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Fix nullable JSON Schema const enums - #3355
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📝 WalkthroughWalkthroughRefactors JSONSchemaParser internals: extracts combined anyOf/oneOf const-enum detection, centralizes root combined-type handling with early-empty detection, and decomposes enum generation into helpers for member extraction, field building, enum creation, and nullable-root registration. ChangesEnum & Root Handling
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Possibly related PRs
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Merging this PR will improve performance by 29.29%
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| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ⚡ | WallTime | test_perf_multiple_files_input |
3.4 s | 2.6 s | +31.62% |
| ⚡ | WallTime | test_perf_duplicate_names |
995.1 ms | 762.5 ms | +30.49% |
| ⚡ | WallTime | test_perf_kubernetes_style_pydantic_v2 |
2.5 s | 1.9 s | +30.28% |
| ⚡ | WallTime | test_perf_complex_refs |
1.8 s | 1.4 s | +29.92% |
| ⚡ | WallTime | test_perf_openapi_large |
2.7 s | 2.1 s | +29.89% |
| ⚡ | WallTime | test_perf_stripe_style_pydantic_v2 |
1.9 s | 1.5 s | +29.34% |
| ⚡ | WallTime | test_perf_aws_style_openapi_pydantic_v2 |
1.7 s | 1.3 s | +29.1% |
| ⚡ | WallTime | test_perf_graphql_style_pydantic_v2 |
740 ms | 575 ms | +28.69% |
| ⚡ | WallTime | test_perf_deep_nested |
4.7 s | 3.7 s | +28.64% |
| ⚡ | WallTime | test_perf_all_options_enabled |
5 s | 3.9 s | +28.23% |
| ⚡ | WallTime | test_perf_large_models_pydantic_v2 |
3.3 s | 2.6 s | +26.12% |
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Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.
Comparing refactor/jsonschema-method-extraction (1d73747) with main (6192212)
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Actionable comments posted: 1
🧹 Nitpick comments (1)
src/datamodel_code_generator/parser/jsonschema.py (1)
4141-4150: ⚡ Quick winDeduplicate combined const-enum handling in
parse_item.
anyOfandoneOfcurrently duplicate the same const-enum extraction/build/dispatch flow even though_parse_combined_const_enumalready encapsulates it. Reusing the helper here avoids drift between inline-item and root-level combined parsing paths.♻️ Suggested refactor
if item.anyOf: - const_enum_data = self._extract_const_enum_from_combined(item.anyOf, item.type) - if const_enum_data is not None: - enum_values, varnames, descriptions, enum_type, nullable = const_enum_data - synthetic_obj = self._create_synthetic_enum_obj( - item, enum_values, varnames, descriptions, enum_type, nullable - ) - if self.should_parse_enum_as_literal(synthetic_obj, property_name=name, property_obj=item): - return self.parse_enum_as_literal(synthetic_obj) - return self.parse_enum(name, synthetic_obj, get_special_path("enum", path), singular_name=singular_name) + if combined_const_enum := self._parse_combined_const_enum( + name, + item, + item.anyOf, + get_special_path("enum", path), + singular_name=singular_name, + ): + return combined_const_enum return self.data_type(data_types=self.parse_any_of(name, item, get_special_path("anyOf", path))) if item.oneOf: - const_enum_data = self._extract_const_enum_from_combined(item.oneOf, item.type) - if const_enum_data is not None: - enum_values, varnames, descriptions, enum_type, nullable = const_enum_data - synthetic_obj = self._create_synthetic_enum_obj( - item, enum_values, varnames, descriptions, enum_type, nullable - ) - if self.should_parse_enum_as_literal(synthetic_obj, property_name=name, property_obj=item): - return self.parse_enum_as_literal(synthetic_obj) - return self.parse_enum(name, synthetic_obj, get_special_path("enum", path), singular_name=singular_name) + if combined_const_enum := self._parse_combined_const_enum( + name, + item, + item.oneOf, + get_special_path("enum", path), + singular_name=singular_name, + ): + return combined_const_enum return self.data_type(data_types=self.parse_one_of(name, item, get_special_path("oneOf", path)))Also applies to: 4152-4161
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/datamodel_code_generator/parser/jsonschema.py` around lines 4141 - 4150, Replace the duplicated const-enum extraction/dispatch logic in the anyOf/oneOf branches by calling the existing helper _parse_combined_const_enum and returning its result when present; specifically, instead of re-running _extract_const_enum_from_combined / _create_synthetic_enum_obj and then calling should_parse_enum_as_literal / parse_enum_as_literal / parse_enum, invoke self._parse_combined_const_enum(...) with the same inputs (item.anyOf or item.oneOf, item.type, name, item, path, singular_name as needed) and if it returns a non-None value return that, otherwise fall back to the existing data_type(...) with self.parse_any_of(...) (or self.parse_one_of(...)) so you remove duplicated logic around _extract_const_enum_from_combined, _create_synthetic_enum_obj, should_parse_enum_as_literal, parse_enum_as_literal, and parse_enum.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/datamodel_code_generator/parser/jsonschema.py`:
- Around line 4613-4624: When building enum member names in the block inside
parser/jsonschema.py (the branch that sets default and field_name when obj.type
!= "string"), handle enum_part == None specially: if enum_part is None set
default = None (a real Python None) and set field_name to a stable "null" token
(e.g. f"{prefix}_null" or just "null") instead of using Python's "None" repr;
update the branch that currently computes field_name (the else branch that calls
_get_field_name_from_dict_enum and uses prefix = obj.type ...) so it checks "if
enum_part is None" first and returns a "null"-based name and None default to
ensure nullable non-string const-enums are represented as optional values rather
than creating members like integer_None.
