model.borrow.js

import mongoose from 'mongoose';
const {Schema} = mongoose;

export default mongoose.model(
  'borrow',
  new Schema(
    {
      book_id: {type: String, default: ''},
      book_user_id: {type: String, default: ''},
      book_username: {type: String, default: ''},
      book_address: {type: String, default: ''},
      book_name: {type: String, default: ''},
      book_price: {type: Number, default: 0},
      request_user_id: {type: String, default: ''},
      request_username: {type: String, default: ''},
      request_address: {type: String, default: ''},
      message: {type: Array, default: []},
      state: {type: Number, default: 1, commit: '1:normal,2:confirm,3:refuse,4: return'},
    },
    {
      timestamps: {createdAt: 'create_time', updatedAt: 'update_time'},
      toJSON: {
        virtuals: true,
        transform(doc, ret) {
          delete ret.__v;
          delete ret._id;
          return ret;
        },
      },
    },
  ),
);