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Simplifies the "All we want to do..." portion #281

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Nov 29, 2018
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Simplifies the "All we want to do..." portion #281

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Simplifies the "All we want to do..." portion
zachgarwood Nov 19, 2018
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Update guides/v3.5.0/tutorial/routes-and-templates.md
Nov 27, 2018
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30 changes: 14 additions & 16 deletions guides/v3.5.0/tutorial/routes-and-templates.md
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Expand Up @@ -219,22 +219,13 @@ Unlike the other route handlers we've made so far, the `index` route is special:
it does NOT require an entry in the router's mapping.
We'll learn more about why the entry isn't required later on when we look at [nested routes](../subroutes/) in Ember.

All we want to do when a user visits the root (`/`) URL is transition to `/rentals`.
To do this we will add code to our index route handler by implementing a route lifecycle hook,
called `beforeModel`.

Each route handler has a set of "lifecycle hooks", which are functions that are invoked at specific times during the loading of a page.
The [`beforeModel`](https://www.emberjs.com/api/ember/release/classes/Route/methods/beforeModel?anchor=beforeModel)
hook gets executed before the data gets fetched from the model hook, and before the page is rendered.
See [the next section](../model-hook/) for an explanation of the model hook.

In our index route handler, we'll call the [`replaceWith`](https://www.emberjs.com/api/ember/release/classes/Route/methods/beforeModel?anchor=replaceWith) function.
The `replaceWith` function is similar to the route's [`transitionTo()`](https://www.emberjs.com/api/ember/release/classes/Route/methods/transitionTo?anchor=transitionTo) function,
the difference being that `replaceWith` will replace the current URL in the browser's history,
while `transitionTo` will add to the history.
Since we want our `rentals` route to serve as our home page, we will use the `replaceWith` function.

In our index route handler, we add the `replaceWith` invocation to `beforeModel`.
All we want to do when a user visits the root (`/`) URL is transition to
`/rentals`. To do this we will add code to our index route handler by
implementing a route lifecycle hook called `beforeModel`.
Route lifecycle hooks are special methods that are called automatically when a route renders or data changes.
Inside, we'll call the
[`replaceWith`](https://www.emberjs.com/api/ember/release/classes/Route/methods/beforeModel?anchor=replaceWith)
function:

```javascript {data-filename="app/routes/index.js" data-diff="+4,+5,+6"}
import Route from '@ember/routing/route';
Expand All @@ -246,6 +237,13 @@ export default Route.extend({
});
```

The `replaceWith` function is similar to the route's
[`transitionTo()`](https://www.emberjs.com/api/ember/release/classes/Route/methods/transitionTo?anchor=transitionTo)
function, the difference being that `replaceWith` will replace the current URL
in the browser's history, while `transitionTo` will add to the history. Since we
want our `rentals` route to serve as our home page, we will use the
`replaceWith` function.

Now visiting the root route at `/` will result in the `/rentals` URL loading.

## Adding a Banner with Navigation
Expand Down