mongodb+aggregation - delete the upper level in the document



  • I've got a collection of document types:

    {fields:{_id:1, f1:10, f2:"репа", f3:200}, computedFields:{id:1}},
    {fields:{_id:2, f1:10, f2:"репа", f3:200}, computedFields:{id:2}},
    ...
    

    Inside the cadet (pipeline), I need to transform every document into:

    {_id:1, f1:10, f2:"репа", f3:200, id:1},
    {_id:2, f1:10, f2:"репа", f3:200, id:2},
    ...
    

    I mean, we need to get rid of the top level by leaving the bottom.

    Please tell me how to do this.



  • Since fields have unique identifiers, you can use the method https://docs.mongodb.org/manual/reference/method/db.collection.distinct/#db.collection.distinct :

    SomeModel.distinct("fields")
    

    This code will return the list. unique facilities fields of all collection facilities SomeModel♪ If you need a repetition, distinct It won't help.




Suggested Topics

  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2