Implement complete Task Manager API with FastAPI

- Set up FastAPI application with CORS support
- Created SQLAlchemy models for task management
- Implemented CRUD operations for tasks
- Added database migrations with Alembic
- Created REST API endpoints for task operations
- Added health check endpoint
- Updated README with comprehensive documentation
- Applied code formatting with Ruff

README.md

@@ -1,3 +1,72 @@
-# 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 status tracking (completed/pending)
+- Task priority levels (high, medium, low)
+- Automatic timestamps (created_at, updated_at)
+- 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
+
+### Root
+- `GET /` - Get API information and links
+
+### Health Check
+- `GET /health` - Check API health status
+
+### Tasks
+- `GET /tasks/` - List all tasks
+- `POST /tasks/` - Create a new task
+- `GET /tasks/{task_id}` - Get a specific task
+- `PUT /tasks/{task_id}` - Update a task
+- `DELETE /tasks/{task_id}` - Delete a task
+
+## Documentation
+
+- Interactive API documentation: `http://localhost:8000/docs`
+- Alternative documentation: `http://localhost:8000/redoc`
+- OpenAPI schema: `http://localhost:8000/openapi.json`
+
+## Task Schema
+
+```json
+{
+  "title": "string",
+  "description": "string (optional)",
+  "completed": "boolean (default: false)",
+  "priority": "string (default: 'medium')"
+}
+```
+
+## Development
+
+This project uses:
+- **FastAPI** - Web framework
+- **SQLAlchemy** - ORM
+- **Alembic** - Database migrations
+- **SQLite** - Database
+- **Ruff** - Code formatting and linting

alembic.ini

@@ -0,0 +1,98 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# 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 path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses
+# os.pathsep. If this key is omitted entirely, it falls back to the legacy
+# behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[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 +1,81 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+# Add the project root to the Python path
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.db.base import Base
+
+# 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:
+        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_initial_migration.py

@@ -0,0 +1,40 @@
+"""Initial migration
+
+Revision ID: 001
+Revises: 
+Create Date: 2025-06-19 10:00:00.000000
+
+"""
+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:
+    # ### commands auto generated by Alembic - please adjust! ###
+    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), 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)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    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')
+    # ### end Alembic commands ###

app/crud/base.py

@@ -0,0 +1,55 @@
+from typing import Any, Dict, Generic, List, Optional, Type, TypeVar, Union
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+from app.db.base import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    def __init__(self, model: Type[ModelType]):
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        return db.query(self.model).filter(self.model.id == id).first()
+
+    def get_multi(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[ModelType]:
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        obj_in_data = obj_in.dict()
+        db_obj = self.model(**obj_in_data)
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self,
+        db: Session,
+        *,
+        db_obj: ModelType,
+        obj_in: Union[UpdateSchemaType, Dict[str, Any]]
+    ) -> ModelType:
+        obj_data = db_obj.__dict__
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.dict(exclude_unset=True)
+        for field in obj_data:
+            if field in update_data:
+                setattr(db_obj, field, update_data[field])
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def remove(self, db: Session, *, id: int) -> ModelType:
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj

app/crud/task.py

@@ -0,0 +1,8 @@
+from app.crud.base import CRUDBase
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+class CRUDTask(CRUDBase[Task, TaskCreate, TaskUpdate]):
+    pass
+
+task_crud = CRUDTask(Task)

app/db/base.py

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

app/db/session.py

@@ -0,0 +1,23 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+
+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()

app/models/task.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Text
+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), onupdate=func.now())

app/schemas/task.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+
+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 TaskResponse(TaskBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True

main.py

@@ -0,0 +1,72 @@
+from fastapi import FastAPI, HTTPException, Depends, status
+from fastapi.middleware.cors import CORSMiddleware
+from sqlalchemy.orm import Session
+from typing import List
+import uvicorn
+
+from app.db.session import get_db
+from app.schemas.task import TaskCreate, TaskUpdate, TaskResponse
+from app.crud.task import task_crud
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A simple task management API built with FastAPI",
+    version="1.0.0",
+    openapi_url="/openapi.json"
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+@app.get("/")
+async def root():
+    return {
+        "title": "Task Manager API",
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+@app.get("/health")
+async def health_check():
+    return {
+        "status": "healthy",
+        "message": "Task Manager API is running"
+    }
+
+@app.post("/tasks/", response_model=TaskResponse, status_code=status.HTTP_201_CREATED)
+async def create_task(task: TaskCreate, db: Session = Depends(get_db)):
+    return task_crud.create(db=db, obj_in=task)
+
+@app.get("/tasks/", response_model=List[TaskResponse])
+async def get_tasks(db: Session = Depends(get_db)):
+    return task_crud.get_multi(db=db)
+
+@app.get("/tasks/{task_id}", response_model=TaskResponse)
+async def get_task(task_id: int, db: Session = Depends(get_db)):
+    task = task_crud.get(db=db, id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return task
+
+@app.put("/tasks/{task_id}", response_model=TaskResponse)
+async def update_task(task_id: int, task_update: TaskUpdate, db: Session = Depends(get_db)):
+    task = task_crud.get(db=db, id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return task_crud.update(db=db, db_obj=task, obj_in=task_update)
+
+@app.delete("/tasks/{task_id}")
+async def delete_task(task_id: int, db: Session = Depends(get_db)):
+    task = task_crud.get(db=db, id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    task_crud.remove(db=db, id=task_id)
+    return {"message": "Task deleted successfully"}
+
+if __name__ == "__main__":
+    uvicorn.run(app, host="0.0.0.0", port=8000)

requirements.txt

@@ -0,0 +1,6 @@
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+python-multipart==0.0.6
+ruff==0.1.6