crud-gen

name	crud-gen
description	Generate production-ready FastAPI CRUD endpoints with SQLModel. Creates complete Create, Read, Update, Delete operations following project patterns.

FastAPI CRUD Generator

Purpose

Auto-scaffold complete CRUD endpoints for SQLModel entities with pagination, validation, error handling, and proper session management.

Core Rules

1. Context7 First: Query /websites/fastapi_tiangolo and /websites/sqlmodel_tiangolo for latest patterns
2. uv Only: Never suggest pip commands
3. Async Pattern: All operations use async def with proper session handling
4. Type Safety: Use Python 3.10+ union types (int | None) and Annotated
5. Response Models: Separate Create, Update, Public schemas

Workflow

1. Analyze Target: Identify SQLModel entity to scaffold

2. Query Docs: Fetch Context7 patterns for FastAPI + SQLModel CRUD

3. Generate Schemas:

   class TodoBase(SQLModel):
       title: str = Field(max_length=200, index=True)
       description: str | None = None
   
   class TodoCreate(TodoBase):
       pass
   
   class TodoUpdate(SQLModel):
       title: str | None = None
       description: str | None = None
       status: TodoStatus | None = None
   
   class TodoPublic(TodoBase):
       id: int
       status: TodoStatus
       created_at: datetime
   

4. Generate Endpoints:

   • POST /{resource}/ - Create with validation
   • GET /{resource}/ - List with pagination (offset, limit ≤100)
   • GET /{resource}/{id} - Get by ID with 404 handling
   • PATCH /{resource}/{id} - Partial update with model_dump(exclude_unset=True)
   • DELETE /{resource}/{id} - Soft or hard delete

5. Add Dependencies:

   SessionDep = Annotated[Session, Depends(get_session)]
   

6. Include Error Handling:

   • 404 for not found
   • 422 for validation errors
   • Proper session commit/rollback

Output Format

• Complete router file with all 5 CRUD operations
• Includes imports, schemas, and endpoints
• Ready to integrate into existing FastAPI app

Example Usage

User: "Generate CRUD for the Todo model" Action: Query Context7 → Generate TodoCreate, TodoUpdate, TodoPublic → Create 5 endpoints → Return complete code

Quality Checks

• ✓ All endpoints use SessionDep
• ✓ Pagination on list (default limit=100, max=100)
• ✓ HTTPException for 404 errors
• ✓ model_validate() for create
• ✓ model_dump(exclude_unset=True) for update
• ✓ session.refresh() after mutations