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Fixed #31836 -- Dropped support for JSONField __contains and __contained_by lookups on SQLite. 

The current implementation works only for basic examples without
supporting nested structures and doesn't follow "the general principle
that the contained object must match the containing object as to
structure and data contents, possibly after discarding some
non-matching array elements or object key/value pairs from the
containing object".
This commit is contained in:
Mariusz Felisiak 2020-07-28 13:06:52 +02:00 committed by GitHub
parent 7dbbe65647
commit ba691933ce
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 57 additions and 54 deletions
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3
django/db/backends/base/features.py
View File

@ -295,6 +295,9 @@ class BaseDatabaseFeatures:
has_native_json_field = False
# Does the backend use PostgreSQL-style JSON operators like '->'?
has_json_operators = False
# Does the backend support __contains and __contained_by lookups for
# a JSONField?
supports_json_field_contains = True
def __init__(self, connection):
self.connection = connection

1
django/db/backends/oracle/features.py
View File

@ -60,6 +60,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
allows_multiple_constraints_on_same_fields = False
supports_boolean_expr_in_select_clause = False
supports_primitives_in_json_field = False
supports_json_field_contains = False
@cached_property
def introspected_field_types(self):

10
django/db/backends/sqlite3/base.py
View File

@ -5,7 +5,6 @@ import datetime
import decimal
import functools
import hashlib
import json
import math
import operator
import re
@ -235,7 +234,6 @@ class DatabaseWrapper(BaseDatabaseWrapper):
create_deterministic_function('DEGREES', 1, none_guard(math.degrees))
create_deterministic_function('EXP', 1, none_guard(math.exp))
create_deterministic_function('FLOOR', 1, none_guard(math.floor))
create_deterministic_function('JSON_CONTAINS', 2, _sqlite_json_contains)
create_deterministic_function('LN', 1, none_guard(math.log))
create_deterministic_function('LOG', 2, none_guard(lambda x, y: math.log(y, x)))
create_deterministic_function('LPAD', 3, _sqlite_lpad)
@ -601,11 +599,3 @@ def _sqlite_lpad(text, length, fill_text):
@none_guard
def _sqlite_rpad(text, length, fill_text):
return (text + fill_text * length)[:length]
@none_guard
def _sqlite_json_contains(haystack, needle):
target, candidate = json.loads(haystack), json.loads(needle)
if isinstance(target, dict) and isinstance(candidate, dict):
return target.items() >= candidate.items()
return target == candidate

1
django/db/backends/sqlite3/features.py
View File

@ -43,6 +43,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
supports_aggregate_filter_clause = Database.sqlite_version_info >= (3, 30, 1)
supports_order_by_nulls_modifier = Database.sqlite_version_info >= (3, 30, 0)
order_by_nulls_first = True
supports_json_field_contains = False
@cached_property
def supports_atomic_references_rename(self):

14
django/db/models/fields/json.py
View File

@ -140,28 +140,30 @@ class DataContains(PostgresOperatorLookup):
postgres_operator = '@>'
def as_sql(self, compiler, connection):
if not connection.features.supports_json_field_contains:
raise NotSupportedError(
'contains lookup is not supported on this database backend.'
)
lhs, lhs_params = self.process_lhs(compiler, connection)
rhs, rhs_params = self.process_rhs(compiler, connection)
params = tuple(lhs_params) + tuple(rhs_params)
return 'JSON_CONTAINS(%s, %s)' % (lhs, rhs), params
def as_oracle(self, compiler, connection):
raise NotSupportedError('contains lookup is not supported on Oracle.')
class ContainedBy(PostgresOperatorLookup):
lookup_name = 'contained_by'
postgres_operator = '<@'
def as_sql(self, compiler, connection):
if not connection.features.supports_json_field_contains:
raise NotSupportedError(
'contained_by lookup is not supported on this database backend.'
)
lhs, lhs_params = self.process_lhs(compiler, connection)
rhs, rhs_params = self.process_rhs(compiler, connection)
params = tuple(rhs_params) + tuple(lhs_params)
return 'JSON_CONTAINS(%s, %s)' % (rhs, lhs), params
def as_oracle(self, compiler, connection):
raise NotSupportedError('contained_by lookup is not supported on Oracle.')
class HasKeyLookup(PostgresOperatorLookup):
logical_operator = None

5
docs/releases/3.1.txt
View File

@ -533,7 +533,10 @@ backends.
``DatabaseFeatures.supports_json_field`` to ``False``. If storing primitives
is not supported, set ``DatabaseFeatures.supports_primitives_in_json_field``
to ``False``. If there is a true datatype for JSON, set
``DatabaseFeatures.has_native_json_field`` to ``True``.
``DatabaseFeatures.has_native_json_field`` to ``True``. If
:lookup:`jsonfield.contains` and :lookup:`jsonfield.contained_by` are not
supported, set ``DatabaseFeatures.supports_json_field_contains`` to
``False``.
* Third party database backends must implement introspection for ``JSONField``
or set ``can_introspect_json_field`` to ``False``.

