Atlas Mongo Triggers & Match Expressions

MongoDB Atlas
1

I am testing out Atlas Triggers and cannot get the Mach Expressions working.

I am inserting a simple document that looks like this:

   {
    "description": "Insert Test",
    "notify": true,
    "createdAt": new Date(),
    "userId": "1234567890"
}

If I leave the match expression as an empty object {} , the trigger works as expected and I see the event on the AWS EventBridge.

If I add the following Match Expression:

{ 
"notify" : true
}

The trigger no longer executes and I do not see the event on the AWS Event Bridge. Am I configuring the Match Expression inaccurately? I only want the trigger to execute when the notify field is set to true

Thanks

2

Hi – For the match expression in the Trigger, you will want to match on the Change Event format vs. the document itself. Specifically, I think that field will be located within the either updateDescription / fullDocument fields depending on how you have configured the Trigger.

3

Hi @Drew_DiPalma, can you supply an example based on the document example I supplied in the original question?

I tried { "fullDocument.notify": true }

and

{
 "updateDescription.updatedFields": {
  "notify":true
 }
}

Neither worked.

Thanks.

4

Have you tried –
{
“updateDescription.updatedFields.notify”:true
}

5

I tried

{
“updateDescription.updatedFields.notify”:true
}

Still not working, keep in mind this is for an insert event, not an update.

Thanks.

6

Figured this out, in order for this to work you need to enable the Full Document option in the trigger settings. Then the following Match Expression will work:

{
“fullDocument.notify”:true
}

This post was also helpful

Thanks

7

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