chainable api?

apigist.js

//Fetch data from the API using dot notation.
//Only used when the dot notation will result in a valid URI
ApiClient.fetchData("parent_employers.2.work_sites")
			.done((data) => {
        			console.log(data);
     			});

//More advanced chaining
//Fetch data from the api using chained functions
ApiClient.parent_employers({id: 2})  //params replace templated uris
		 .work_sites({id: 1})
		 .departments({page: 1})
 		 .fetch()  //returns a promise
 		 .then(doSomething); 


const api_client = {
	var builturi = "api/v1";
	parent_employers(params) { 
		//do some magic to add the templated uri to the build uri
		builturi += uri_components.parent_employers.expand_uri(params);
		return this;
		//returns back api_client instance
	},
	work_sites(params) { 
		builturi += uri_components.work_sites.expand_uri(params);
		return this;
		//returns back api_client instance
	},
	fetch() {
		return request(builturi);  //return ajax request of built uri
	}

}


const uri_components = {

	parent_employers: {
		templates: {
			get_by_id: "/parent_employers/{id}",
			list: "/parent_employers{?page}{?blah}"
		},		
	},
	work_sites: {
		templates: {
			get_by_id: "/work_sites/{id}",
			list: "/work_sites{?page}{?params}"
		}
	}

	//....
}		 

		function make_uri(rel, params) {			
			if (params.id typeof number)
				return uri_components[rel].templates.get_by_id
							.replace({id}, params.id);
			else
				return //code to replace the other templates
		}