Why did the Mongoose fail to cast to ObjectID for this value?

I'm facing an issue where I know what the problem is, but can't wrap my head around why it's happening. In my simple recipe app that utilizes express and mongoose, users input recipe information through a form which is then saved to the database using mongoose methods. Everything seems to work smoothly as when I log test data, I can see that the following data is successfully saved:

{
  ingredients: [ 'peanut butter', 'jelly', 'bread' ],
  _id: 5e47d564f775ce247052d01c,
  name: 'pb jelly sammich',
  author: 'rob',
  oneLiner: 'classic pb jelly sammich',
  image: 'picofpbsammich here',
  method: 'add all the ingredients together and boom! pb jelly sammich.',
  __v: 0
}

(This is also visible when checking mongo db with db.recipes.find() and when passing the object to the ejs show template.

However, upon accessing my show route via a get request, I encounter a lengthy error message using the aforementioned test data. The crucial portion of the error message reads:

'Cast to ObjectId failed for value "picofpbsammich here" at path "_id" for model "Recipes"',

While I comprehend the issue at hand, I am perplexed by its occurrence. Here is my show route:

app.get("/recipes/:id", function (req, res) {
    console.log(req.params.id)
    Recipe.findById(req.params.id, function (err, foundRecipe) {
        if (err) {
            console.log(err);
        } else {
            res.render("show", { recipe: foundRecipe });
        }
    })
})

Logging req.params.id as shown above produces:

5e47d564f775ce247052d01c
picofpbsammich here

The first line contains the correct ID while the second line clearly does not and causes the problem. However, I am unable to pinpoint where this incorrect value is originating from. Why would req.params.id retrieve the VALUE of a property with a completely different name?

Since I am new to mongoose, I suspect it may be a minor mistake on my part. Any explanations would be greatly appreciated.

Here is the model being used:

var mongoose = require("mongoose");

let recipeSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    author: String,
    oneLiner: String,
    ingredients: [String],
    image: String,
    method: String
})
module.exports = mongoose.model("Recipes", recipeSchema)

Answer №1

The code you posted looks like this:

app.get("/recipes/:id", function (req, res) {
    console.log(req.params.id)
    Recipe.findById(req.params.id, function (err, foundRecipe) {
        if (err) {
            console.log(err);
        } else {
            res.render("show", { recipe: foundRecipe });
        }
    })
})

You mentioned that in the console.log you received:

5e47d564f775ce247052d01c
picofpbsammich here

This was followed by an exception being logged:

'Cast to ObjectId failed for value "picofpbsammich here" at path "_id" for model "Recipes"',

From this information, it seems like you are sending two requests, one of which has an invalid id, specifically:

picofpbsammich here

Mongoose is unable to convert this value to an ObjectId, leading to the exception being thrown, which is a logical outcome.

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