---
Nitpick comments:
In `@src/datamodel_code_generator/parser/jsonschema.py`:
- Around line 4141-4150: Replace the duplicated const-enum extraction/dispatch
logic in the anyOf/oneOf branches by calling the existing helper
_parse_combined_const_enum and returning its result when present; specifically,
instead of re-running _extract_const_enum_from_combined /
_create_synthetic_enum_obj and then calling should_parse_enum_as_literal /
parse_enum_as_literal / parse_enum, invoke self._parse_combined_const_enum(...)
with the same inputs (item.anyOf or item.oneOf, item.type, name, item, path,
singular_name as needed) and if it returns a non-None value return that,
otherwise fall back to the existing data_type(...) with self.parse_any_of(...)
(or self.parse_one_of(...)) so you remove duplicated logic around
_extract_const_enum_from_combined, _create_synthetic_enum_obj,
should_parse_enum_as_literal, parse_enum_as_literal, and parse_enum.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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Actionable comments posted: 1
🧹 Nitpick comments (1)
src/datamodel_code_generator/parser/jsonschema.py (1)
4141-4150: ⚡ Quick winDeduplicate combined const-enum handling in
parse_item.
anyOfandoneOfcurrently duplicate the same const-enum extraction/build/dispatch flow even though_parse_combined_const_enumalready encapsulates it. Reusing the helper here avoids drift between inline-item and root-level combined parsing paths.♻️ Suggested refactor
if item.anyOf: - const_enum_data = self._extract_const_enum_from_combined(item.anyOf, item.type) - if const_enum_data is not None: - enum_values, varnames, descriptions, enum_type, nullable = const_enum_data - synthetic_obj = self._create_synthetic_enum_obj( - item, enum_values, varnames, descriptions, enum_type, nullable - ) - if self.should_parse_enum_as_literal(synthetic_obj, property_name=name, property_obj=item): - return self.parse_enum_as_literal(synthetic_obj) - return self.parse_enum(name, synthetic_obj, get_special_path("enum", path), singular_name=singular_name) + if combined_const_enum := self._parse_combined_const_enum( + name, + item, + item.anyOf, + get_special_path("enum", path), + singular_name=singular_name, + ): + return combined_const_enum return self.data_type(data_types=self.parse_any_of(name, item, get_special_path("anyOf", path))) if item.oneOf: - const_enum_data = self._extract_const_enum_from_combined(item.oneOf, item.type) - if const_enum_data is not None: - enum_values, varnames, descriptions, enum_type, nullable = const_enum_data - synthetic_obj = self._create_synthetic_enum_obj( - item, enum_values, varnames, descriptions, enum_type, nullable - ) - if self.should_parse_enum_as_literal(synthetic_obj, property_name=name, property_obj=item): - return self.parse_enum_as_literal(synthetic_obj) - return self.parse_enum(name, synthetic_obj, get_special_path("enum", path), singular_name=singular_name) + if combined_const_enum := self._parse_combined_const_enum( + name, + item, + item.oneOf, + get_special_path("enum", path), + singular_name=singular_name, + ): + return combined_const_enum return self.data_type(data_types=self.parse_one_of(name, item, get_special_path("oneOf", path)))Also applies to: 4152-4161
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/datamodel_code_generator/parser/jsonschema.py` around lines 4141 - 4150, Replace the duplicated const-enum extraction/dispatch logic in the anyOf/oneOf branches by calling the existing helper _parse_combined_const_enum and returning its result when present; specifically, instead of re-running _extract_const_enum_from_combined / _create_synthetic_enum_obj and then calling should_parse_enum_as_literal / parse_enum_as_literal / parse_enum, invoke self._parse_combined_const_enum(...) with the same inputs (item.anyOf or item.oneOf, item.type, name, item, path, singular_name as needed) and if it returns a non-None value return that, otherwise fall back to the existing data_type(...) with self.parse_any_of(...) (or self.parse_one_of(...)) so you remove duplicated logic around _extract_const_enum_from_combined, _create_synthetic_enum_obj, should_parse_enum_as_literal, parse_enum_as_literal, and parse_enum.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/datamodel_code_generator/parser/jsonschema.py`:
