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我正在尝试从产品表中删除产品，同时还从产品移动表中删除该产品的所有移动（称为移动），但只有产品被删除，而不是它的移动。有谁知道为什么？这是代码：

@app.route('/products/<int:product_id>/delete', methods=['GET', 'POST'])   
def delete_product(product_id):
    product = Product.query.get_or_404(product_id)
    movements = Movement.query.filter_by(product_id=product_id).all()
    for movement in movements:
        db.session.delete(movement)
    db.session.delete(product)
    db.session.commit()
    flash('The product has been deleted!', 'success')
    return redirect(url_for('products'))

这是产品表的模型：

class Product(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50), unique=True, nullable=False)
    product_movements = db.relationship('Movement', backref='item', lazy=True)

这是运动表的一个：

class Movement(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    product_id = db.Column(db.Integer, db.ForeignKey('product.id'))
    product = db.Column(db.String(50), nullable=False)
    from_location_id = db.Column(db.Integer, db.ForeignKey('location.id'))
    from_location = db.Column(db.String(50))
    to_location_id = db.Column(db.Integer, db.ForeignKey('location.id'))
    to_location = db.Column(db.String(50))
    quantity = db.Column(db.Integer, nullable=False)
    timestamp = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
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1 回答 1

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我发现出了什么问题，我没有在 Movement 表中设置 product_id 的值。

    if form.validate_on_submit():
        product = Product.query.filter_by(id=form.product.data).first()
        from_location = Location.query.filter_by(id=form.from_location.data).first()
        to_location = Location.query.filter_by(id=form.to_location.data).first()
        m = Movement(product_id = product.id, product = product.name, from_location_id = from_location.id, from_location = from_location.name, to_location_id = to_location.id, to_location = to_location.name, quantity = form.quantity.data)
        db.session.add(m)
        db.session.commit()
        movements = Movement.query.all()
        products = Product.query.all()
        locations = Location.query.all()
        return render_template('movements.html', movements=movements, products=products, locations=locations, form=form)

现在可以了。

于 2020-09-19T12:03:57.680 回答