DocumentDB Sub Query

Question

I am trying to project from a large document containing a double nested array, into a flattened representation of the array, and I am stuck on how to proceed.

I have doc

Answer 1

DocumentDB support for sub-queries is planned, but not currently supported. Meanwhile, UDFs or pulling the data client side as N records, then re-formatting is the best way to do this today. For others interested, here's a UDF for returning the results in the query,

function transform(doc) {
    var result = {};

    for (var prop in doc) {
        if (prop != "componentGroups") {
            result[prop] = doc[prop];
        } else {
            result["components"] = [];
            for(var cgidx in doc["componentGroups"]) {
                var componentGroup = doc["componentGroups"][cgidx];
                for (var cidx in componentGroup) {
                    var component = componentGroup[cidx];
                    result["components"].push({componentType: component.componentType, enabled: component.enabled });
                }
            }
        }
    }

    return result;
 }