Item - Category - Mongoose

Category.js

const mongoose = require("mongoose");
const slugify = require("slugify");

const CategorySchema = new mongoose.Schema({
  name: {
    type: String,
    unique: true,
    trim: true,
    required: [true, "Por favor agregue un nombre"],
  },
  slug: String,
  description: {
    type: String,
  },
  createdAt: {
    type: Date,
    default: Date.now,
  },
  parent: {
    type: mongoose.Schema.ObjectId,
    ref: "Category",
    default: null,
  },
  tag: {
    type: String,
  },
});

CategorySchema.pre("save", function () {
  this.slug = slugify(this.name, { lower: true });
  next();
});

module.exports = mongoose.model("Category", CategorySchema);

Item.js

const mongoose = require("mongoose");
const slugify = require("slugify");

const ItemSchema = new mongoose.Schema({
  name: {
    type: String,
    required: [true, "Por favor agregue un nombre"],
    unique: true,
    trim: true,
    maxlength: [60, "El nombre no puede tener más de 60 caracteres"],
  },
  slug: String,
  description: {
    type: String,
    trim: true,
    maxlength: [400, "La descripción no puede tener más de 400 caracteres"],
  },
  price: {
    type: Number,
    required: [true, "Por favor agregue un precio"],
  },
  quantity: {
    type: Number,
    default: 0,
  },
  code: {
    type: String,
  },
  url: {
    type: String,
  },
  createdAt: {
    type: Date,
    default: Date.now,
  },
  category: {
    type: mongoose.Schema.ObjectId,
    ref: "Category",
  },
  tag: {
    type: String,
  },
});

ItemSchema.pre("save", function () {
  this.slug = slugify(this.name, { lower: true });
  next();
});

module.exports = mongoose.model("Item", ItemSchema);

items_sample.json

{
    "data": [
        {
            "_id": "5f8734cffc3d1d001796c557",
            "name": "Heineken",
            "category": {
                "_id": "5f7e5d0afbb7b4001750c5c5",
                "name": "Cerveza",
            }
        },
        {
            "_id": "5f8734cffc3d1d001796c557",
            "name": "Pilsen",
            "category": {
                "_id": "5f7e5d0afbb7b4001750c5c5",
                "name": "Cerveza",
            }
        },
        {
            "_id": "5f8734cffc3d1d001796c557",
            "name": "Carne",
            "category": {
                "_id": "5f7e5d0afbb7b4001750c5c5",
                "name": "Alimentos",
            }
        },
        {
            "_id": "5f8734cffc3d1d001796c557",
            "name": "Fideos",
            "category": {
                "_id": "5f7e5d0afbb7b4001750c5c5",
                "name": "Alimentos",
            }
        }
    ]
}