Describe the bug
datamodel-code-generator==0.54.1 emits an invalid default for a $ref to an object union when --use-type-alias is enabled
To Reproduce
Example schema:
{
"$defs": {
"A": { "properties": { "type": { "const": "a" } } },
"B": { "properties": { "type": { "const": "b" } } },
"U": {
"anyOf": [
{ "$ref": "#/$defs/A" },
{ "$ref": "#/$defs/B" }
]
}
},
"properties": {
"x": {
"default": { "type": "b" },
"$ref": "#/$defs/U"
}
}
}Used commandline:
$ datamodel-codegen \
--input schema.json \
--input-file-type jsonschema \
--output out.py \
--output-model-type pydantic_v2.BaseModel \
--use-type-alias \
--target-python-version 3.12
Observed output:
type U = A | B
class Model(BaseModel):
x: U | None = {"type": "b"}Observed behavior:
- mypy reports the default as incompatible
- Model().x is a raw dict at runtime, not A | B
Expected:
- emit a validated model default, not a raw dict literal
Describe the bug
datamodel-code-generator==0.54.1emits an invalid default for a$refto an object union when--use-type-aliasis enabledTo Reproduce
Example schema:
{ "$defs": { "A": { "properties": { "type": { "const": "a" } } }, "B": { "properties": { "type": { "const": "b" } } }, "U": { "anyOf": [ { "$ref": "#/$defs/A" }, { "$ref": "#/$defs/B" } ] } }, "properties": { "x": { "default": { "type": "b" }, "$ref": "#/$defs/U" } } }Used commandline:
Observed output:
Observed behavior:
Expected: