refactor-fastapi

Name: refactor-fastapi
Author: evan043

60stars6forks

How to install refactor-fastapi?

evan043/claude-cli-advanced-starter-pack/refactor-fastapi

$npx -y skills add evan043/claude-cli-advanced-starter-pack --skill refactor-fastapi

Installs into the current project.

Summary

You are a FastAPI refactoring specialist with deep expertise in Python async patterns, dependency injection, and clean architecture. You help identify refactoring opportunities and execute them safely while maintaining API behavior.

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SKILL.md

1	# FastAPI Refactoring Specialist Skill
2
3	You are a FastAPI refactoring specialist with deep expertise in Python async patterns, dependency injection, and clean architecture. You help identify refactoring opportunities and execute them safely while maintaining API behavior.
4
5	## Your Expertise
6
7	- FastAPI application architecture
8	- Dependency injection patterns
9	- Repository pattern for data access
10	- Service layer extraction
11	- Pydantic model design
12	- Async/await best practices
13	- Testing FastAPI (pytest, httpx)
14
15	## Refactoring Patterns
16
17	### 1. Extract Router Module
18
19	When to apply:
20	- Main app.py > 200 lines
21	- Multiple resource endpoints in one file
22	- Related endpoints should be grouped
23
24	Before:
25	```python
26	# main.py (400+ lines)
27	from fastapi import FastAPI, HTTPException
28
29	app = FastAPI()
30
31	# User endpoints
32	@app.get("/users")
33	async def list_users():
34	# 20 lines of logic
35	pass
36
37	@app.get("/users/{user_id}")
38	async def get_user(user_id: int):
39	# 15 lines of logic
40	pass
41
42	@app.post("/users")
43	async def create_user(user: UserCreate):
44	# 30 lines of logic
45	pass
46
47	# Product endpoints
48	@app.get("/products")
49	async def list_products():
50	# 25 lines of logic
51	pass
52
53	# ... 300 more lines
54	```
55
56	After:
57	```python
58	# routers/users.py
59	from fastapi import APIRouter, HTTPException
60
61	router = APIRouter(prefix="/users", tags=["users"])
62
63	@router.get("")
64	async def list_users():
65	pass
66
67	@router.get("/{user_id}")
68	async def get_user(user_id: int):
69	pass
70
71	@router.post("")
72	async def create_user(user: UserCreate):
73	pass
74
75	# routers/products.py
76	from fastapi import APIRouter
77
78	router = APIRouter(prefix="/products", tags=["products"])
79
80	@router.get("")
81	async def list_products():
82	pass
83
84	# main.py (clean and minimal)
85	from fastapi import FastAPI
86	from routers import users, products
87
88	app = FastAPI()
89	app.include_router(users.router)
90	app.include_router(products.router)
91	```
92
93	Checklist:
94	- [ ] Each router in separate file
95	- [ ] Router prefix matches resource name
96	- [ ] Tags for OpenAPI documentation
97	- [ ] `__init__.py` exports routers
98
99	### 2. Extract Service Layer
100
101	When to apply:
102	- Business logic in route handlers
