json - Adding Layer using esriRequest Response in ArcGIS API for JavaScript?

For various reasons I need to add layers to a map object using a response returned by an esriRequest to an ArcGIS Server. One reason being the data will change constantly and hard coding FeatureLayer URLs would prove inefficient.

I have successfully been able to return a JSON object containing attribution that appears to be the same data one would see on the layers REST node.

 maps = [];


require([
    "esri/map", "esri/layers/FeatureLayer", 
    "esri/dijit/Print", "esri/tasks/PrintTemplate", "esri/request", 
    "esri/config","esri/dijit/BasemapToggle",

    "dojo/_base/array", "dojo/dom", "dojo/parser",  "dojo/domReady!"

], function (Map, FeatureLayer,Print, PrintTemplate, esriRequest,      esriConfig,BasemapToggle,arrayUtils, dom, parser){


parser.parse();

console.log("Map Start");

esriConfig.defaults.io.proxyUrl = "http://........./proxy.ashx";

maps.addRespLyrs = function addRespLyrs (layer) {
    if (layer.type == "Feature layer") {
        console.log(layer.name);
        maps.map.addLayer(layer);

    }
}; 

maps.handleMapInfo = function handleMapInfo (resp) {
    console.log("handleMapInfo called");
    maps.layers = resp.layers;
    console.log(maps.layers);
    for (i in maps.layers) {
        var layer = maps.layers[i];
        maps.addRespLyrs(layer);

    }
};

maps.layerRequest = function layerRequest () {
    var mapInfo = esriRequest({
        "url": "https://........./Application Name/MapServer/layers",
        "content" : {"f":"json"},
        "handleAs" : "json",
        "callbackParamName" : "callback"
    });

    mapInfo.then(maps.handleMapInfo);
};

maps.map = new Map("cpCentCent", {
    basemap:"topo",
    center: [-98.5795, 39.8282],
    zoom: 5
});



console.log("Map End");

When attempting to add the data using the addLayer() method I recieve an error thrown from deep with in esri's API.

init.js:199 TypeError: a.id.match is not a function(…) "TypeError: a.id.match is not a function

Any thoughts as to what could be going wrong here or how to create a layer from my JSON?

Answer

I think you need to be using esri/layers/FeatureLayer somewhere in here, because the maps.map.addLayer method is expecting a layer class as input. It looks like you're just passing in a json object instead of a layer class object.

Trap the URL from your esriRequest and build a new FeatureLayer from it, something like:

featLayer = new FeatureLayer(urlFromRequest);
maps.map.addLayer(featLayer);