diff --git a/README.md b/README.md
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_UkVBRE1FLm1k..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_UkVBRE1FLm1k 100644
--- a/README.md
+++ b/README.md
@@ -115,7 +115,8 @@
to the standard library. It can be disabled with
`orjson.OPT_PASSTHROUGH_SUBCLASS`.`dataclasses.dataclass` instances
are now serialized by default and cannot be customized in a
-`default` function. `uuid.UUID` instances are serialized by default.
+`default` function unless `option=orjson.OPT_PASSTHROUGH_DATACLASS` is
+specified. `uuid.UUID` instances are serialized by default.
For any type that is now serialized,
implementations in a `default` function and options enabling them can be
removed but do not need to be. There was no change in deserialization.
@@ -404,6 +405,38 @@
b'"1970-01-01T00:00:00"'
```
+##### OPT_PASSTHROUGH_DATACLASS
+
+Passthrough `dataclasses.dataclass` instances to `default`. This allows
+customizing their output but is much slower.
+
+
+```python
+>>> import orjson, dataclasses
+>>>
+@dataclasses.dataclass
+class User:
+ id: str
+ name: str
+ password: str
+
+def default(obj):
+ if isinstance(obj, User):
+ return {"id": obj.id, "name": obj.name}
+ raise TypeError
+
+>>> orjson.dumps(User("3b1", "asd", "zxc"))
+b'{"id":"3b1","name":"asd","password":"zxc"}'
+>>> orjson.dumps(User("3b1", "asd", "zxc"), option=orjson.OPT_PASSTHROUGH_DATACLASS)
+TypeError: Type is not JSON serializable: User
+>>> orjson.dumps(
+ User("3b1", "asd", "zxc"),
+ option=orjson.OPT_PASSTHROUGH_DATACLASS,
+ default=default,
+ )
+b'{"id":"3b1","name":"asd"}'
+```
+
##### OPT_PASSTHROUGH_DATETIME
Passthrough `datetime.datetime`, `datetime.date`, and `datetime.time` instances
diff --git a/orjson.pyi b/orjson.pyi
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_b3Jqc29uLnB5aQ==..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_b3Jqc29uLnB5aQ== 100644
--- a/orjson.pyi
+++ b/orjson.pyi
@@ -17,6 +17,7 @@
OPT_NAIVE_UTC: int
OPT_NON_STR_KEYS: int
OPT_OMIT_MICROSECONDS: int
+OPT_PASSTHROUGH_DATACLASS: int
OPT_PASSTHROUGH_DATETIME: int
OPT_PASSTHROUGH_SUBCLASS: int
OPT_SERIALIZE_DATACLASS: int
diff --git a/src/lib.rs b/src/lib.rs
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_c3JjL2xpYi5ycw==..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_c3JjL2xpYi5ycw== 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -106,6 +106,11 @@
opt!(mptr, "OPT_OMIT_MICROSECONDS\0", opt::OMIT_MICROSECONDS);
opt!(
mptr,
+ "OPT_PASSTHROUGH_DATACLASS\0",
+ opt::PASSTHROUGH_DATACLASS
+ );
+ opt!(
+ mptr,
"OPT_PASSTHROUGH_DATETIME\0",
opt::PASSTHROUGH_DATETIME
);
diff --git a/src/opt.rs b/src/opt.rs
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_c3JjL29wdC5ycw==..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_c3JjL29wdC5ycw== 100644
--- a/src/opt.rs
+++ b/src/opt.rs
@@ -13,6 +13,7 @@
pub const PASSTHROUGH_SUBCLASS: Opt = 1 << 8;
pub const PASSTHROUGH_DATETIME: Opt = 1 << 9;
pub const APPEND_NEWLINE: Opt = 1 << 10;
+pub const PASSTHROUGH_DATACLASS: Opt = 1 << 11;
// deprecated
pub const SERIALIZE_DATACLASS: Opt = 0;
@@ -20,7 +21,8 @@
pub const SORT_OR_NON_STR_KEYS: Opt = SORT_KEYS | NON_STR_KEYS;
-pub const NOT_PASSTHROUGH: Opt = !(PASSTHROUGH_DATETIME | PASSTHROUGH_SUBCLASS);
+pub const NOT_PASSTHROUGH: Opt =
+ !(PASSTHROUGH_DATETIME | PASSTHROUGH_DATACLASS | PASSTHROUGH_SUBCLASS);
pub const MAX_OPT: i32 = (APPEND_NEWLINE
