Firebase .indexOn dynamic keys

Question

I\'ve started testing Firebase and I can\'t figure out one thing about indexing. I\'m creating a structure based on what I\'ve read on - Firebase Data Structuring - somethin

Answer 1

For this type of query (and in general when you get into requiring adding indexes dynamically) you'll likely need to set up an inverted index. In your case:

{
  "babies" : {
    "-KQSVCXI-ZMz_lQ_Q906" : {
      "name" : "Baby",
      "parents" : {
        "F0o8Gr5GC2SrakUYZpC20efcmk63" : true
      }
    },
    "-KQSf4t9XQC3LnbsxLYS" : {
      "name" : "Name2",
      "parents" : {
        "S6aO6Dx4lgg6anW9S9hu7EJrhVg1" : true
      }
    }
  },
  "parents": {
    "F0o8Gr5GC2SrakUYZpC20efcmk63": {
      "babies": {
        "-KQSVCXI-ZMz_lQ_Q906": true
      }
    },
    "S6aO6Dx4lgg6anW9S9hu7EJrhVg1": {
      "babies": {
        "-KQSf4t9XQC3LnbsxLYS": true
      }
    }
  }
}

This type of bidirectional linking is fairly common in Firebase (and in many similar NoSQL databases).