I have an entity that has a class containing a MapString,String
called data - I then convert this to an entity using the method below
private Entity toEntity()
{
Entity entity = new Entity(KIND, this.getName());
if (data == null || data.isEmpty())
{
return entity;
}
for (Map.EntryString, SetString paramEntry : this.data.entrySet())
{
if (paramEntry.getKey() == null || paramEntry.getValue() ==
null ||
paramEntry.getValue().isEmpty())
{
continue;
}
entity.setUnindexedProperty(paramEntry.getKey(),
paramEntry.getValue());
}
return entity;
}
and an opposite
private static MyClass fromEntity(Entity e)
method.
You could equally apply a collection to the map, for example the type
MapString,SetString (I've used Set because the order is not
guaranteed by App Engine). Then you could have more than one entry
with the same name - you'll just need to manage that in your classes
somehow.
Thanks,
Mat.
P.S. I know I should have used a DAO for this, but it's a quick and
dirty solution for now, I'm not sure I'll be using it long term - I
might use namespaces for the same task.
On 3 November 2011 11:23, Mr. Schtief lisc...@gmail.com wrote:
Hi,
I'm using low level API for creating and managing Entitities. I have a Kind
of Entity that can have unlimited name value pairs. Should i add them as
properties or should i create a new kind of entity with the two properties
name value and link them to the parent entity.
putting them as properties in the parent entity seems the best way for me,
but then i have the problem of the datastore viewer which will display all
possible properties for all entities, so the viewer page would be very wide.
The other problem is, that i cannot use multiple values for the same
property name. right?
would do you suggest
schtieF
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