[MST] Loading Data from the Server using lifecycle hook

Let's stop hardcoding our initial state and fetch it from the server instead.

In this lesson you will learn:

• Set up basic data fetching
• Leverage the afterCreate lifecycle hook to automatically run any setup logic a model instance needs to do after creation

export const Group = types

    .model({

        users: types.map(User)

    })

    .actions(self => ({

        // lifecycle hook

        afterCreate() {

            self.load()

        },

        load: flow(function* load() {

            const response = yield window.fetch(`http://localhost:3001/users`)

            applySnapshot(self.users, yield response.json())

        })

    }))