Hey, I'm trying to work with relative dates, so like apply rule for users that signed up before a month ago being dynamic, so in the next day, so when users reach 1 month, have the rule enabled. So I created the following query:

{
  "$expr": {
    "$lte": [
      "$createdAt",
      {
        "$subtract": [
          "$$NOW",
          2592000000
        ]
      }
    ]
  }
}

But I saw the operations are done manually in the code, I thought there was a mongo memory server running under the hood to allow do any mongo query. And there isn't support for the

$expr

operator (it does work outside aggregations). Is there any plan to support relative date to do something like this? E.g

$$NOW - number

We just adopted the Mongo query syntax since it's easy to read and write. Our SDKs have a custom built rules engine that supports a subset of that query language. I have a feeling that

$expr

might be difficult to implement and cause the size of the SDKs to increase substantially. For relative time operations, the easiest solution right now is to add a dynamic attribute like

daysSinceSignUp

Got it, thaaanks! The

daysSinceSignUp

sounds like a nice solution