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My pipeline intermediate result looks like this:

[
  {
    "claim": [
      {
        "_id": "1-8101-2023-0445722",
        "data_accadimento": {"$date": "2023-11-30T00:00:00.000Z"},
        "index": 180,
        "rainValue": 26.290000000000006,
        "hailValue": 0,
        "inundationValue": -1.7223792589410434,
        "windValue": 5.940000057220459,
        "lightningValue": 0
      }
    ]
  },
  {
    "claim": [
      {
        "_id": "1-8101-2023-0445722",
...
]

I am trying to access rainValue inside a $project stage by doing:

{
    $project: {
        claimRainValue: "$claim.0.rainValue"
    }
  },

However the result is an empty array.

Why? The number of elements inside the claim array is one.

本文标签： aggregation frameworkUnable to access first element of array in mongodb pipelineStack Overflow

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