Current base model hierarchy

gistfile1.js

    /** MODEL COMPONENT HIERARCHY **/
    
    fluid.initSimpleModel = function (that, optionsModel) {
        return that.model = optionsModel || {};
    };
    
    fluid.initRelayModel = function (that, optionsModel, applier) {
        return optionsModel || {};
    };
    
    fluid.establishModelRelay = function (that, model, optionsModel, optionsML, applier) {
        // build up here
        fluid.mergeModelListeners(that, optionsML);
        applier.initModelEvent();
    };
    
    // Grade common to "old" and "new" model components
    fluid.defaults("fluid.commonModelComponent", {
        gradeNames: ["fluid.littleComponent", "autoInit"],
        mergePolicy: {
            modelListeners: fluid.makeMergeListenersPolicy(fluid.arrayConcatPolicy)
        }
    });
    
    fluid.defaults("fluid.modelComponent", {
        gradeNames: ["fluid.commonModelComponent", "autoInit"], 
        members: {
            model: "@expand:fluid.initSimpleModel({that}, {that}.options.model)",
            applier: "@expand:fluid.makeChangeApplier({that}.model, {that}.options.changeApplierOptions)",
            modelListeners: "@expand:fluid.mergeModelListeners({that}, {that}.options.modelListeners)"
        },
        mergePolicy: {
            model: "preserve"
        }
    });
    
    fluid.defaults("fluid.modelRelayComponent", {
        gradeNames: ["fluid.commonModelComponent", "fluid.eventedComponent", "autoInit"],
        members: {
            model: "@expand:fluid.initRelayModel({that}, {that}.options.model, {that}.applier)",
            applier: "@expand:fluid.makeHolderChangeApplier({that}, {that}.options.changeApplierOptions)",
            modelRelay: "@expand:fluid.establishModelRelay({that}, {that}.model, {that}.options.model, {that}.options.modelListeners, {that}.applier)"
        },
        mergePolicy: {
            modelRelay: fluid.arrayConcatPolicy
        }
    });