Hi Dave,

try this for explanations on entity groups:
http://code.google.com/appengine/docs/python/datastore/keysandentitygroups.html#Entity_Groups_Ancestors_and_Paths

didier

On Oct 3, 11:59 pm, Dave Hicks <[email protected]> wrote:
>   I'm having problems understanding how to get entities to play nice
> together.  So, I'd like to find a good tutorial on how to work with
> entity groups using JPA.
>
> My specific issue, right now, is being unable to add a new entity to a
> collection that is held by a parent entity.  When I attempt to add a new
> entity to the collection of children, I always get an error indicating
> that the entity group is incorrect.  I just haven't been able to find
> any information about how to make this work.
>
> Thanks for any tips/links.
> Dave

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