falcor/lib/response/set/setGroupsIntoCache.js

A JavaScript library for efficient data fetching.

var arrayFlatMap = require("./../../support/array-flat-map");

/**
 * Takes the groups that are created in the SetResponse constructor and sets
 * them into the cache.
 */
module.exports = function setGroupsIntoCache(model, groups) {
    var modelRoot = model._root;
    var errorSelector = modelRoot.errorSelector;
    var groupIndex = -1;
    var groupCount = groups.length;
    var requestedPaths = [];
    var optimizedPaths = [];
    var returnValue = {
        requestedPaths: requestedPaths,
        optimizedPaths: optimizedPaths
    };

    // Takes each of the groups and normalizes their input into
    // requested paths and optimized paths.
    while (++groupIndex < groupCount) {

        var group = groups[groupIndex];
        var inputType = group.inputType;
        var methodArgs = group.arguments;

        if (methodArgs.length > 0) {
            var operationName = "_set" + inputType;
            var operationFunc = model[operationName];
            var successfulPaths = operationFunc(model, methodArgs, null, errorSelector);

            optimizedPaths.push.apply(optimizedPaths, successfulPaths[1]);

            if (inputType === "PathValues") {
                requestedPaths.push.apply(requestedPaths, methodArgs.map(pluckPath));
            } else if (inputType === "JSONGs") {
                requestedPaths.push.apply(requestedPaths, arrayFlatMap(methodArgs, pluckEnvelopePaths));
            } else {
                requestedPaths.push.apply(requestedPaths, successfulPaths[0]);
            }
        }
    }

    return returnValue;
};

function pluckPath(pathValue) {
    return pathValue.path;
}

function pluckEnvelopePaths(jsonGraphEnvelope) {
    return jsonGraphEnvelope.paths;
}