Question 115213 in Mongodb Question posted in
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Mongodb – Mongoose models typing fails

i’m working with products and categories
i need that product model’s categories type to be an array of Category

i’ve created these two types

type Category = {
    parent: Category | null;  // is this ok?
    name: String;
};
type Product = {
    categories: Category[];
    name: String;
    qty: Number;
    price: Number;
};

then i’ve created the models

// category model
import { Schema, Types, model } from "mongoose";
import Category from "../types/Category";

const categorySchema = new Schema(
    {
        parent: { type: Category | null, required: true },      // NEED HELP WITH THIS TYPE
        name: { type: String, required: true },
    },
    { timestamps: true }
);

export default model("Category", categorySchema);

// product model
import { Schema, Types, model } from "mongoose";
import Category from "../types/Category";

const productSchema = new Schema(
    {
        categories: { type: [Category], required: true },     // NEED HELP WITH THIS TYPE
        name: { type: String, required: true }
        qty: { type: Number, required: true }
        price: { type: Number, required: true }
    },
    { timestamps: true }
);

export default model("Product", productSchema);

vs code shows no error but when i run the server that’s the error i get:

isn’t productSchema’s categories type an array of Category?

i’ve also tried categories: { type: Types.Array<Category>, required: true } with no success

if i pass the categorySchema like this

// product model
import { Schema, Types, model } from "mongoose";
import categorySchema from "./category.model";

const productSchema = new Schema(     // should i pass something here? like Schema<xxxxxxx>
    {
        categories: { type: [categorySchema], required: true },     // categorySchema instead of Category type
        name: { type: String, required: true }
        qty: { type: Number, required: true }
        price: { type: Number, required: true }
    },
    { timestamps: true }
);

export default model("Product", productSchema);

it fails as well

thanks

Tags:

2

Answers


  1. 0

    You can give a reference to the category model in the product schema. Use this it will help you.

    categories: [{ type: Schema.Types.ObjectId, ref: "Category", required: true }],
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  2. 0

    You can reference the Category model in both cases:

    const categorySchema = new Schema(
  {
    parent: { type: Schema.Types.ObjectId, ref: 'Category' },
    name: { type: String, required: true },
  },
  { timestamps: true }
);

const productSchema = new Schema(
  {
      categories: [{ 
        type: Schema.Types.ObjectId, 
        ref: 'Category',
        default: []
      }],
      name: { type: String, required: true }
      qty: { type: Number, required: true }
      price: { type: Number, required: true }
  },
  { timestamps: true }
);

    You will need to populate the categories on retrieval:

    Category.find().populate('parent').exec();
Product.find().populate('categories').exec();
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