Flask（Part.26）｜ 【注文管理アプリケーションのプログラミング（２）l（１）の解説】

import os

from flask import Blueprint, redirect, render_template, url_for

from apps.common.db import db
from apps.ordersapp.forms import OrderForm
from apps.ordersapp.models import Order
from apps.productsapp.models import Category, Product
from apps.tablesapp.models import Table

orders_bp = Blueprint(
    "orders",
    __name__,
    template_folder=os.path.join(os.getcwd(), "apps", "ordersapp", "templates"),
    static_folder=os.path.join(os.getcwd(), "apps", "ordersapp", "static"),
)


def create_orders_app(app):
    """Blueprintを新規作成し、登録する関数"""
    return orders_bp


@orders_bp.route("/order/table/<int:table_id>", methods=["GET"])
def order_menu(table_id):
    table = Table.query.get_or_404(table_id)
    categories = Category.query.all()
    products = Product.query.all()
    orders = Order.query.filter_by(table_id=table.id).all()

    total_amount = sum(order.total for order in orders)

    return render_template(
        "order_menu.html",
        products=products,
        orders=orders,
        table=table,
        categories=categories,
        total_amount=total_amount,
        title="メニュー一覧",
    )


@orders_bp.route(
    "/order/table/<int:table_id>/product/<int:product_id>", methods=["GET", "POST"]
)
def order_form(table_id, product_id):
    table = Table.query.get_or_404(table_id)
    product = Product.query.get_or_404(product_id)
    form = OrderForm()

    if form.validate_on_submit():
        quantity = form.quantity.data
        total = product.price * quantity

        order = Order(
            table_id=table.id,
            product_id=product.id,
            quantity=quantity,
            total=total,
            product_name=product.name,
        )
        db.session.add(order)
        db.session.commit()
        return redirect(url_for("orders.order_menu", table_id=table.id))

    return render_template(
        "order_form.html",
        form=form,
        product=product,
        table=table,
        title="注文フォーム",
    )