填充对象嵌套嵌套的猫鼬

Question

I have been trying to populate products in my Cart. My Cart model is -

const ProductSchema = new mongoose.Schema({
  product: { type: mongoose.Schema.Types.ObjectId, ref: 'Product'},
  quantity: Number
});
const CartSchema = new mongoose.Schema({
  userId: mongoose.Schema.Types.ObjectId,
  products: [ProductSchema]
});

I am trying to get the cart value like this -

let getCart = async (userId) => {
  let res = await Cart.find({ userId: userId }).populate('products.product')
  return res;
};

Output -

{
  userId: xyz,
  products:[
    product: null,
    quantity:1
  ]
}

Expected Result -

{ 
  userId: xyz,
  products:[
    product: {
      name: 'product name', 
      description:'',
      ...
    },
    quantity:1
  ]
}

Answer 1

您只需要填充products然后从填充的阵列中选择要显示的product即可。

Answer 2

Just populating product is enough I guess.

let getCart = async (userId) => {
  let res = await Cart.find({ userId: userId }).populate('products')
  return res;
};