editor):
if not self.expressions:
return None
index_expressions = []
for expression in self.expressions:
index_expression = IndexExpression(expression)
index_expression.set_wrapper_classes(schema_editor.connection)
index_expressions.append(index_expression)
return ExpressionList(*index_expressions).resolve_expression(
Query(model, alias_cols=False), )
def test_PGCRYPT_KEY_setting_per_database_decrypt(self, db, model, vals):
conn = connections['secondary']
obj = model(value=vals[0])
field = obj._meta.get_field('value')
col = field.get_col(obj._meta.db_table)
query = Query(model)
compiler = SQLInsertCompiler(query, conn, 'secondary')
sql, params = col.as_sql(compiler, conn)
assert 'secondary_key' in sql
def _get_field(model, name):
if django.VERSION[0] >= 1 and django.VERSION[1] >= 8:
# Django 1.8+ - can use something like
# expression.output_field.get_internal_field() == 'Money..'
raise NotImplementedError("Django 1.8+ support is not implemented.")
from django.db.models.fields import FieldDoesNotExist
# Create a fake query object so we can easily work out what field
# type we are dealing with
qs = Query(model)
opts = qs.get_meta()
alias = qs.get_initial_alias()
parts = name.split(LOOKUP_SEP)
# The following is borrowed from the innards of Query.add_filter - it strips out __gt, __exact et al.
num_parts = len(parts)
if num_parts > 1 and parts[-1] in qs.query_terms:
# Traverse the lookup query to distinguish related fields from
# lookup types.
lookup_model = model
for counter, field_name in enumerate(parts):
try:
lookup_field = lookup_model._meta.get_field(field_name)
except FieldDoesNotExist:
# Not a field. Bail out.
parts.pop()
break
# Unless we're at the end of the list of lookups, let's attempt
# to continue traversing relations.
if (counter + 1) < num_parts:
try:
lookup_model = lookup_field.rel.to
except AttributeError:
# Not a related field. Bail out.
parts.pop()
break
if django.VERSION[0] >= 1 and django.VERSION[1] in (6, 7):
# Django 1.6-1.7
field = qs.setup_joins(parts, opts, alias)[0]
else:
# Django 1.4-1.5
field = qs.setup_joins(parts, opts, alias, False)[0]
return field
def test_foreign_key_f(self):
query = Query(Ranking)
with self.assertRaises(FieldError):
query.build_where(Q(rank__gt=F('author__num')))
def get_related_where(self, fk_name, using, type):
qn = self.get_quote_name(using)
related_where = ["%s = %s.%s" % (qn(self.model._meta.pk.get_attname_column()[1]), type, qn(fk_name))]
related_query = Query(self.manager.related.model)
for name, value in self.filter.iteritems():
related_query.add_q(Q(**{name: value}))
for name, value in self.exclude.iteritems():
related_query.add_q(~Q(**{name: value}))
related_query.add_extra(None, None,
["%s = %s.%s" % (qn(self.model._meta.pk.get_attname_column()[1]), type, qn(self.manager.related.field.m2m_column_name()))],
None, None, None)
related_query.add_count_column()
related_query.clear_ordering(force_empty=True)
related_query.default_cols = False
related_filter_where, related_where_params = related_query.get_compiler(using=using).as_sql()
if related_filter_where is not None:
related_where.append('(' + related_filter_where + ') > 0')
return related_where, related_where_params
def test_foreign_key(self):
query = Query(Item)
msg = 'Joined field references are not permitted in this query'
with self.assertRaisesMessage(FieldError, msg):
query.build_where(Q(creator__num__gt=2))
