# Using Models

# Server-Side Code

When implementing code in your Hitchy-based project you might have defined models using Model.define(). Any model defined that way is returned from invoked Model.define() and can be used right away. However, when defining models via filesystem by placing model definition files in folder api/models of your Hitchy-based project those models are exposed via Hitchy's runtime API. This API is available in context of dispatched requests and therefore can be used in policy and route handlers.

Let's pretend there is a file api/models/user.js like this one:

module.exports = {
	props: {
		loginName: {},
		password: {},

This would establish prerequisites for using a controller file api/controller/user.js like this one:

module.exports = {
	getByLoginNameAction( req, res ) {
		const { User } = this.api.runtime.models;
		User.find( { eq: { name: "loginName", value: req.params.name } } )
			.then( matches => res.json );

The name of controller file doesn't matter here, though. The essential part is how the code is accessing the runtime API in context of a controller function. The same applies to policy handlers. Arrow functions don't work here due to using this for accessing the model.

The common API of models is providing additional information for use in server-side code.

# Client-Side Code

Accessing models from client-side code is beyond the scope of this plugin. Exposing models over the network is a job you need to implement yourself using server-side code.

As an option you might add an existing plugin that implements particular API for accessing models over the network. One of those plugins is hitch-plugin-odem-rest.