🟢 RISK: LOW
All public HTTP routes, payloads, and status codes unchanged. Breaking changes confined to internal Python method names.
File Diffs — src/user_model.py
| # | Rule | Change |
|---|
| 1 | Imports | from pydantic import validator, root_validatorfrom pydantic import field_validator, model_validator, ConfigDict |
| 2 | regex → pattern | Field(..., regex=r'^\d{5}(-\d{4})?$')Field(..., pattern=r'^\d{5}(-\d{4})?$') |
| 3 | min_items → min_length | Field(default_factory=list, min_items=1)Field(default_factory=list, min_length=1) |
| 4 | Address config | class Config: str_strip_whitespace=True, allow_mutation=Falsemodel_config = ConfigDict(str_strip_whitespace=True, frozen=True) |
| 5 | UserModel config | class Config: str_strip_whitespace, orm_mode=True, extra='forbid'model_config = ConfigDict(str_strip_whitespace=True, from_attributes=True, extra='forbid') |
| 6 | @validator → @field_validator | @validator('username') / @validator('role')@field_validator('username') + @classmethod / @field_validator('role') + @classmethod |
| 7 | @root_validator → @model_validator | @root_validator(pre=True)@model_validator(mode='before') + @classmethod |
| 8 | Syntax fix | def to_compact_dict((self) ← stray parenthesisdef to_compact_dict(self) |
| 9 | .dict() → .model_dump() | self.dict(exclude_unset=True, exclude_none=True)self.model_dump(exclude_unset=True, exclude_none=True) |
| 10 | .copy() → .model_copy() | self.copy(update={"role": new_role})self.model_copy(update={"role": new_role}) |
| 11 | parse_raw → model_validate_json | cls.parse_raw(json_str)cls.model_validate_json(json_str) |
| 12 | parse_obj → model_validate | cls.parse_obj(obj)cls.model_validate(obj) |
File Diffs — src/config_model.py
| # | Rule | Change |
|---|
| 1 | Imports | from pydantic import validatorfrom pydantic import field_validator, ConfigDict |
| 2 | SecuritySettings config | class Config: allow_mutation=False, extra='forbid'model_config = ConfigDict(frozen=True, extra='forbid') |
| 3 | AppConfig config | class Config: str_strip_whitespace, allow_mutation=False, orm_mode=Truemodel_config = ConfigDict(str_strip_whitespace=True, frozen=True, from_attributes=True) |
| 4 | @validator → @field_validator | @validator('environment')@field_validator('environment') + @classmethod |
| 5 | .dict() → .model_dump() | self.dict()self.model_dump() |
| 6 | parse_obj → model_validate | cls.parse_obj(data)cls.model_validate(data) |
File Diffs — src/api_service.py
| # | Rule | Change |
|---|
| 1 | Framework import | from flask import Flask, request, jsonifyfrom fastapi import FastAPI, Header, HTTPException, status |
| 2 | App init | app = Flask(__name__)app = FastAPI(title="Migrated Modern API") |
| 3 | GET route | @app.route('/health', methods=['GET'])@app.get('/health') |
| 4 | POST routes + status | @app.route('/api/v1/users', methods=['POST'])@app.post('/api/v1/users', status_code=201) |
| 5 | Path param syntax | /api/v1/users/<int:user_id>/promote/api/v1/users/{user_id}/promote |
| 6 | Header injection | api_key = request.headers.get('X-API-Key')x_api_key: Optional[str] = Header(None) |
| 7 | Body injection | raw_data = request.get_json(); UserModel.parse_from_dict_obj(raw_data)payload: UserModel (FastAPI dependency injection) |
| 8 | Error responses | return jsonify({"detail": "..."}), 4xxraise HTTPException(status_code=4xx, detail="...") |
| 9 | Success responses | return jsonify({...}), 200/201return {...} (plain dict) |
mypy Static Analysis
$ python -m mypy src/ --ignore-missing-imports
Success: no issues found in 4 source files
Performance Benchmark
$ python -m tests.benchmark
--- BENCHMARK RESULTS ---
Total Iterations: 10,000
Total Execution Time: 0.1693 seconds
Throughput: 59,076.80 ops/sec
pytest Execution Log
$ python -m pytest tests/ -v
============================= test session starts =============================
platform win32 -- Python 3.9.5, pytest-8.4.2, pluggy-1.6.0
rootdir: C:\Users\MIS\BobMigrate
plugins: anyio-4.12.1
collected 6 items
tests/test_api.py::test_health_check PASSED [ 16%]
tests/test_api.py::test_create_user_flow PASSED [ 33%]
tests/test_api.py::test_config_validation_endpoint PASSED [ 50%]
tests/test_models.py::test_user_model_legacy_features PASSED [ 66%]
tests/test_models.py::test_user_model_validation_failures PASSED [ 83%]
tests/test_models.py::test_config_model_sanitization PASSED [100%]
============================== 6 passed in 1.48s ==============================
Git Audit
$ git log --oneline
9ef96e6 (HEAD -> feature/bobmigrate-modernization)
refactor(core): automated Pydantic v2 & FastAPI modernization via BobMigrate
17 files changed, 363 insertions(+)
src/api_service.py · src/config_model.py · src/user_model.py
tests/benchmark.py · tests/test_api.py · tests/test_models.py
docs/flask_to_fastapi_guide.md · docs/pydantic_v1_to_v2_guide.md
requirements.txt