ObjectParameterError when saving to database with mongoose

Question

I'm making a small blog until now everything works great but now that I try to add a second Schema for categories I got this error ObjectParameterError: Parameter "obj" to Document() must be an object, got . This is the part of the code that is been interested:

const blog_create_post = (req, res) => {
    const blog = new Blog(req.body);
    const category = new Category(req.body.category)
    ...
}

The first declaration work, but the second one send me the error Full error:

ObjectParameterError: Parameter "obj" to Document() must be an object, got <text>

This is req.body:

body: {
    category: 'wdawda',
    title: 'awdawd',
    snippet: 'dawdaw',
    body: 'dawdawda'
  }

Mongoose Schema:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const categorySchema = new Schema({
    category: {
        type: String,
        required: true
    }
});

const Category = mongoose.model('Category', categorySchema);
module.exports = Category;

I tried this:

var things = req.body.category
const category = new Category(things);

and I don't have any error until the next line. This is the whole function:

const blog_create_post = (req, res) => {
    const blog = new Blog(req.body);
    var things = { category: req.body.category };
    const category = new Category(things);
    if (!Category.exists({ category: things })) {
        console.log('category not exist');
        category.save()
        .then((result) => {
            blog.save()
            .then((result) => {
                res.redirect('/blogs');
            })
            .catch((err) => console.log(err));
        })
        .catch((err) => res.send(err));
    } else {
        console.log('category exist');
        blog.save()
            .then((result) => {
                res.redirect('/blogs');
            })
            .catch((err) => console.log(err));
    }
}

the new error is this:

UnhandledPromiseRejectionWarning: CastError: Cast to string failed for value "{ category: 'awdawd' }" at path "category" for model "Category"

I'v got another error: SyntaxError: Unexpected token s in JSON at position 0 at JSON.parse (<anonymous>) — Metiu19
– Metiu19, Commented Aug 9, 2020 at 10:00
same error as before, the only things that change is the position number: SyntaxError: Unexpected token o in JSON at position 1 at JSON.parse (<anonymous>) — Metiu19
– Metiu19, Commented Aug 9, 2020 at 10:16
This is req.body: { category: 'dawda', title: 'dawda', snippet: 'awdawd', body: 'awdawdawd' } — Metiu19
– Metiu19, Commented Aug 9, 2020 at 10:36

Renato Alencar · Accepted Answer · 2020-08-09 12:44:19Z

1

You can try this:

const category = new Category({ category: req.body.category })

This line in the blog_create_post function:

const blog_create_post = (req, res) => {
    const blog = new Blog(req.body);
    const category = new Category({ category: req.body.category });
    ...
}

I pass a object with "category" attribute instead of "category" value directly.

answered Aug 9, 2020 at 12:44

Renato Alencar

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