Hey internet programmers, recently I was trying FastAPI (FastAPI is a Web framework for developing RESTful APIs in Python) for my next project and it is really amazing. So let me share a small tutorial on making a ToDo app using FastAPI and with the Jinja2 template.
Create Virtual Environment
First, create a directory name it todoapp and open terminal, and cd into todoapp then you need to type the following command.
virtualenv envAssuming virtualenv is already installed on your PC. If not please visit this -> https://virtualenv.pypa.io/en/latest/installation.html
Now activate the virtual environment
source env/bin/activateInstallation
Install FastAPI. make sure your environment is activated
pip install fastapiAlso, install uvicorn to work as the server
pip install "uvicorn[standard]"Install package for templating
pip install jinja2 python-multipartInstall package for database support
pip install sqlalchemyNow make main.py, database.py, and model.py in the same directory (in todoapp directory) and also make the templates and static directory, and its look like this,
do not worry about __pycache__
main.py
# main.py
from fastapi import FastAPI, Request, Depends, Form, status
from fastapi.templating import Jinja2Templates
import models
from database import engine, sessionlocal
from sqlalchemy.orm import Session
from fastapi.responses import RedirectResponse
from fastapi.staticfiles import StaticFiles
models.Base.metadata.create_all(bind=engine)
templates = Jinja2Templates(directory="templates")
app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="static")
def get_db():
db = sessionlocal()
try:
yield db
finally:
db.close()
@app.get("/")
async def home(request: Request, db: Session = Depends(get_db)):
todos = db.query(models.Todo).order_by(models.Todo.id.desc())
return templates.TemplateResponse("index.html", {"request": request, "todos": todos})
@app.post("/add")
async def add(request: Request, task: str = Form(...), db: Session = Depends(get_db)):
todo = models.Todo(task=task)
db.add(todo)
db.commit()
return RedirectResponse(url=app.url_path_for("home"), status_code=status.HTTP_303_SEE_OTHER)
@app.get("/edit/{todo_id}")
async def add(request: Request, todo_id: int, db: Session = Depends(get_db)):
todo = db.query(models.Todo).filter(models.Todo.id == todo_id).first()
return templates.TemplateResponse("edit.html", {"request": request, "todo": todo})
@app.post("/edit/{todo_id}")
async def add(request: Request, todo_id: int, task: str = Form(...), completed: bool = Form(False), db: Session = Depends(get_db)):
todo = db.query(models.Todo).filter(models.Todo.id == todo_id).first()
todo.task = task
todo.completed = completed
db.commit()
return RedirectResponse(url=app.url_path_for("home"), status_code=status.HTTP_303_SEE_OTHER)
@app.get("/delete/{todo_id}")
async def add(request: Request, todo_id: int, db: Session = Depends(get_db)):
todo = db.query(models.Todo).filter(models.Todo.id == todo_id).first()
db.delete(todo)
db.commit()
return RedirectResponse(url=app.url_path_for("home"), status_code=status.HTTP_303_SEE_OTHER)
database.py
# database.py
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
DB_URL = 'sqlite:///todo.sqlite3'
engine = create_engine(DB_URL, connect_args={'check_same_thread': False})
sessionlocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
models.py
# models.py
from sqlalchemy import Column, Integer, Boolean, Text
from database import Base
class Todo(Base):
__tablename__ = 'todos'
id = Column(Integer, primary_key=True)
task = Column(Text)
completed = Column(Boolean, default=False)
def __repr__(self):
return '<Todo %r>' % (self.id)
Now let’s make templates inside the templates directory
templates/base.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ToDo App</title>
<link rel="stylesheet" href="{{ url_for('static', path='css/main.css') }}">
</head>
<body>
<main>
<h1>ToDo App</h1>
<br>
{% block content %}
{% endblock content %}
</main>
</body>
</html>
templates/index.html
{% extends 'base.html' %}
{% block content %}
<form action="/add" method="post">
<textarea name="task" rows="5" placeholder="Enter your task"></textarea>
<button type="submit">Add</button>
</form>
<br>
<h2>Tasks</h2>
<div>
{% for todo in todos %}
<div class="task">
{% if todo.completed %}
<strike>{{ todo.task }}</strike>
{% else %}
{{ todo.task }}
{% endif %}
<small>
<a href="edit/{{ todo.id }}">Edit</a>
<a href="delete/{{ todo.id }}">Delete</a>
</small>
</div>
{% endfor %}
</div>
{% endblock content %}
templates/edit.html
{% extends 'base.html' %}
{% block content %}
<form action="/edit/{{todo.id}}" method="post">
<textarea name="task" rows="5">{{todo.task}}</textarea>
<label for="completed">Done?</label>
<input type="checkbox" name="completed" {% if todo.completed %}checked{% endif %}>
<button type="submit">Save</button>
</form>
{% endblock content %}
static/css/main.css
let’s add some styling
*{
padding: 0;
margin: 0;
box-sizing: border-box;
}
body{
font-family: 'Roboto', sans-serif;
background: #f5f5f5;
}
main{
width: 100%;
max-width: 520px;
margin: 0 auto;
padding: 0 20px;
}
textarea{
width: 100%;
height: 100px;
border: 1px solid #ccc;
border-radius: 5px;
padding: 10px;
resize: none;
}
button{
width: 100%;
height: 40px;
border: 1px solid #ccc;
border-radius: 5px;
background-color: #eee;
color: #333;
font-size: 16px;
cursor: pointer;
}
.task{
display: flex;
align-items: center;
justify-content: space-between;
padding: 8px 0;
border-bottom: 1px solid #ccc;
}
.task:first-child{
border-top: 1px solid #ccc;
}
Output
To run the FastAPI app type the following command and hit enter
uvicorn main:app --reloadwith uvicorn using the file_name:app_instance
open the link on the browser (http://127.0.0.1:8000)
Source code on GitHub: https://github.com/SoniArpit/simple-todoapp-fastapi
Happy Coding 🙂
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