extract.js

// generalize some of the embedded extraction. transforms merchant.locations into ids and returns a list of locations
function extractEmbeddedData(obj, propertyName) {
    var ids = [];
    var embeddedObjs = [];
    if (!Ember.isNone(obj[propertyName])) {
        var subObj = obj[propertyName];
        var isArray = Array.isArray(subObj);
        if (!isArray) {
            subObj = [subObj];
        }
        subObj.forEach(function(subElement) {
            embeddedObjs.push(subElement);
            ids.push(subElement.id);
        });
        obj[propertyName] = isArray ? ids : ids[0];
    }
    return embeddedObjs;
}

App.MerchantSerializer = DS.DjangoRESTSerializer.extend({
    extractSingle: function(store, type, payload) {
        payload.locations = extractEmbeddedData(payload, 'locations');
        return this._super.apply(this, arguments);
    },

    extractArray: function(store, type, payload) {
        var locations = [];
        payload.forEach(function(merchant) {
            extractEmbeddedData(merchant, 'locations').forEach(function(loc) {
                locations.push(loc);
            });
        });
        // payload = {'merchants': payload, 'locations': locations} //<-- this breaks because it expects an array to be returned
        payload.locations = locations;
        return this._super.apply(this, arguments);
    }
});