尝试使用 Z758D31F351CE14BF27C522FZ 在 node.js 中从 POST API 中的 mongodb 集合中发布数组

Question

This is my orders model .

const Order = mongoose.model('Order', new mongoose.Schema({
    saleprice: {type: Number},
    discount: {type: Number},
    products : [{
        type: productSchema
    }]
}));

This is my products model

const productSchema = new mongoose.Schema({
    name: {type: String, required: true},
    price: {type: Number, required: true},
    category: {type: String, required: true}
});

Now I want to post multiple products in single order post API call ; Currently using this approach but this is not working for arrays. How I can add multiple products just by sending multiple productIds in JSON format.

router.post('/', async(req, res) =>{

    const product = await Product.findById(req.body.productId);
    if(!product) 
        return res.status(400).send('Invalid product.');

    const order =new Order({        
        saleprice: "790",
        discount: "100",
        products: [{
            _id: product._id,
            name: product.name,
            price: (product.price).toString(),
            category: product.category
        }]
    });
    await order.save();
    res.send(order);

});

Answer 1

You have to think of it in modular terms and approach it step by step.

You are currently trying to do it all at once. Break it into bits.

Here is an example:

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

const personSchema = Schema({
  _id: Schema.Types.ObjectId,
  name: String,
  age: Number,
  stories: [{ type: Schema.Types.ObjectId, ref: 'Story' }]
});

const Person = mongoose.model('Person', personSchema);

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

const storySchema = Schema({
  author: { type: Schema.Types.ObjectId, ref: 'Person' },
  title: String,
  fans: [{ type: Schema.Types.ObjectId, ref: 'Person' }]
});

const Story = mongoose.model('Story', storySchema);

From the example you can see that you are not doing the right way as you have not set a reference between Order and Product.

You order schema can set a reference to product like so:

...
products : [{
        type: Schema.Types.ObjectId, ref: 'Product'
    }]
...

The code above defines an association between the and database schemas. Like I mentioned in the beginning, you have to take a modular approach. From what I can see about your Project, you create Products first and then a customer creates an Order per Product. You have to the create a Products. When this is done, you can then reference a particular product by Id when you are creating an order. Like so:

...
const order =new Order({        
        saleprice: "790",
        discount: "100",
        products: req.body.productId
    });
...

You can read more on Mongoose Populate method here.