I am new to google datastore. Looking at mapping between entities (Java)

[tonycavanagh1929]

Working through the examples, if I have say an entity person that has an entity address. I could create a EmbeddedEntity and add that to a Entity as a one to one mapping, I could even create a list make it a one to many.

is that the only way, if I want separate storage, for say an object, with a one to many mapping to another, would I first have to pull that first object back, which will contain a list of keys, I then use those keys to bring back the many objects.

Or is there a way of pulling an object, and it will pull all the other objects mapped to it. (Not using EmbeddedEntity).

Thank you for any help.

Regards Tony.

[George (Cloud Platform Support)]

Hello Tony, 

You seem to think along the lines of SQL databases. Cloud Datastore is a highly-scalable NoSQL database for your applications. Entities in a Datastore mode database form a hierarchically structured space similar to the directory structure of a file system. When you create an entity, you can optionally designate another entity as its parent; the new entity is a child of the parent entity (note that unlike in a file system, the parent entity need not actually exist). An entity without a parent is a root entity. 

Your desired functionality may be realized by way if indexes.