Question

如何在继续发布路线之前检查是否存在mongo / mongoose值？

我的（部分）Mongoose模型如下所示：

 reserved: {type: Boolean, default: false}
 module.exports = mongoose.model("Rentals", rentalsSchema);

我一直试图以这种方式检查保留是否属实，没有任何运气

注意：正如您在下面看到的那样，这需要适用于每个租赁ID，因此需要以某种方式查找BYId。

router.put("/:id/reserve", middleware.checkRentalsStatus, function(req, res){


     //checking here for existing value
     //checking here for existing value

     if(Rentals.reserved == true){
            res.redirect("back");
            console.log('TAKEN!')
        } else {


 // Token is created using Stripe.js or Checkout!
// Get the payment token submitted by the form:
 var token = req.body.stripeToken; // Using Express

// Charge the user's card:
  var charge = stripe.charges.create({
  amount: 19500,
  currency: "usd",
  description: "",
  source: token,
}, function(err, charge) {
     if(err){
            req.flash("error", err.message);
            res.redirect("back");
        } else {


    var reservedby = req.body.reservedby;
    var reserved = true;
    var reservedemail = req.body.reservedemail;
    var newReservation = {reserved: reserved, reservedby: reservedby, reservedemail: reservedemail }
    Rentals.findByIdAndUpdate(req.params.id, {$set: newReservation}, function(err, rentals){
        if(err){
            req.flash("error", err.message);
            res.redirect("back");
        } else {

            req.flash("success","It's reserved for you. Thank you!");
            res.redirect("/rentals/" + rentals._id);
        }
    });

}
});

  console.log('charged')
});

如何在完成邮政路线之前更改我的代码以检查保留是否为真？（我试图检查后端的预留路线是否有租金。）

Answer 1

你可以直接检查if / else是否像这样

  if(Rentals.reserved )
     { res.redirect("back"); console.log('TAKEN!') } 
        else { // continue with post route 
       }

Answer 2

这就是答案。最好的方法是创建一个中间件来检查。其他答案的问题是他们没有找到肾脏的ID。 Rentals.findByID是实现这项工作的关键。：）

//CHECK Rentals HAS NOT BEEN RENTED
middlewareObj.checkRentalsStatus = function(req, res, next){
    Rentals.findById(req.params.id, function(err, foundRentals){
    if (err){
        res.redirect("back");
    }

  if (foundRentals.reserved){
            req.flash("error", 'Oh no! It looks like someone else JUST rented this location. Your credit card was not charged.');
            res.redirect("back");
} else {
next();
}
});
}

MongoDB检查现有值

2 个答案: