Hello,
If I understand it correctly, it should be possible to create projection, which show values of aggregate root. I have this sample code:
var ContactId = Guid.NewGuid();
var ContactCreated = new ContactEvent(new
{
Id = ContactId,
FirstName = “Peter”,
LastName = “Snobelt”
}, “ContactCreated”);
var ContactUpdated = new ContactEvent(new
{
Id = ContactId,
FirstName = “Petr”,
LastName = “Snobelt”
}, “ContactUpdated”);
using(var connection = new EventStoreConnection(new System.Net.IPEndPoint(ipaddress, 1113))) {
connection.AppendToStream(“Contacts”, -2, new[] { ContactCreated, ContactUpdated });
Console.WriteLine(“Stored”);
}
``
I expect it should be possible to create 2 projections, first which return all contacts (useful for grids) and second which return values per contact (used on details). But I don’t know how to create these projections,especially second projection (I expect it should be available on url which contains ContactId).
Is there any sample of these 2 projections? I try to look at chat sample, but it looks it replay events on client and not on server.
Maybe I just did not understand exactly how to work with projections 
Thanks
Petr,
There are two ways how one can consume projection results.
- Current projection state can be retrieved with an http request to the “/projection/{name}/state”
2) The last available state of a persistent projection can also be read as the last event from the $projections-"+projectionname+"-state" stream. Persistent projections publish "stateUpdated" events into this stream.
Projections with foreachStream() maintain separate state for each stream they process. As of today they do not support "/projection/{name}/state" http requests (this is on priority list)
However, you can still retrieve the most recent state for persistent foreachStream() projections from streams named after this pattern:
$projections-{projection_name}-{aggregated_stream_name}-state"
-yuriy
Petr,
Now, it is possible to retrieve a state of any projection partition via http with
“/projection/{name}/state?partition={partition}”
where partition is a stream name in case of foreachStream().
Pushed to dev for now.
-yuriy
Petr,
You can now choose a name of the stream to write StateUpdated event to.
The following statement configures a projection to write events to the stream named “state-updates”.
options({
stateStreamName: ‘state-updates’,
});
In case of a forteachStream() projection the stateStreamName options requires {0} placeholder which will be replaces with the currently processed stream name.
-yuriy