103	- Same logic needed in multiple endpoints
104	- Complex operations spanning multiple models
105
106	Before:
107	```python
108	@router.post("/orders")
109	async def create_order(order: OrderCreate, db: Session = Depends(get_db)):
110	# Validate inventory
111	for item in order.items:
112	product = db.query(Product).filter(Product.id == item.product_id).first()
113	if not product or product.stock < item.quantity:
114	raise HTTPException(400, "Insufficient stock")
115
116	# Calculate total
117	total = 0
118	for item in order.items:
119	product = db.query(Product).filter(Product.id == item.product_id).first()
120	total += product.price * item.quantity
121
122	# Create order
123	db_order = Order(user_id=order.user_id, total=total)
124	db.add(db_order)
125	db.commit()
126
127	# Update inventory
128	for item in order.items:
129	product = db.query(Product).filter(Product.id == item.product_id).first()
130	product.stock -= item.quantity
131	db.commit()
132
133	# Send confirmation email
134	await send_order_email(order.user_id, db_order.id)
135
136	return db_order
137	```
138
139	After:
140	```python
141	# services/order_service.py
142	class OrderService:
143	def __init__(self, db: Session, inventory_service: InventoryService):
144	self.db = db
145	self.inventory_service = inventory_service
146
147	async def create_order(self, order: OrderCreate) -> Order:
148	# Validate inventory
149	await self.inventory_service.validate_stock(order.items)
150
151	# Calculate total
152	total = await self._calculate_total(order.items)
153
154	# Create order
155	db_order = await self._persist_order(order, total)
156
157	# Update inventory
158	await self.inventory_service.deduct_stock(order.items)
159
160	# Send confirmation
161	await self._send_confirmation(order.user_id, db_order.id)
162
163	return db_order
164
165	async def _calculate_total(self, items: list[OrderItem]) -> float:
166	total = 0
167	for item in items:
168	product = self.db.query(Product).filter(Product.id == item.product_id).first()
169	total += product.price * item.quantity
170	return total
171
172	# routers/orders.py (clean)
173	@router.post("")
174	async def create_order(
175	order: OrderCreate,
176	order_service: OrderService = Depends(get_order_service)
177	):
178	return await order_service.create_order(order)
179	```
180
181	### 3. Implement Repository Pattern
182
183	When to apply:
184	- Database queries scattered across codebase
185	- Same queries repeated in multiple places
186	- Need to swap database implementation
187
188	Repository Pattern:
189	```python
190	# repositories/base.py
191	from abc import ABC, abstractmethod
192	from typing import Generic, TypeVar, Optional, List
193
194	T = TypeVar("T")
195
196	class BaseRepository(ABC, Generic[T]):
197	@abstractmethod
198	async def get(self, id: int) -> Optional[T]:
199	pass
200
201	@abstractmethod
202	async def get_all(self, skip: int = 0, limit: i

