mongo-aggregator v1.0.5

npm i mongo-aggregator

There are three methods:

1. expander.expandOne(childPath, projection, childCollectionName) for expand simple (not array) field.

2. expander.expandMany(childPath, projection, childCollectionName) for expand array field.

3. expander.expandManyWithChildProjection = function (childPathName, projection, childProjection, childCollectionName) for expand array field with projection for child documents.

   A result of functions will be aggregation obj.
   
   Next:
   
   // mongoose
   MyModel.aggregate(aggregationObj, function(err, myModels) {
       ...
   });
   
   // or mongo driver
   db.collection('myCollection').aggregate(aggregationObj, function(err, myDocs) {
       ...
   });