How to aggregate data from references in mongodb?

@larissa 

To aggregate data from references in MongoDB, you can use the MongoDB Aggregation Framework. Here is a step-by-step guide on how to aggregate data from references in MongoDB:

1. Create a pipeline that includes a $lookup stage to join the collections based on the reference field:

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db.collection.aggregate([
   {
      $lookup: {
         from: "reference_collection",
         localField: "reference_field",
         foreignField: "_id",
         as: "joined_data"
      }
   }
])

1. Replace collection and reference_collection with the names of your collections and reference_field with the field that references the other collection.
2. The $lookup stage will join the collections based on the reference field and create a new field called joined_data that contains the joined data.
3. You can then further manipulate the data using other aggregation stages like $project, $unwind, $match, etc.
4. Finally, you can execute the aggregation pipeline using the aggregate() method.

By following these steps, you can aggregate data from references in MongoDB using the Aggregation Framework.