meteor js simpleschema Index with pattern already exists with different options

Question

I'm using meteor js w/ simple-schema and getting

MongoError: Index with pattern: { username: 1 } already exists with different options

My schema around the db.users collection is

Schema = {};

Schema.User = new SimpleSchema({
...
 username: { 
     type: String, 
     unique: true, 
     regEx: /^[a-z0-9]{3,32}$/ , 
     max: 32,
     min: 3 },
...
});

I've dropped the index in mongodb but am still getting the error when I restart my app. Anyone come across this ?

Answer 1

Meteor comes with some default indexes on the users collections. From accounts-base :

/// DEFAULT INDEXES ON USERS
Meteor.users._ensureIndex('username', {unique: 1, sparse: 1});
Meteor.users._ensureIndex('emails.address', {unique: 1, sparse: 1});
Meteor.users._ensureIndex('services.resume.loginTokens.hashedToken',
                          {unique: 1, sparse: 1});
Meteor.users._ensureIndex('services.resume.loginTokens.token',
                          {unique: 1, sparse: 1});
// For taking care of logoutOtherClients calls that crashed before the tokens
// were deleted.
Meteor.users._ensureIndex('services.resume.haveLoginTokensToDelete',
                          { sparse: 1 });
// For expiring login tokens
Meteor.users._ensureIndex("services.resume.loginTokens.when", { sparse: 1 });

I have not checked but I'm guessing unique: true may be the part of your schema that is conflicting with the above.

Answer 2

you can perfectly merge your schema with the existing one where index and unique is already set for username and email. as you only remove them by setting them explicitly to false they will remain.