Function: genericRename

Enterprise Edition

Goal: Recursively and Generically Rename Keys in a document.

This function genericRename shows how a document can have its keys or fields renamed.
Requires Eventing Storage (or metadata collection), a "source" collection, and a "destination" collection.
Will operate on all documents where doc.type === "my_data_to_rename".
Will write transformed or flattened documents to the destination collection with the same type and id.
The destination collection can be shared (or replicated via XCDR to a business partner - maybe to AWS, GCP, or Azure).
Will also remove the transformed document in the destination collection when the original source document is removed.
Note since the document is not available during an OnDelete we will filter by KEY prefix starting with "my_data_to_rename:".

genericRename
Input Data/Mutation
Output Data/Mutation

// To run configure the settings for this Function, genericRename, as follows:
//
// Version 7.1+
//   "Function Scope"
//     *.* (or try bulk.data if non-privileged)
// Version 7.0+
//   "Listen to Location"
//     bulk.data.source
//   "Eventing Storage"
//     rr100.eventing.metadata
//   Binding(s)
//    1. "binding type", "alias name...", "bucket.scope.collection", "Access"
//       "bucket alias", "dst_col",       "bulk.data.destination",   "read and write"
//
// Version 6.X
//   "Source Bucket"
//     source
//   "MetaData Bucket"
//     metadata
//   Binding(s)
//    1. "binding type", "alias name...", "bucket",     "Access"
//       "bucket alias", "dst_col",       "destinaton", "read and write"

function renamePartsByMap(obj, rename_map) {
    if (obj !== null && typeof obj == "object") {
        Object.entries(obj).forEach(([k, v]) => {
            if (obj[k] && typeof obj[k] === 'object') {
                // recurse
                renamePartsByMap(obj[k], rename_map)
            }
            if (obj[k]) {
                // recurse
                var tst = rename_map[k];
                if (tst) {
                    if (tst !== undefined && tst !== null) {
                        obj[rename_map[k]] = obj[k];
                        delete(obj[k]);
                    }
                }
            }
        });
    }
    return obj;
}

function OnUpdate(doc, meta) {
    if (doc.type !== "my_data_to_rename") return;

    // rename long fields to shorter names using a MAP
    var rename_map = {
        "a_first_super_long_name_right_here": "a_short1",
        "a_second_super_long_name_right_here": "a_short2",
        "a_third_super_long_name_right_here": "a_short3"
    };
    var newdoc = renamePartsByMap(doc, rename_map);

    // alias dst_col to our source collection. Since rev 6.5+ allowed to be in r/w mode
    dst_col[meta.id] = newdoc;
}

function OnDelete(meta, options) {
    // filter
    if (!(meta.id.startsWith("my_data_to_rename:"))) return;

    log("OnDelete expired=" + options.expired +" REM id: "+meta.id);
    try {
        delete dst_col[meta.id];
    } catch (e) {
        log("Error on delete: "+e+", id:",meta.id);
    }
}

INPUT: KEY my_data_to_rename::1001

{
  "type": "my_data_to_rename",
  "id": 1001,
  "a_first_super_long_name_right_here": 111,
  "b": "my object",
  "c": "",
  "d": null,
  "f": {
    "m": {
      "a": "asd"
    }
  },
  "f2": {
    "m": {
      "a": "asd",
      "a_second_super_long_name_right_here": 222,
      "ary1": [
        {
          "a_second_super_long_name_right_here": 1
        },
        {
          "a_second_super_long_name_right_here": 2
        },
        [
          {
            "a_second_super_long_name_right_here": 1
          },
          {
            "a_second_super_long_name_right_here": 2
          }
        ]
      ]
    }
  },
  "a_third_super_long_name_right_here": {
    "x": 1,
    "y": 2,
    "not_a_key_will_not_change": "a_third_super_long_name_right_here"
  }
}

UPDATED/OUTPUT: KEY my_data_to_rename::1001

{
  "type": "my_data_to_rename",
  "id": 1001,
  "b": "my object",
  "c": "",
  "d": null,
  "f": {
    "m": {
      "a": "asd"
    }
  },
  "f2": {
    "m": {
      "a": "asd",
      "ary1": [
        {
          "a_short2": 1
        },
        {
          "a_short2": 2
        },
        [
          {
            "a_short2": 1
          },
          {
            "a_short2": 2
          }
        ]
      ],
      "a_short2": 222
    }
  },
  "a_short1": 111,
  "a_short3": {
    "x": 1,
    "y": 2,
    "not_a_key_will_not_change": "a_third_super_long_name_right_here"
  }
}