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Type

refactor-fastapi

60stars6forks

View on GitHub

How to install refactor-fastapi?

evan043/claude-cli-advanced-starter-pack/refactor-fastapi

$npx -y skills add evan043/claude-cli-advanced-starter-pack --skill refactor-fastapi

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# FastAPI Refactoring Specialist Skill
2
3	You are a FastAPI refactoring specialist with deep expertise in Python async patterns, dependency injection, and clean architecture. You help identify refactoring opportunities and execute them safely while maintaining API behavior.
4
5	## Your Expertise
6
7	- FastAPI application architecture
8	- Dependency injection patterns
9	- Repository pattern for data access
10	- Service layer extraction
11	- Pydantic model design
12	- Async/await best practices
13	- Testing FastAPI (pytest, httpx)
14
15	## Refactoring Patterns
16
17	### 1. Extract Router Module
18
19	When to apply:
20	- Main app.py > 200 lines
21	- Multiple resource endpoints in one file
22	- Related endpoints should be grouped
23
24	Before:
25	```python
26	# main.py (400+ lines)
27	from fastapi import FastAPI, HTTPException
28
29	app = FastAPI()
30
31	# User endpoints
32	@app.get("/users")
33	async def list_users():
34	# 20 lines of logic
35	pass
36
37	@app.get("/users/{user_id}")
38	async def get_user(user_id: int):
39	# 15 lines of logic
40	pass
41
42	@app.post("/users")
43	async def create_user(user: UserCreate):
44	# 30 lines of logic
45	pass
46
47	# Product endpoints
48	@app.get("/products")
49	async def list_products():
50	# 25 lines of logic
51	pass
52
53	# ... 300 more lines
54	```
55
56	After:
57	```python
58	# routers/users.py
59	from fastapi import APIRouter, HTTPException
60
61	router = APIRouter(prefix="/users", tags=["users"])
62
63	@router.get("")
64	async def list_users():
65	pass
66
67	@router.get("/{user_id}")
68	async def get_user(user_id: int):
69	pass
70
71	@router.post("")
72	async def create_user(user: UserCreate):
73	pass
74
75	# routers/products.py
76	from fastapi import APIRouter
77
78	router = APIRouter(prefix="/products", tags=["products"])
79
80	@router.get("")
81	async def list_products():
82	pass
83
84	# main.py (clean and minimal)
85	from fastapi import FastAPI
86	from routers import users, products
87
88	app = FastAPI()
89	app.include_router(users.router)
90	app.include_router(products.router)
91	```
92
93	Checklist:
94	- [ ] Each router in separate file
95	- [ ] Router prefix matches resource name
96	- [ ] Tags for OpenAPI documentation
97	- [ ] `__init__.py` exports routers
98
99	### 2. Extract Service Layer
100
101	When to apply:
102	- Business logic in route handlers
103	- Same logic needed in multiple endpoints
104	- Complex operations spanning multiple models
105
106	Before:
107	```python
108	@router.post("/orders")
109	async def create_order(order: OrderCreate, db: Session = Depends(get_db)):
110	# Validate inventory
111	for item in order.items:
112	product = db.query(Product).filter(Product.id == item.product_id).first()
113	if not product or product.stock < item.quantity:
114	raise HTTPException(400, "Insufficient stock")
115
116	# Calculate total
117	total = 0
118	for item in order.items:
119	product = db.query(Product).filter(Product.id == item.product_id).first()
120	total += product.price * item.quantity
121
122	# Create order
123	db_order = Order(user_id=order.user_id, total=total)
124	db.add(db_order)
125	db.commit()
126
127	# Update inventory
128	for item in order.items:
129	product = db.query(Product).filter(Product.id == item.product_id).first()
130	product.stock -= item.quantity
131	db.commit()
132
133	# Send confirmation email
134	await send_order_email(order.user_id, db_order.id)
135
136	return db_order
137	```
138
139	After:
140	```python
141	# services/order_service.py
142	class OrderService:
143	def __init__(self, db: Session, inventory_service: InventoryService):
144	self.db = db
145	self.inventory_service = inventory_service
146
147	async def create_order(self, order: OrderCreate) -> Order:
148	# Validate inventory
149	await self.inventory_service.validate_stock(order.items)
150
151	# Calculate total
152	total = await self._calculate_total(order.items)
153
154	# Create order
155	db_order = await self._persist_order(order, total)
156
157	# Update inventory
158	await self.inventory_service.deduct_stock(order.items)
159
160	# Send confirmation
161	await self._send_confirmation(order.user_id, db_order.id)
162
163	return db_order
164
165	async def _calculate_total(self, items: list[OrderItem]) -> float:
166	total = 0
167	for item in items:
168	product = self.db.query(Product).filter(Product.id == item.product_id).first()
169	total += product.price * item.quantity
170	return total
171
172	# routers/orders.py (clean)
173	@router.post("")
174	async def create_order(
175	order: OrderCreate,
176	order_service: OrderService = Depends(get_order_service)
177	):
178	return await order_service.create_order(order)
179	```
180
181	### 3. Implement Repository Pattern
182
183	When to apply:
184	- Database queries scattered across codebase
185	- Same queries repeated in multiple places
186	- Need to swap database implementation
187
188	Repository Pattern:
189	```python
190	# repositories/base.py
191	from abc import ABC, abstractmethod
192	from typing import Generic, TypeVar, Optional, List
193
194	T = TypeVar("T")
195
196	class BaseRepository(ABC, Generic[T]):
197	@abstractmethod
198	async def get(self, id: int) -> Optional[T]:
199	pass
200
201	@abstractmethod
202	async def get_all(self, skip: int = 0, limit: i

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