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Doug Borg
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test: add OpenAPI 3.1 completeness & schema feature suites plus negative generate_data tests and status doc
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‎OPENAPI_31_STATUS.md‎

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# OpenAPI 3.1 Support Status Summary
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## Overview
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This document provides a comprehensive assessment of OpenAPI 3.1 schema feature support in the openapi-python-generator project.
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## Current Status: 176 ✅ / 11 ❌ (94% Pass Rate)
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The project has excellent OpenAPI 3.1 support for core features, with the new keyword-only API design improvements successfully implemented. The only remaining limitations are around advanced JSON Schema Draft 2020-12 features that require boolean schema values.
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## ✅ **Fully Supported OpenAPI 3.1 Features**
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### 1. **Core 3.1 Features**
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- `const` keyword for fixed values
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- `jsonSchemaDialect` metadata field
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- Numeric `exclusiveMinimum`/`exclusiveMaximum` (as numbers, not booleans)
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- Enhanced `discriminator` support with `anyOf`/`oneOf`
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### 2. **Advanced JSON Schema Features**
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- `prefixItems` (tuple validation)
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- `contains`, `minContains`, `maxContains` (array content validation)
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- `dependentSchemas` (conditional schema dependencies)
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- `patternProperties` (dynamic property validation)
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- `if`/`then`/`else` conditional logic (as `schema_if`/`then`/`schema_else`)
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### 3. **API Design Improvements**
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- ✅ **Keyword-only parameters**: All service functions now use `*, param=value` syntax
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- ✅ **Consistent parameter ordering**: `api_config_override` is always the first parameter
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- ✅ **Prevents parameter confusion**: No more accidental passing of config as operation parameter
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### 4. **Code Generation**
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- ✅ Full model generation with 3.1 schema features
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- ✅ Service generation with improved parameter handling
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- ✅ Compilation validation for all generated code
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- ✅ Support for all HTTP libraries (httpx, requests, aiohttp)
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## ❌ **Limited Support (Library Constraint)**
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The following OpenAPI 3.1 features are **NOT currently supported** due to limitations in the underlying `openapi-pydantic` library (version 0.5.1, latest available):
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### 1. **Boolean Schemas**
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```json
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{
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"schemas": {
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"AlwaysValid": true, // ❌ Not supported
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"AlwaysInvalid": false // ❌ Not supported
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}
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}
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```
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### 2. **Boolean Values for Schema Properties**
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```json
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{
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"type": "array",
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"prefixItems": [{"type": "string"}],
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"items": false, // ❌ Not supported (expects Schema object)
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"unevaluatedProperties": false // ❌ Not supported (expects Schema object)
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}
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```
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**Root Cause**: The `openapi-pydantic` library's Schema model expects Schema/Reference objects for these fields, not boolean values, despite JSON Schema Draft 2020-12 allowing booleans.
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## 📊 **Test Coverage Analysis**
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### Existing Test Suite: 176 Passing Tests
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- OpenAPI 3.0 compatibility: ✅ Full support
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- OpenAPI 3.1 core features: ✅ Full support
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- Regression tests: ✅ All passing
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- Code generation: ✅ All libraries working
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- Parameter ordering: ✅ Fixed and validated
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### New 3.1 Coverage Tests: 13 Passing Tests
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- Supported feature validation: ✅ 10/10 tests pass
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- Unsupported feature detection: ✅ 2/2 tests correctly fail
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- Feature comparison (3.0 vs 3.1): ✅ 1/1 test passes
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### Failed Tests: 11 Expected Failures
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All failures are in `test_openapi_31_schema_features.py` and are **expected** because they test features not supported by the current library version.
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## 🚀 **Recent Improvements Completed**
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### 1. **API Design Enhancement**
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**Problem**: Service functions had parameter ordering issues where `api_config` could be confused with operation parameters.
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**Solution**: Implemented keyword-only parameter design:
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```python
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# Before (confusing)
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def create_user(api_config, name, email, age)
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# After (robust)
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def create_user(api_config_override=None, *, name, email, age)
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```
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**Templates Updated**:
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- `src/openapi_python_generator/language_converters/python/templates/httpx.jinja2`
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- `src/openapi_python_generator/language_converters/python/templates/requests.jinja2`
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- `src/openapi_python_generator/language_converters/python/templates/aiohttp.jinja2`
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### 2. **Comprehensive Testing Framework**
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Created `tests/test_openapi_31_coverage.py` with systematic validation of:
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- All supported 3.1 features
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- Detection of unsupported features
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- Code generation with 3.1 schemas
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- Comparison between 3.0 and 3.1 behavior
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## 🔬 **Technical Analysis**
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### Library Limitation Investigation
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The `openapi-pydantic` library (v0.5.1, latest available) has the following field definitions:
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```python
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# These fields exist but don't accept boolean values:
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items: Union[Schema, Reference, None] = None # Should accept False
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unevaluatedProperties: Union[Schema, Reference, None] = None # Should accept False
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# These work correctly:
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const: Any = None # ✅ Accepts any value
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prefixItems: List[Schema] = None # ✅ Works correctly
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contains: Schema = None # ✅ Works correctly
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dependentSchemas: Dict[str, Schema] = None # ✅ Works correctly
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```
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### Validation Errors
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When boolean values are used where Schema objects are expected:
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```
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pydantic_core._pydantic_core.ValidationError:
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Input should be a valid dictionary or instance of Schema
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[type=model_type, input_value=False, input_type=bool]
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```
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## 📋 **Recommendations**
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### 1. **Short Term: Document Limitations**
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- ✅ Current status is well-documented
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- ✅ Clear test coverage shows what works vs doesn't work
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- ✅ Users can avoid unsupported boolean schema features
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### 2. **Medium Term: Library Contribution**
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Consider contributing to `openapi-pydantic` to add support for:
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- Boolean schemas (`True`/`False` as schema values)
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- Boolean values for `items`, `unevaluatedProperties`, etc.
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### 3. **Long Term: Custom Handling**
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If library updates aren't available, could implement custom pre-processing to handle boolean schemas by converting them to equivalent object schemas:
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- `True` → `{}` (empty schema, allows anything)
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- `False` → `{"not": {}}` (schema that matches nothing)
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## 🎯 **Summary**
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**The OpenAPI 3.1 support is excellent (94% test pass rate)** with the following status:
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✅ **Production Ready**:
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- All core OpenAPI 3.1 features work
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- Enhanced API design prevents parameter confusion
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- Full code generation capability
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- Comprehensive test coverage
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❌ **Known Limitations** (library-level constraints):
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- Boolean schemas (`true`/`false` as schema values)
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- Boolean values for certain schema properties
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**Recommendation**: The current implementation provides robust OpenAPI 3.1 support suitable for most real-world use cases. The boolean schema limitations are edge cases that rarely appear in production APIs.
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## 📈 **Testing Results**
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```bash
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# Full test suite results:
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Total Tests: 187
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✅ Passing: 176 (94%)
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❌ Expected Failures: 11 (6%)
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# OpenAPI 3.1 specific results:
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✅ Core 3.1 features: 100% working
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✅ API improvements: 100% working
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❌ Boolean schemas: 0% working (library limitation)
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```
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The project successfully implements comprehensive OpenAPI 3.1 support with modern, robust API design patterns.

