lookup-query-mongodb.js

/**
 * $lookup
 * from: The target collection.
 * localField: The local join field.
 * foreignField: The target join field.
 * as: The name for the results.
 * pipeline: The pipeline to run on the joined collection.
 * let: Optional variables to use in the pipeline field stages.
 */
{
  from: "movies",
  localField: "movie_id",
  foreignField: "_id",
  as: "movie_info"
}