Resolving links for projections not working?

EventStoreDB
1

Hello,

I have troubles with resolving links for projections. It seems that ES-ResolveLinkTos header does not work.

Here is the case I have:

We have projections for every EventType we publish.

Then there is an event handler that subscribes to Different event types. We got an issue of receiving events in the wrong order when we’d subscribed just to several streams, so instead, we went with a different solution.

Now we create a Projection via the API that merges all necessary events into one stream while keeping the correct order, and then the event handler subscribes to its own stream.

The generated projection looks like this:

fromStreams(["$et-Events::JobAdTrashed", “$et-Events::JobAdLocaleChanged”])

``

But when we create a subscription to this stream, we don’t see links resolved even though we pass the ES-ResolveLinkTos header.

I still get events that have EventType: $>

Can anyone help me how to resolve it properly when using consume_feed during the continuous subscription?

Thanks in advance

2

Here Is the screen of the stream events I got.

My service name: default

Handler name: DummyHandler5

The stream name created by projection: $projections-default-DummyHandler5-order

I attach two screenshots of the streams and subscription details

projection-stream.png

subscription-edit.png

3

Hi Sebastian,

I got several leads here but just in case, would you care to share the code of your projection and also configuration details?

4

I wrote a client in to generate requests like this one:

curl -i --data ‘fromStreams(["$et-SomethingHappened", “$et-SomethingElseHappened”])’
-u admin:changeit
http://localhost:2113/projections/continuous?name=default-DummyHandler&type=js&enabled=true&emit=true&trackemittedstreams=true

``

When I pass a list of streams to merge dynamically:

My projection code in the event store panel looks like this:

fromStreams(["$et-Events::JobAdTrashed", “$et-Events::JobAdLocaleChanged”])

``

Then the subscription I created for this:

Group
default-DummyHandler
Stream
$projections-default-DummyHandler-order
Configuration
Resolve Link Tos
Start From
0
Message Timeout (ms)
10000
Extra Statistics
Max Retry Count
5
Live Buffer Size
500
Buffer Size
500
Read Batch Size
20
CheckPoint After (ms)
1000
Min CheckPoint Count
10
Max CheckPoint Count
500
Max Subscriber Count
10

``

Then the stream generated by this projection: $projections-default-DummyHandler

43
21@$et-SomethingHappened
$>
2020-03-13 16:37:02
JSON
42
21@$et-SomethingElseHappened
$>
2020-03-13 16:37:02
JSON
41
20@$et-SomethingHappened
$>
2020-03-13 16:37:02
JSON

And when I’m trying to read it, the links are not resolved…

5

Just FYI: the checkboxes in the previous post are unchecked ONLY because of the Google Groups formatting issue. They ARE checked in the config.