Implement Task Manager API

- Set up project structure with FastAPI
- Configure SQLite database with SQLAlchemy
- Create Task model with Alembic migrations
- Implement CRUD API endpoints for tasks
- Add health check and CORS configuration
- Update documentation

README.md

@@ -1,3 +1,79 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+This is a FastAPI-based Task Manager API with SQLite backend. It provides endpoints for managing tasks with features like priority, due dates, and filtering.
+
+## Features
+
+- Create, read, update, and delete tasks
+- Mark tasks as completed
+- Filter tasks by completion status and priority
+- SQLite database with SQLAlchemy ORM
+- Alembic for database migrations
+- FastAPI automatic API documentation
+
+## API Endpoints
+
+- `GET /health`: Health check endpoint
+- `GET /api/v1/tasks`: List all tasks (with optional filtering)
+- `POST /api/v1/tasks`: Create a new task
+- `GET /api/v1/tasks/{task_id}`: Get a specific task
+- `PUT /api/v1/tasks/{task_id}`: Update a task
+- `DELETE /api/v1/tasks/{task_id}`: Delete a task
+- `PATCH /api/v1/tasks/{task_id}/complete`: Mark a task as completed
+
+## Project Structure
+
+```
+taskmanagerapi/
+├── alembic.ini              # Alembic configuration
+├── main.py                  # FastAPI application entry point
+├── requirements.txt         # Python dependencies
+├── app/                     # Application code
+│   ├── api/                 # API routes
+│   │   └── v1/              # API version 1
+│   │       ├── endpoints/   # API endpoint handlers
+│   │       └── router.py    # API router
+│   ├── core/                # Core application code
+│   │   └── config.py        # Application configuration
+│   ├── db/                  # Database related code
+│   │   └── session.py       # Database session setup
+│   ├── models/              # SQLAlchemy models
+│   │   └── task.py          # Task model
+│   └── schemas/             # Pydantic schemas
+│       └── task.py          # Task schemas
+└── migrations/              # Database migrations
+    ├── env.py               # Alembic environment
+    ├── script.py.mako       # Migration script template
+    └── versions/            # Migration versions
+        └── 01_initial_migration.py  # Initial migration
+```
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8+
+- pip (Python package installer)
+
+### Installation
+
+1. Clone the repository
+2. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+3. Apply migrations:
+   ```
+   alembic upgrade head
+   ```
+4. Start the server:
+   ```
+   uvicorn main:app --reload
+   ```
+
+### API Documentation
+
+Once the server is running, you can access:
+- Swagger UI documentation: http://localhost:8000/docs
+- ReDoc documentation: http://localhost:8000/redoc
+- OpenAPI JSON: http://localhost:8000/openapi.json

alembic.ini

@@ -0,0 +1,74 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL - using absolute path
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = INFO
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stdout,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

app/api/v1/endpoints/tasks.py

@@ -0,0 +1,105 @@
+from typing import List, Optional
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.models.task import Task as TaskModel
+from app.schemas.task import Task, TaskCreate, TaskUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Task])
+def read_tasks(
+    skip: int = 0,
+    limit: int = 100,
+    completed: Optional[bool] = None,
+    priority: Optional[int] = None,
+    db: Session = Depends(get_db),
+):
+    """
+    Retrieve tasks with optional filtering.
+    """
+    query = db.query(TaskModel)
+    
+    # Apply filters if provided
+    if completed is not None:
+        query = query.filter(TaskModel.is_completed == completed)
+    
+    if priority is not None:
+        query = query.filter(TaskModel.priority == priority)
+    
+    # Apply pagination
+    tasks = query.order_by(TaskModel.created_at.desc()).offset(skip).limit(limit).all()
+    return tasks
+
+
+@router.post("/", response_model=Task, status_code=status.HTTP_201_CREATED)
+def create_task(task: TaskCreate, db: Session = Depends(get_db)):
+    """
+    Create a new task.
+    """
+    db_task = TaskModel(**task.model_dump())
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+@router.get("/{task_id}", response_model=Task)
+def read_task(task_id: int, db: Session = Depends(get_db)):
+    """
+    Get a specific task by ID.
+    """
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+
+@router.put("/{task_id}", response_model=Task)
+def update_task(task_id: int, task: TaskUpdate, db: Session = Depends(get_db)):
+    """
+    Update a task.
+    """
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    
+    # Update only the fields that are set
+    update_data = task.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(db_task, key, value)
+    
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+@router.delete("/{task_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_task(task_id: int, db: Session = Depends(get_db)):
+    """
+    Delete a task.
+    """
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    
+    db.delete(db_task)
+    db.commit()
+    return None
+
+
+@router.patch("/{task_id}/complete", response_model=Task)
+def complete_task(task_id: int, db: Session = Depends(get_db)):
+    """
+    Mark a task as completed.
+    """
+    db_task = db.query(TaskModel).filter(TaskModel.id == task_id).first()
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    
+    db_task.is_completed = True
+    db.commit()
+    db.refresh(db_task)
+    return db_task

