Add Task Manager API with FastAPI and SQLite

- Created FastAPI application structure with main.py
- Implemented SQLAlchemy models for tasks with priority and completion status
- Set up database connection with SQLite using absolute paths
- Created Alembic migrations for database schema
- Added CRUD operations for task management
- Implemented health check and root endpoints
- Added CORS configuration for cross-origin requests
- Created comprehensive API documentation
- Added Ruff configuration for code linting
- Updated README with installation and usage instructions

README.md

@@ -1,3 +1,64 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple task management API built with FastAPI and SQLite.
+
+## Features
+
+- Create, read, update, and delete tasks
+- Task priority levels (low, medium, high)
+- Task completion status tracking
+- Automatic timestamps for creation and updates
+- Health check endpoint
+- Interactive API documentation
+
+## Installation
+
+1. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+2. Run database migrations:
+```bash
+alembic upgrade head
+```
+
+3. Start the application:
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at `http://localhost:8000`
+
+## API Endpoints
+
+- `GET /` - Root endpoint with API information
+- `GET /health` - Health check endpoint
+- `GET /docs` - Interactive API documentation (Swagger UI)
+- `GET /redoc` - Alternative API documentation
+- `POST /tasks/` - Create a new task
+- `GET /tasks/` - List all tasks (with pagination)
+- `GET /tasks/{task_id}` - Get a specific task
+- `PUT /tasks/{task_id}` - Update a task
+- `DELETE /tasks/{task_id}` - Delete a task
+
+## Task Schema
+
+```json
+{
+  "title": "string",
+  "description": "string (optional)",
+  "completed": false,
+  "priority": "medium"
+}
+```
+
+Priority levels: `low`, `medium`, `high`
+
+## Database
+
+The application uses SQLite with the database file stored at `/app/storage/db/db.sqlite`.
+
+## Environment Variables
+
+No environment variables are required for basic operation. The application uses SQLite with default settings.

alembic.ini

@@ -0,0 +1,41 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

@@ -0,0 +1,52 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+
+from app.db.base import Base
+from app.models.task import Task
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+def run_migrations_offline() -> None:
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

alembic/versions/001_create_tasks_table.py

@@ -0,0 +1,36 @@
+"""Create tasks table
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table('tasks',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('title', sa.String(length=255), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('completed', sa.Boolean(), nullable=False),
+    sa.Column('priority', sa.String(length=20), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_tasks_id'), 'tasks', ['id'], unique=False)
+    op.create_index(op.f('ix_tasks_title'), 'tasks', ['title'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_tasks_title'), table_name='tasks')
+    op.drop_index(op.f('ix_tasks_id'), table_name='tasks')
+    op.drop_table('tasks')

app/crud/task.py

@@ -0,0 +1,34 @@
+from sqlalchemy.orm import Session
+from app.models.task import Task as TaskModel
+from app.schemas.task import TaskCreate, TaskUpdate
+
+def create_task(db: Session, task: TaskCreate):
+    db_task = TaskModel(**task.dict())
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+def get_tasks(db: Session, skip: int = 0, limit: int = 100):
+    return db.query(TaskModel).offset(skip).limit(limit).all()
+
+def get_task(db: Session, task_id: int):
+    return db.query(TaskModel).filter(TaskModel.id == task_id).first()
+
+def update_task(db: Session, task_id: int, task: TaskUpdate):
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task:
+        update_data = task.dict(exclude_unset=True)
+        for field, value in update_data.items():
+            setattr(db_task, field, value)
+        db.commit()
+        db.refresh(db_task)
+    return db_task
+
+def delete_task(db: Session, task_id: int):
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task:
+        db.delete(db_task)
+        db.commit()
+        return True
+    return False

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,27 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+from app.db.base import Base
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+def create_tables():
+    Base.metadata.create_all(bind=engine)

app/models/task.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean
+from sqlalchemy.sql import func
+from app.db.base import Base
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    completed = Column(Boolean, default=False, nullable=False)
+    priority = Column(String(20), default="medium", nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

app/schemas/task.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    completed: bool = False
+    priority: str = "medium"
+
+class TaskCreate(TaskBase):
+    pass
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    completed: Optional[bool] = None
+    priority: Optional[str] = None
+
+class Task(TaskBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True

main.py

@@ -0,0 +1,72 @@
+from fastapi import FastAPI, HTTPException, Depends
+from fastapi.middleware.cors import CORSMiddleware
+from sqlalchemy.orm import Session
+from typing import List
+import os
+from pathlib import Path
+
+from app.db.session import get_db
+from app.models.task import Task as TaskModel
+from app.schemas.task import Task, TaskCreate, TaskUpdate
+from app.crud.task import create_task, get_tasks, get_task, update_task, delete_task
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A simple task management API built with FastAPI",
+    version="1.0.0"
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+@app.get("/")
+async def root():
+    return {
+        "title": "Task Manager API",
+        "description": "A simple task management API built with FastAPI",
+        "version": "1.0.0",
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "service": "Task Manager API"}
+
+@app.post("/tasks/", response_model=Task)
+async def create_new_task(task: TaskCreate, db: Session = Depends(get_db)):
+    return create_task(db=db, task=task)
+
+@app.get("/tasks/", response_model=List[Task])
+async def read_tasks(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    return get_tasks(db=db, skip=skip, limit=limit)
+
+@app.get("/tasks/{task_id}", response_model=Task)
+async def read_task(task_id: int, db: Session = Depends(get_db)):
+    db_task = get_task(db=db, task_id=task_id)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+@app.put("/tasks/{task_id}", response_model=Task)
+async def update_existing_task(task_id: int, task: TaskUpdate, db: Session = Depends(get_db)):
+    db_task = update_task(db=db, task_id=task_id, task=task)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+@app.delete("/tasks/{task_id}")
+async def delete_existing_task(task_id: int, db: Session = Depends(get_db)):
+    success = delete_task(db=db, task_id=task_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return {"message": "Task deleted successfully"}
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)

requirements.txt

@@ -0,0 +1,7 @@
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+pydantic==2.5.0
+python-multipart==0.0.6
+ruff==0.1.6

ruff.toml

@@ -0,0 +1,9 @@
+[lint]
+select = ["E", "F", "W", "I"]
+ignore = []
+
+[format]
+quote-style = "double"
+indent-style = "space"
+skip-magic-trailing-comma = false
+line-ending = "auto"