| INDENT_2
@@ -28,6 +30,7 @@
| NON_STR_KEYS
| OMIT_MICROSECONDS
| PASSTHROUGH_DATETIME
+ | PASSTHROUGH_DATACLASS
| PASSTHROUGH_SUBCLASS
| SERIALIZE_DATACLASS
| SERIALIZE_NUMPY
diff --git a/src/serialize/encode.rs b/src/serialize/encode.rs
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_c3JjL3NlcmlhbGl6ZS9lbmNvZGUucnM=..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_c3JjL3NlcmlhbGl6ZS9lbmNvZGUucnM= 100644
--- a/src/serialize/encode.rs
+++ b/src/serialize/encode.rs
@@ -143,7 +143,9 @@
&& opts & PASSTHROUGH_SUBCLASS == 0
{
ObType::Dict
- } else if ffi!(PyDict_Contains((*ob_type).tp_dict, DATACLASS_FIELDS_STR)) == 1 {
+ } else if opts & PASSTHROUGH_DATACLASS == 0
+ && ffi!(PyDict_Contains((*ob_type).tp_dict, DATACLASS_FIELDS_STR)) == 1
+ {
ObType::Dataclass
} else if opts & SERIALIZE_NUMPY != 0 && is_numpy_scalar(ob_type) {
ObType::NumpyScalar
diff --git a/test/test_api.py b/test/test_api.py
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_dGVzdC90ZXN0X2FwaS5weQ==..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_dGVzdC90ZXN0X2FwaS5weQ== 100644
--- a/test/test_api.py
+++ b/test/test_api.py
@@ -93,7 +93,7 @@
dumps() option out of range high
"""
with self.assertRaises(orjson.JSONEncodeError):
- orjson.dumps(True, option=1 << 11)
+ orjson.dumps(True, option=1 << 12)
def test_opts_multiple(self):
"""
diff --git a/test/test_dataclass.py b/test/test_dataclass.py
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_dGVzdC90ZXN0X2RhdGFjbGFzcy5weQ==..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_dGVzdC90ZXN0X2RhdGFjbGFzcy5weQ== 100644
--- a/test/test_dataclass.py
+++ b/test/test_dataclass.py
@@ -2,7 +2,7 @@
import unittest
import uuid
-from dataclasses import InitVar, dataclass, field
+from dataclasses import InitVar, asdict, dataclass, field
from enum import Enum
from typing import ClassVar, Dict, Optional
@@ -250,3 +250,37 @@
orjson.dumps(obj, option=orjson.OPT_SERIALIZE_DATACLASS),
b'{"name":"a","number":1,"sub":null}',
)
+
+
+class DataclassPassthroughTests(unittest.TestCase):
+ def test_dataclass_passthrough_raise(self):
+ """
+ dumps() dataclass passes to default with OPT_PASSTHROUGH_DATACLASS
+ """
+ obj = Dataclass1("a", 1, None)
+ with self.assertRaises(orjson.JSONEncodeError):
+ orjson.dumps(obj, option=orjson.OPT_PASSTHROUGH_DATACLASS)
+ with self.assertRaises(orjson.JSONEncodeError):
+ orjson.dumps(
+ InitDataclass("zxc", "vbn"), option=orjson.OPT_PASSTHROUGH_DATACLASS
+ )
+
+ def test_dataclass_passthrough_default(self):
+ """
+ dumps() dataclass passes to default with OPT_PASSTHROUGH_DATACLASS
+ """
+ obj = Dataclass1("a", 1, None)
+ self.assertEqual(
+ orjson.dumps(obj, option=orjson.OPT_PASSTHROUGH_DATACLASS, default=asdict),
+ b'{"name":"a","number":1,"sub":null}',
+ )
+
+ def default(obj):
+ if isinstance(obj, Dataclass1):
+ return {"name": obj.name, "number": obj.number}
+ raise TypeError
+
+ self.assertEqual(
+ orjson.dumps(obj, option=orjson.OPT_PASSTHROUGH_DATACLASS, default=default),
+ b'{"name":"a","number":1}',
+ )
diff --git a/test/test_numpy.py b/test/test_numpy.py
index b0c889bccb37e811fbb6b3d3b42f9be5d956f38d_dGVzdC90ZXN0X251bXB5LnB5..ac110ee6b3e99b7c9633ee963d01c0780f5f2630_dGVzdC90ZXN0X251bXB5LnB5 100644
--- a/test/test_numpy.py
+++ b/test/test_numpy.py
@@ -2,4 +2,6 @@
import unittest
+import pytest
+
import orjson
@@ -5,5 +7,4 @@
import orjson
-import pytest
try:
import numpy