[SOLVED] Where MongoDB ensureIndex() must be called in JAX-RS/MongoDB/Jackson application?

Where MongoDB ensureIndex() must be called in JAX-RS/MongoDB/Jackson application?

I'm following this example for creating a simple Web application using JAX-RS, MongoDB and Jackson mapper:

Modern Web Apps using JAX-RS, MongoDB, JSON, and jQuery | Architects Zone, by James Ward (2012-04-29), original source: jaxrsbars/README.md at master · jamesward/jaxrsbars · GitHub

Where should I call MongoDB's ensureIndex() if I'd like to have some fields indexed?

Solution

You can call ensureIndex() any time to start indexing fields. It's a blocking call so you will not be able to use the collection while the index is being built.

If you are looking for the function prototype to call from jackson, this might help:

http://vznet.github.com/mongo-jackson-mapper/apidocs/net/vz/mongodb/jackson/JacksonDBCollection.html#ensureIndex(com.mongodb.DBObject)

You can also use the command db.example.ensureIndex( {<field>: 1 } ) at the mongo shell to start the indexing procedure.