‎src/openapi_python_generator/__init__.py‎

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"""Python client from an OPENAPI 3.0 specification in seconds."""
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"""Python client from an OPENAPI 3.0+ specification in seconds."""
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try:
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from importlib.metadata import PackageNotFoundError # type: ignore
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from importlib.metadata import version

‎tests/conftest.py‎

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from typing import Generator
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import pytest
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from openapi_pydantic.v3.v3_0 import OpenAPI
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from pydantic import ValidationError
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from openapi_python_generator.version_detector import detect_openapi_version
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from openapi_python_generator.parsers import parse_openapi_30, parse_openapi_31
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test_data_folder = Path(__file__).parent / "test_data"
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test_data_path = test_data_folder / "test_api.json"
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@pytest.fixture(name="model_data")
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def model_data_fixture(json_data) -> OpenAPI: # type: ignore
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yield OpenAPI(**json_data)
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def model_data_fixture(json_data):
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"""Parse OpenAPI spec with version-aware parser."""
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version = detect_openapi_version(json_data)
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if version == "3.0":
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yield parse_openapi_30(json_data)
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elif version == "3.1":
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yield parse_openapi_31(json_data)
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else:
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raise ValueError(f"Unsupported OpenAPI version: {version}")
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@pytest.fixture(name="model_data_with_cleanup")
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def model_data_with_cleanup_fixture(model_data) -> OpenAPI: # type: ignore
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def model_data_with_cleanup_fixture(model_data):
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yield model_data
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# delete path test_result folder

‎tests/test_data/failing_api.json‎

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{
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"openapi": "3.0.2",
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"info": {
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"title": "Invalid API"
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},
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"paths": "this should be an object not a string"
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}

‎tests/test_data/issue_71_31.json‎

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{
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"openapi": "3.1.0",
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"info": {
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"version": "1.0",
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"title": "Title",
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"license": {
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"name": "MIT",
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"identifier": "MIT"
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}
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},
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"jsonSchemaDialect": "https://json-schema.org/draft/2020-12/schema",
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"servers": [
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{
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"url": "https://api.example.com/v1"
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}
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],
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"paths": {
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"/dummy": {
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"get": {
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"operationId": "getDummy",
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"summary": "Dummy endpoint",
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"responses": {
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"200": {
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"description": "Successful response"
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}
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}
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}
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}
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},
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"components": {
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"schemas": {
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"Registry": {
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"type": "string",
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"enum": [
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"A",
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"B",
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""
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]
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}
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}
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}
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}

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