8
docs/topics/db/queries.txt
View File

@ -960,9 +960,9 @@ contained in the top-level of the field. For example::
>>> Dog.objects.filter(data__contains={'breed': 'collie'})
<QuerySet [<Dog: Meg>]>
.. admonition:: Oracle
.. admonition:: Oracle and SQLite
``contains`` is not supported on Oracle.
``contains`` is not supported on Oracle and SQLite.
.. fieldlookup:: jsonfield.contained_by
@ -984,9 +984,9 @@ subset of those in the value passed. For example::
>>> Dog.objects.filter(data__contained_by={'breed': 'collie'})
<QuerySet [<Dog: Fred>]>
.. admonition:: Oracle
.. admonition:: Oracle and SQLite
``contained_by`` is not supported on Oracle.
``contained_by`` is not supported on Oracle and SQLite.
.. fieldlookup:: jsonfield.has_key

51
tests/model_fields/test_jsonfield.py
View File

@ -1,6 +1,6 @@
import operator
import uuid
from unittest import mock, skipIf, skipUnless
from unittest import mock, skipIf
from django import forms
from django.core import serializers
@ -441,17 +441,20 @@ class TestQuerying(TestCase):
[self.objs[3], self.objs[4], self.objs[6]],
)
@skipIf(
connection.vendor == 'oracle',
"Oracle doesn't support contains lookup.",
)
@skipUnlessDBFeature('supports_json_field_contains')
def test_contains(self):
tests = [
({}, self.objs[2:5] + self.objs[6:8]),
({'baz': {'a': 'b', 'c': 'd'}}, [self.objs[7]]),
({'baz': {'a': 'b'}}, [self.objs[7]]),
({'baz': {'c': 'd'}}, [self.objs[7]]),
({'k': True, 'l': False}, [self.objs[6]]),
({'d': ['e', {'f': 'g'}]}, [self.objs[4]]),
({'d': ['e']}, [self.objs[4]]),
({'d': [{'f': 'g'}]}, [self.objs[4]]),
([1, [2]], [self.objs[5]]),
([1], [self.objs[5]]),
([[2]], [self.objs[5]]),
({'n': [None]}, [self.objs[4]]),
({'j': None}, [self.objs[4]]),
]
@ -460,38 +463,32 @@ class TestQuerying(TestCase):
qs = NullableJSONModel.objects.filter(value__contains=value)
self.assertSequenceEqual(qs, expected)
@skipUnless(
connection.vendor == 'oracle',
"Oracle doesn't support contains lookup.",
)
@skipIfDBFeature('supports_json_field_contains')
def test_contains_unsupported(self):
msg = 'contains lookup is not supported on Oracle.'
msg = 'contains lookup is not supported on this database backend.'
with self.assertRaisesMessage(NotSupportedError, msg):
NullableJSONModel.objects.filter(
value__contains={'baz': {'a': 'b', 'c': 'd'}},
).get()
@skipUnlessDBFeature('supports_primitives_in_json_field')
@skipUnlessDBFeature(
'supports_primitives_in_json_field',
'supports_json_field_contains',
)
def test_contains_primitives(self):
for value in self.primitives:
with self.subTest(value=value):
qs = NullableJSONModel.objects.filter(value__contains=value)
self.assertIs(qs.exists(), True)
@skipIf(
connection.vendor == 'oracle',
"Oracle doesn't support contained_by lookup.",
)
@skipUnlessDBFeature('supports_json_field_contains')
def test_contained_by(self):
qs = NullableJSONModel.objects.filter(value__contained_by={'a': 'b', 'c': 14, 'h': True})
self.assertSequenceEqual(qs, self.objs[2:4])
@skipUnless(
connection.vendor == 'oracle',
"Oracle doesn't support contained_by lookup.",
)
@skipIfDBFeature('supports_json_field_contains')
def test_contained_by_unsupported(self):
msg = 'contained_by lookup is not supported on Oracle.'
msg = 'contained_by lookup is not supported on this database backend.'
with self.assertRaisesMessage(NotSupportedError, msg):
NullableJSONModel.objects.filter(value__contained_by={'a': 'b'}).get()
@ -679,9 +676,15 @@ class TestQuerying(TestCase):
('value__baz__has_any_keys', ['a', 'x']),
('value__has_key', KeyTextTransform('foo', 'value')),
)
# contained_by and contains lookups are not supported on Oracle.
if connection.vendor != 'oracle':
tests += (
for lookup, value in tests:
with self.subTest(lookup=lookup):
self.assertIs(NullableJSONModel.objects.filter(
**{lookup: value},
).exists(), True)
@skipUnlessDBFeature('supports_json_field_contains')
def test_contains_contained_by_with_key_transform(self):
tests = [
('value__contains', KeyTransform('bax', 'value')),
('value__baz__contained_by', {'a': 'b', 'c': 'd', 'e': 'f'}),
(
@ -691,7 +694,7 @@ class TestQuerying(TestCase):
['{"x": {"a": "b", "c": 1, "d": "e"}}'],
)),
),
)
]
for lookup, value in tests:
with self.subTest(lookup=lookup):
self.assertIs(NullableJSONModel.objects.filter(