Cannot specify a custom index on _id

[burakkilic]

Hi,

I'm getting

mongoose: Cannot specify a custom index on `_id` for model name "Shop", MongoDB does not allow overwriting the default `_id` index. See http://bit.ly/mongodb-id-index

after upgrading Mongoose to 5.x

How can I solve that? Do you have any idea?

[hom]

@burakkilic If you want to make _id shortly, you can use shortid when you create the model.
such as this:

const shortid = require('shortid');

module.exports = app => {
  const mongoose = app.mongoose;
  const Schema = mongoose.Schema;

  const UserSchema = new Schema({
    _id: { type: String, default: shortid.generate() },
    username: { type: String  },
    password: { type: String  },
  });

  return mongoose.model('User', UserSchema);
}

or if you want to rewrite _id, you must get the mongodb client instant and save the _id yourself.

[privateOmega]

@burakkilic If you want to make _id shortly, you can use shortid when you create the model.
such as this:

const shortid = require('shortid');

module.exports = app => {
  const mongoose = app.mongoose;
  const Schema = mongoose.Schema;

  const UserSchema = new Schema({
    _id: { type: String, default: shortid.generate() },
    username: { type: String  },
    password: { type: String  },
  });

  return mongoose.model('User', UserSchema);
}

or if you want to rewrite _id, you must get the mongodb client instant and save the _id yourself.

Pass shortid.generate instead of shortid.generate()