Blueprints

Blueprints allow for modular code, they should be used whenever the routes start to span multiple modules. Blueprints, like the app can have template and static files, therefore a typical folder structure for a blueprint termed store would be,

blueprints/
blueprints/store/__init__.py
blueprints/store/templates/
blueprints/store/templates/index.html
blueprints/store/static/

the __init__.py file should contain something like,

from quart import Blueprint

blueprint = Blueprint('store', __name__)

@blueprint.route('/')
async def index():
    return await render_template('index.html')

the endpoint is then identified as store.index for example when using url_for('store.index').

Nested Blueprints

It is possible to register a blueprint on another blueprint.

parent = Blueprint("parent", __name__, url_prefix="/parent")
child = Blueprint("child", __name__, url_prefix="/child")
parent.register_blueprint(child)
app.register_blueprint(parent)

The child blueprint will gain the parent’s name as a prefix to its name, and child URLs will be prefixed with the parent’s URL prefix.

url_for('parent.child.create')
/parent/child/create

Blueprint-specific before request functions, etc. registered with the parent will trigger for the child. If a child does not have an error handler that can handle a given exception, the parent’s will be tried.