I am trying to figure out how to put 2 parent/child entities into the
mutationPool, inside a MapReduce job.
Here is my issue : in my understanding, as the mutationPool is asynchronous
, I cannot expect to get the parent entity key back from the
mutationPool.put() method.
Or can I ?
According to you, would the following code work or not ?
[Š]
//Creation of the parent entity
Entity parent = new Entity("ParentClass");
parent.setProperty("fieldA", valueA);
mutationPool.put(parent);
//Creation of the child entity
Entity child = new Entity("ChildClass", parent.getKey()); //Q: Can I expect
that the key is returned directly after the mutationPool.put() method ?
child.setProperty("fieldX", valueX);
mutationPool.put(child);
[Š]
From: "Ikai Lan (Google)" <ikai.l+gro...@google.com>
Reply-To: <google-appengine-java@googlegroups.com>
Date: Mon, 13 Sep 2010 14:15:30 -0700
To: <google-appengine-java@googlegroups.com>
Subject: Re: [appengine-java] query for null <missing> properties
You can't. Empty properties are the equivalent of unindexed properties.
You'll need to iterate over all the Entities in your datastore and update
them. The Mapper API is a very good tool for this:
http://code.google.com/p/appengine-mapreduce/
On Mon, Sep 13, 2010 at 12:20 PM, Benjamin <bsaut...@gmail.com> wrote:
> Brain freeze guys -
>
> I added a property to my object and persisted in the datastore. The
> older object have now have a column that when viewed in the control
> panel have a value of <missing>. I need to query those objects so i
> can update them - propname == null , propname == "" - I can't seem
> to find the right syntax for this.
>
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