Unable to set cluster on trigger creation for collection-level trigger

Juanjo_Martin_Cara · 2025-03-12T11:34:15.408Z

Hello,
I am trying to create a new trigger on a free tier cluster. The trigger is of database type and at the collection level. However, when I attempt to set the cluster, I do not see any options available.
As you can see on this screenshot

image2355×507 37 KB

Thanks

Diego_Freniche · 2025-03-12T11:43:55.001Z

Hi @Juanjo_Martin_Cara and welcome to the MongoDB Forums!

Just tried it on an AWS, free tier M0 cluster and I’m able to select my cluster. I just went through these two screens:

Screenshot 2025-03-12 at 12.38.361720×805 86.9 KB

And then:

Screenshot 2025-03-12 at 12.39.432279×1029 145 KB

Can you try to create a new project in your organization, then create a new free cluster in a different cloud provider / region to find the root cause of the error?

Again, welcome to the MongoDB community and hope this helps!

Paolo_Manna · 2025-03-12T12:12:53.020Z

Hi @Juanjo_Martin_Cara ,

Juanjo_Martin_Cara:

However, when I attempt to set the cluster, I do not see any options available.

This is usually because there’s no Data Source linked to the application that contains the Trigger: there’s a Linked Data Sources menu item on the left, ensure that the page contains a reference (Service Name) to the Cluster you want to work with.

Juanjo_Martin_Cara · 2025-03-14T15:02:07.333Z

This is it! The data source was not selected.
I find it a bit unintuitive that this option is literally the last one in the list but I added my cluster there and solved the issue.
Thanks!

system · 2025-03-19T15:02:30.200Z

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