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from dataclasses import dataclass, field
from apischema import Undefined, UndefinedType, alias, deserialize, serialize
from apischema.fields import with_fields_set
from apischema.json_schema import deserialization_schema
from apischema.metadata import flatten
@dataclass
class JsonSchema:
title: str | UndefinedType = Undefined
description: str | UndefinedType = Undefined
format: str | UndefinedType = Undefined
...
@with_fields_set
@dataclass
class RootJsonSchema:
schema: str | UndefinedType = field(default=Undefined, metadata=alias("$schema"))
defs: list[JsonSchema] = field(default_factory=list, metadata=alias("$defs"))
# This field schema is flattened inside the owning one
json_schema: JsonSchema = field(default_factory=JsonSchema, metadata=flatten)
data = {
"$schema": "http://json-schema.org/draft/2020-12/schema#",
"title": "flattened example",
}
root_schema = RootJsonSchema(
schema="http://json-schema.org/draft/2020-12/schema#",
json_schema=JsonSchema(title="flattened example"),
)
assert deserialize(RootJsonSchema, data) == root_schema
assert serialize(RootJsonSchema, root_schema) == data
assert deserialization_schema(RootJsonSchema) == {
"$schema": "http://json-schema.org/draft/2020-12/schema#",
"$defs": {
"JsonSchema": {
"type": "object",
"properties": {
"title": {"type": "string"},
"description": {"type": "string"},
"format": {"type": "string"},
},
"additionalProperties": False,
}
},
# It results in allOf + unevaluatedProperties=False
"allOf": [
# RootJsonSchema (without JsonSchema)
{
"type": "object",
"properties": {
"$schema": {"type": "string"},
"$defs": {
"type": "array",
"items": {"$ref": "#/$defs/JsonSchema"},
"default": [],
},
},
"additionalProperties": False,
},
# JonsSchema
{"$ref": "#/$defs/JsonSchema"},
],
"unevaluatedProperties": False,
}
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