falcor/lib/set/setValue.js

A JavaScript library for efficient data fetching.

var jsong = require("falcor-json-graph");
var ModelResponse = require("./../response/ModelResponse");
var isPathValue = require("./../support/isPathValue");

module.exports = function setValue(pathArg, valueArg) {
    var value = isPathValue(pathArg) ? pathArg : jsong.pathValue(pathArg, valueArg);
    var pathIdx = 0;
    var path = value.path;
    var pathLen = path.length;
    while (++pathIdx < pathLen) {
        if (typeof path[pathIdx] === "object") {
            /* eslint-disable no-loop-func */
            return new ModelResponse(function(o) {
                o.onError(new Error("Paths must be simple paths"));
            });
            /* eslint-enable no-loop-func */
        }
    }
    var self = this;
    return new ModelResponse(function(obs) {
        return self.set(value).subscribe(function(data) {
            var curr = data.json;
            var depth = -1;
            var length = path.length;

            while (curr && ++depth < length) {
                curr = curr[path[depth]];
            }
            obs.onNext(curr);
        }, function(err) {
            obs.onError(err);
        }, function() {
            obs.onCompleted();
        });
    });
};