Retrieving all keys in a PState

[jacob franco]

So I have this simple PState, teamIdToTeam, which maps a team's id (Integer) to the team object, and we want to just get all of the ids from the PState. 

I attempted to get all of the keys like so:



But I'm getting an error of: InvalidQueryPathException: null {} and I'm not really sure why.  I know that the PState is populated properly and we know that the PState is a map schema mapping an Integer to a Team.  I thought that Path.all().mapKeys() would just give me all the keys in the PState as a list. 

Any insight is appreciated!

[Nathan Marz]

A foreign PState select queries one partition of the PState, so the invoke needs to know which partition to query. By default this is done by using the key in a leading "key" navigator in the path. Alternatively, you can specify the partitioning key explicitly via a different variant of "select". If you want to query all partitions of a PState, you should make a query topology.

Some resources from the docs regarding this:

• https://redplanetlabs.com/docs/~/pstates.html#_using_pstate_clients
• https://redplanetlabs.com/docs/~/query.html
• https://redplanetlabs.com/javadoc/com/rpl/rama/PState.html#select-java.lang.Object-com.rpl.rama.Path-

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[jacob franco]

Okay yeah, just making a topology querying all partitions worked.  Thanks!