app/api/v1/router.py

@@ -0,0 +1,6 @@
+from fastapi import APIRouter
+from app.api.v1.endpoints import tasks
+
+router = APIRouter()
+
+router.include_router(tasks.router, prefix="/tasks", tags=["Tasks"])

app/core/config.py

@@ -0,0 +1,19 @@
+from pydantic_settings import BaseSettings
+from pathlib import Path
+
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "Task Manager API"
+    PROJECT_DESCRIPTION: str = "A FastAPI Task Manager API with SQLite backend"
+    VERSION: str = "0.1.0"
+    
+    # Database settings
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+    
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+
+
+settings = Settings()

app/db/session.py

@@ -0,0 +1,27 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from app.core.config import settings
+
+# Ensure the DB directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+# Create SQLAlchemy engine
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}  # Only needed for SQLite
+)
+
+# Create SessionLocal class
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Create Base class for models
+Base = declarative_base()
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,3 @@
+from app.models.task import Task
+
+__all__ = ["Task"]

app/models/task.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, func
+from app.db.session 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)
+    is_completed = Column(Boolean, default=False)
+    priority = Column(Integer, default=1)  # 1=Low, 2=Medium, 3=High
+    due_date = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=func.now(), nullable=False)
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now(), nullable=False)

app/schemas/__init__.py

@@ -0,0 +1,3 @@
+from app.schemas.task import Task, TaskCreate, TaskUpdate
+
+__all__ = ["Task", "TaskCreate", "TaskUpdate"]

app/schemas/task.py

@@ -0,0 +1,37 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    is_completed: bool = False
+    priority: int = Field(1, ge=1, le=3, description="Task priority: 1=Low, 2=Medium, 3=High")
+    due_date: Optional[datetime] = None
+
+
+class TaskCreate(TaskBase):
+    pass
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    is_completed: Optional[bool] = None
+    priority: Optional[int] = Field(None, ge=1, le=3, description="Task priority: 1=Low, 2=Medium, 3=High")
+    due_date: Optional[datetime] = None
+
+
+class TaskInDBBase(TaskBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Task(TaskInDBBase):
+    pass

main.py

@@ -0,0 +1,34 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api.v1.router import router as api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description=settings.PROJECT_DESCRIPTION,
+    version=settings.VERSION,
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set up CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix="/api/v1")
+
+# Health check endpoint
+@app.get("/health", tags=["Health"])
+async def health_check():
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/env.py

@@ -0,0 +1,83 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import Base and all models
+from app.db.session import Base
+import app.models  # noqa
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    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:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,  # Enable batch mode for SQLite
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/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"}

migrations/versions/01_initial_migration.py

@@ -0,0 +1,43 @@
+"""Initial migration
+
+Revision ID: 01_initial_migration
+Revises: 
+Create Date: 2023-07-09
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '01_initial_migration'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create tasks table
+    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('is_completed', sa.Boolean(), nullable=False, default=False),
+        sa.Column('priority', sa.Integer(), nullable=False, default=1),
+        sa.Column('due_date', sa.DateTime(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=False, server_default=sa.func.now()),
+        sa.Column('updated_at', sa.DateTime(), nullable=False, server_default=sa.func.now()),
+        sa.PrimaryKeyConstraint('id')
+    )
+    
+    # Create index on title
+    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:
+    # Drop tasks table
+    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')

requirements.txt

@@ -0,0 +1,8 @@
+fastapi>=0.100.0
+uvicorn>=0.22.0
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+sqlalchemy>=2.0.0
+alembic>=1.11.0
+python-dotenv>=1.0.0
+ruff>=0.0.270