mongoose-index

mongoose-index.ts

import * as Mongoose from 'mongoose'

Mongoose.connect('mongodb://localhost/test')

Mongoose.set('debug', true)

const schema = new Mongoose.Schema({
  a: {
    type: String,
  }
})

schema.index({a: 1}, {unique: true, partialFilterExpression: {$type: 'string'}})

const model = Mongoose.model('t', schema)

async function main() {
  const doc = new model({
    a: Math.random().toString()
  })
  await doc.save()
}

main()
  .then(() => console.log(123))
  .catch(console.error)