I have an entity that has a class containing a Map<String,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.Entry<String, Set<String>> 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
Map<String,Set<String>> (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 <[email protected]> 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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