(Quick Reference)
index
Purpose
Defines properties that should be indexed by MongoDB
Examples
class Book {
String title
Date releaseDate
Author author
String ISBN static indexes = {
idx_isbn unique:true, dropDups:true, fields:[desc('ISBN')]
idx_author sparse:true, fields:[asc('author')]
idx_book fields:['author', desc('title')] // asc is the default direction
}
}Description
Syntax is the following:
<index name> <index properties>
Where <index properties> may be:
- unique: guarantees that no two documents have the same values for given fields. Defaults to false
- dropDups: if you create unique indexes on existing data, setting dropDups to true tells MongoDB to drop documents with same unique values. Defaults to false
- sparse: creates a sparse index. Defaults to false
- fields: a list of fields that should be indexed. You can set the index direction by enclosing the property names by the sorting keywords
asc or desc.
See also
.