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from dataclasses import dataclass
from typing import Optional
from apischema.json_schema import deserialization_schema
@dataclass
class Node:
value: int
child: Optional["Node"] = None
assert deserialization_schema(Node) == {
"$schema": "http://json-schema.org/draft/2020-12/schema#",
"$ref": "#/$defs/Node",
"$defs": {
"Node": {
"type": "object",
"properties": {
"value": {"type": "integer"},
"child": {
"anyOf": [{"$ref": "#/$defs/Node"}, {"type": "null"}],
"default": None,
},
},
"required": ["value"],
"additionalProperties": False,
}
},
}
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