- Around line 4613-4624: When building enum member names in the block inside
parser/jsonschema.py (the branch that sets default and field_name when obj.type
!= "string"), handle enum_part == None specially: if enum_part is None set
default = None (a real Python None) and set field_name to a stable "null" token
(e.g. f"{prefix}_null" or just "null") instead of using Python's "None" repr;
update the branch that currently computes field_name (the else branch that calls
_get_field_name_from_dict_enum and uses prefix = obj.type ...) so it checks "if
enum_part is None" first and returns a "null"-based name and None default to
ensure nullable non-string const-enums are represented as optional values rather
than creating members like integer_None.
---
Nitpick comments:
In `@src/datamodel_code_generator/parser/jsonschema.py`:
- Around line 4141-4150: Replace the duplicated const-enum extraction/dispatch
logic in the anyOf/oneOf branches by calling the existing helper
_parse_combined_const_enum and returning its result when present; specifically,
instead of re-running _extract_const_enum_from_combined /
_create_synthetic_enum_obj and then calling should_parse_enum_as_literal /
parse_enum_as_literal / parse_enum, invoke self._parse_combined_const_enum(...)
with the same inputs (item.anyOf or item.oneOf, item.type, name, item, path,
singular_name as needed) and if it returns a non-None value return that,
otherwise fall back to the existing data_type(...) with self.parse_any_of(...)
(or self.parse_one_of(...)) so you remove duplicated logic around
_extract_const_enum_from_combined, _create_synthetic_enum_obj,
should_parse_enum_as_literal, parse_enum_as_literal, and parse_enum.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: Path: .coderabbit.yaml
Review profile: CHILL
Plan: Pro
Run ID: 46d744de-2729-4581-80c9-1669d7fee1e2
📒 Files selected for processing (1)
src/datamodel_code_generator/parser/jsonschema.py
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src/datamodel_code_generator/parser/jsonschema.py (1)
4613-4624:
⚠️ Potential issue | 🟠 Major | ⚡ Quick winNullable non-string const-enums can be emitted with a real
Noneenum member.When combined const-enum extraction includes a nullable branch, non-string enums can flow here with
Nonestill present, producing members likeinteger_Noneinstead of optional enum behavior. This conflicts with the nullable const-enum contract validated bytests/main/jsonschema/test_main_jsonschema.pyandtests/data/expected/main/jsonschema/oneof_const_enum_nullable.py.🐛 Suggested fix
def _get_enum_members_and_nullable(self, obj: JsonSchemaObject) -> tuple[list[Any], bool]: # noqa: PLR6301 - if None in obj.enum and obj.type == "string": - # Nullable is valid in only OpenAPI + if None in obj.enum: + # Treat `None` as nullable enum branch regardless of primitive subtype. return [e for e in obj.enum if e is not None], True return obj.enum, False🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/datamodel_code_generator/parser/jsonschema.py` around lines 4613 - 4624, When building enum member names in the block inside parser/jsonschema.py (the branch that sets default and field_name when obj.type != "string"), handle enum_part == None specially: if enum_part is None set default = None (a real Python None) and set field_name to a stable "null" token (e.g. f"{prefix}_null" or just "null") instead of using Python's "None" repr; update the branch that currently computes field_name (the else branch that calls _get_field_name_from_dict_enum and uses prefix = obj.type ...) so it checks "if enum_part is None" first and returns a "null"-based name and None default to ensure nullable non-string const-enums are represented as optional values rather than creating members like integer_None.
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…ethod-extraction # Conflicts: # tests/parser/test_jsonschema.py
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🧹 Nitpick comments (1)
tests/parser/test_jsonschema.py (1)
68-74: ⚡ Quick winConsider testing the symmetric incomplete case and the success path.
