Ajax Prefixes and Find by ajax query if Spine.Model doesn't exist locally.

spine.ajax.prefix.js

(function(Spine, $){
    if( typeof Spine.Model.Ajax === "undefined") { throw "This plugin is really intended for use with Ajax driven models"; }
    var Model = Spine.Model;
    Model.extend({
	find: function(id) {
	    record = this.records[id];
	    if( !record) {
		var self = this;
		self.ajaxPrefix = self.singletonPrefix();
		$.ajax({
		    url: this.url + "/" + id,
		    dataType: "json",
		    success: function(data){
			item = self.fromJSON(data);
			self.records[item.id] = item;
			self.ajaxPrefix = self.collectionPrefix();
			self.trigger("ajax-find");
		    },
		    error: function(xhr, status, errorThrown){
			throw "Unknown record";
		    }
		});
		return null
	    }
	    return record.clone();
	},

	singletonPrefix: function(){ return this.name.toLowerCase(); },

	collectionPrefix: function(){ return this.name.toLowerCase() + "s"; }
    });
    Model.include({
	persist: function(){
	    this.parent.ajaxPrefix = this.parent.singletonPrefix()
	    this.save();
	    this.parent.ajaxPrefix = this.parent.collectionPrefix();
	}
    });
})(Spine, Spine.$);