【发布时间】：2020-02-26 00:08:54
【问题描述】：
我正在编写一个简单的应用程序，用于使用 Flask-SQLAlchemy 向 sqlite3 数据库添加和更新信息。现在我有一个大问题，因为我无法更新数据库，它只是每次提交表单按钮时都会添加一条新记录。
这是我的代码：
@main.route("/invoices", methods=["GET", "POST"], defaults={"invoice_id": None})
@main.route("/invoices/<int:invoice_id>", methods=["GET", "POST"])
def invoices(invoice_id):
invoice = None
if invoice_id:
invoice = Invoice.query.get_or_404(invoice_id)
if request.method == "POST":
date = request.form["date"]
name = request.form["name"]
value = request.form["value"]
currency = request.form["currency"]
payment = request.form["payment"]
category = request.form["category"]
description = request.form["description"]
if invoice:
invoice.date = datetime.strptime(date, "%Y-%m-%d")
invoice.name = name
invoice.value = value
invoice.currency = currency
invoice.payment = payment
invoice.category = category
invoice.description = description
else:
invoice = Invoice(
date=datetime.strptime(date, "%Y-%m-%d"),
name=name,
value=value,
currency=currency,
payment=payment,
category=category,
description=description,
)
db.session.add(invoice)
db.session.commit()
return redirect(url_for("main.invoices", invoice_id=invoice.id))
currencies = Currency.query.all()
payments = Payment.query.all()
categories = Category.query.all()
context = {
"invoice_id": invoice_id,
"currencies": currencies,
"payments": payments,
"categories": categories,
"invoice": invoice,
}
return render_template("invoices.html", **context)
我不知道如何更新数据，因为它总是添加一条新记录，现在只提交现有或更改的字段。也许我的 if 语句有问题...
请帮我完成这项任务...
这是模型：
class Invoice(db.Model):
id = db.Column(db.Integer, primary_key=True)
value = db.Column(db.Integer)
date = db.Column(db.DateTime)
name = db.Column(db.String(50))
description = db.Column(db.String(100))
currency = db.Column(db.ForeignKey("currency.id"))
payment = db.Column(db.ForeignKey("payment.id"))
category = db.Column(db.ForeignKey("category.id"))
class Currency(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(10))
class Payment(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(50))
class Category(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(50))
【问题讨论】：
-
你也可以分享你的模型类吗？
-
@tedivm：我添加了上面的模型。
标签： python flask sqlalchemy flask-sqlalchemy