The test covers empty metadata and one incomplete case (module without name), but the test name suggests comprehensive coverage. Consider adding:
- The symmetric incomplete case:
{"name": "Status"}without module should also raise the same error.- The success path: Both module and name provided should return a validated path string.
🧪 Suggested additional test cases
def test_get_x_python_import_path_handles_empty_and_incomplete_metadata() -> None: """Test x-python-import accepts an empty object but rejects partial metadata.""" parser = JsonSchemaParser("") assert parser._get_x_python_import_path({}) is None with pytest.raises(Error, match="x-python-import requires both module and name"): parser._get_x_python_import_path({"module": "os"}) + with pytest.raises(Error, match="x-python-import requires both module and name"): + parser._get_x_python_import_path({"name": "Status"}) + + # Success path: both module and name provided + result = parser._get_x_python_import_path({"module": "myapp.enums", "name": "Status"}) + assert result == "myapp.enums.Status"🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@tests/parser/test_jsonschema.py` around lines 68 - 74, Update the test_get_x_python_import_path_handles_empty_and_incomplete_metadata test to also assert that the symmetric incomplete case (calling JsonSchemaParser._get_x_python_import_path with {"name": "Status"}) raises the same Error with message "x-python-import requires both module and name", and add a success assertion that providing both keys (e.g. {"module": "os", "name": "Path"}) returns the expected import path string (call the same parser._get_x_python_import_path and assert the returned value equals the validated path you expect). Ensure you reference the existing test function name and the JsonSchemaParser._get_x_python_import_path method when adding these assertions so they sit in the same test and cover empty, both incomplete permutations, and the valid case.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Nitpick comments:
In `@tests/parser/test_jsonschema.py`:
- Around line 68-74: Update the
test_get_x_python_import_path_handles_empty_and_incomplete_metadata test to also
assert that the symmetric incomplete case (calling
JsonSchemaParser._get_x_python_import_path with {"name": "Status"}) raises the
same Error with message "x-python-import requires both module and name", and add
a success assertion that providing both keys (e.g. {"module": "os", "name":
"Path"}) returns the expected import path string (call the same
parser._get_x_python_import_path and assert the returned value equals the
validated path you expect). Ensure you reference the existing test function name
and the JsonSchemaParser._get_x_python_import_path method when adding these
assertions so they sit in the same test and cover empty, both incomplete
permutations, and the valid case.
ℹ️ Review info
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Configuration used: Path: .coderabbit.yaml
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⛔ Files ignored due to path filters (1)
tests/data/jsonschema/oneof_const_enum_int_nullable.yamlis excluded by!tests/data/**/*.yamland included by none
📒 Files selected for processing (4)
src/datamodel_code_generator/parser/jsonschema.pytests/data/expected/main/jsonschema/oneof_const_enum_int_nullable.pytests/main/jsonschema/test_main_jsonschema.pytests/parser/test_jsonschema.py
✅ Files skipped from review due to trivial changes (1)
- tests/data/expected/main/jsonschema/oneof_const_enum_int_nullable.py
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- src/datamodel_code_generator/parser/jsonschema.py
Koudai Aono (koxudaxi)
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Koudai Aono (koxudaxi)
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Breaking Change AnalysisResult: No breaking changes detected Reasoning: NOTE: The prepared diff/context/deleted-lines files under /home/runner/work/_temp/release-draft-pr/ were inaccessible in this session — every access route (Read tool permission, Bash cat/cp/ls/python, and the gh PR-diff fallback) was blocked by the sandbox/permission layer, and the repo is a single root commit with no parent, so no git-derived diff was possible. Determination is therefore based on the merged commit metadata for PR #3355 rather than the line-level diff. The PR is titled "Fix nullable JSON Schema const enums" with squashed subcommits describing internal JSON Schema parser refactoring ("method bodies", "footprint", "method extraction edges", "x-python-import metadata paths") and "Scope nullable enum handling to combined schemas." This is a bug fix correcting generated output for a narrow edge case (nullable const enums in combined schemas) plus internal refactoring. No evidence of removed CLI options, removed/renamed public Python API symbols, Jinja2 template contract changes, dropped Python versions, or a default-behavior flip affecting previously-correct output. Such edge-case output fixes are recorded as fixes, not breaking changes, under this project's CHANGELOG conventions. Caveat: because line-level removals could not be inspected, a breaking change cannot be ruled out with full certainty, but no available evidence indicates one. This analysis was performed by Claude Code Action |
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🎉 Released in 0.64.0 This PR is now available in the latest release. See the release notes for details. |
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