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Use stricter serializer for unions of simple types #1132

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merged 3 commits into from Jan 10, 2024
Merged

Use stricter serializer for unions of simple types #1132

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7c6f41a
Use stricter serializer for unions of simple types
alexdrydew Dec 23, 2023
0303d7f
Merge branch 'main' of github.com:pydantic/pydantic-core into pick_co…
alexdrydew Jan 9, 2024
16370b4
Implement retry_with_lax_check in build_simple_serializer
alexdrydew Jan 9, 2024
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18 changes: 11 additions & 7 deletions src/serializers/type_serializers/simple.rs
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Expand Up @@ -5,11 +5,12 @@ use std::borrow::Cow;

use serde::Serialize;

use crate::PydanticSerializationUnexpectedValue;
use crate::{definitions::DefinitionsBuilder, input::Int};

use super::{
infer_json_key, infer_serialize, infer_to_python, BuildSerializer, CombinedSerializer, Extra, IsType, ObType,
SerMode, TypeSerializer,
SerCheck, SerMode, TypeSerializer,
};

#[derive(Debug, Clone)]
Expand Down Expand Up @@ -114,12 +115,15 @@ macro_rules! build_simple_serializer {
let py = value.py();
match extra.ob_type_lookup.is_type(value, $ob_type) {
IsType::Exact => Ok(value.into_py(py)),
IsType::Subclass => match extra.mode {
SerMode::Json => {
let rust_value = value.extract::<$rust_type>()?;
Ok(rust_value.to_object(py))
}
_ => infer_to_python(value, include, exclude, extra),
IsType::Subclass => match extra.check {
SerCheck::Strict => Err(PydanticSerializationUnexpectedValue::new_err(None)),
SerCheck::Lax | SerCheck::None => match extra.mode {
Comment on lines +119 to +120
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I think by introducing this you need to implement retry_with_lax_check for these serializers.

I think a test which attempts to serialize an int subclass in a Union[bool, int] would show this to be necessary.

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@alexdrydew alexdrydew Jan 9, 2024 •
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You are right, such test fails due to falling back to infer_to_python. I've implemented retry_with_lax_check which is always false for bool type (as there should be no bool subtypes in python) and true for int type

SerMode::Json => {
let rust_value = value.extract::<$rust_type>()?;
Ok(rust_value.to_object(py))
}
_ => infer_to_python(value, include, exclude, extra),
},
},
IsType::False => {
extra.warnings.on_fallback_py(self.get_name(), value, extra)?;
Expand Down
86 changes: 86 additions & 0 deletions tests/serializers/test_union.py
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@@ -1,6 +1,8 @@
import dataclasses
import json
import re
import uuid
from decimal import Decimal
from typing import Any, ClassVar, Union

import pytest
Expand Down Expand Up @@ -510,3 +512,87 @@ class Item(BaseModel):
)

assert s.to_python([DBUser(name='John', password='secret')]) == [{'name': 'John'}]


EXAMPLE_UUID = uuid.uuid4()


@pytest.mark.parametrize('order', ['direct', 'inverse'])
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@pytest.mark.parametrize(
'core_schema_left,core_schema_right,input_value,expected_value',
[
(core_schema.int_schema(), core_schema.bool_schema(), True, True),
(core_schema.int_schema(), core_schema.bool_schema(), 1, 1),
(core_schema.str_schema(), core_schema.int_schema(), 1, 1),
(core_schema.str_schema(), core_schema.int_schema(), '1', '1'),
(
core_schema.decimal_schema(),
core_schema.int_schema(),
Decimal('1'),
Decimal('1'),
),
(core_schema.decimal_schema(), core_schema.int_schema(), 1, 1),
(
core_schema.decimal_schema(),
core_schema.float_schema(),
Decimal('1.'),
Decimal('1.'),
),
(
core_schema.uuid_schema(),
core_schema.str_schema(),
EXAMPLE_UUID,
EXAMPLE_UUID,
),
(
core_schema.uuid_schema(),
core_schema.str_schema(),
str(EXAMPLE_UUID),
str(EXAMPLE_UUID),
),
],
)
def test_union_serializer_picks_exact_type_over_subclass(
core_schema_left, core_schema_right, input_value, expected_value, order
):
s = SchemaSerializer(
core_schema.union_schema(
[core_schema_left, core_schema_right] if order == 'direct' else [core_schema_right, core_schema_left]
)
)
assert s.to_python(input_value) == expected_value


@pytest.mark.parametrize('order', ['direct', 'inverse'])
@pytest.mark.parametrize(
'core_schema_left,core_schema_right,input_value,expected_value',
[
(core_schema.int_schema(), core_schema.bool_schema(), True, True),
(core_schema.int_schema(), core_schema.bool_schema(), 1, 1),
(core_schema.str_schema(), core_schema.int_schema(), 1, 1),
(core_schema.str_schema(), core_schema.int_schema(), '1', '1'),
(
core_schema.decimal_schema(),
core_schema.int_schema(),
Decimal('1'),
'1',
),
(core_schema.decimal_schema(), core_schema.int_schema(), 1, 1),
(
core_schema.decimal_schema(),
core_schema.float_schema(),
Decimal('1.'),
'1',
),
],
)
def test_union_serializer_picks_exact_type_over_subclass_json(
core_schema_left, core_schema_right, input_value, expected_value, order
):
s = SchemaSerializer(
core_schema.union_schema(
[core_schema_left, core_schema_right] if order == 'direct' else [core_schema_right, core_schema_left]
)
)
assert s.to_python(input_value, mode='json') == expected_value
assert s.to_json(input_value) == json.dumps(expected_value).encode()