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MongoDBのaggregateでフィールド同士を比較

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調べてもすぐに分からなかったので残しておきます。

[fieldA]の値と[fieldB]の値が一致するデータのみを取得する場合の例。

db.collection.aggregate([
  {
    $match: {
      $expr: {
        $eq: ['$fieldA', '$fieldB']
      }
    }
  },
]);
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