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+- Start Date: 2019-08-05
+- Relevant Team(s): Ember.js, Learning
+- RFC PR: https://github.com/emberjs/rfcs/pull/523
+- Tracking: (leave this empty)
+
+# Provide `@model` named argument to route templates
+
+## Summary
+
+Allow route templates to access the route's model with `@model` in addition to
+`this.model`.
+
+Before:
+
+```hbs
+{{!-- The model for this route is the current user --}}
+
+<div>
+  Hi <img src="{{this.model.profileImage}}" alt="{{this.model.name}}'s profile picture"> {{this.model.name}},
+  this is a valid Ember template!
+</div>
+
+{{#if this.model.isAdmin}}
+  <div>Remember, with great power comes great responsibility!</div>
+{{/if}}
+```
+
+After:
+
+```hbs
+{{!-- The model for this route is the current user --}}
+
+<div>
+  Hi <img src="{{@model.profileImage}}" alt="{{@model.name}}'s profile picture"> {{@model.name}},
+  this is a valid Ember template!
+</div>
+
+{{#if @model.isAdmin}}
+  <div>Remember, with great power comes great responsibility!</div>
+{{/if}}
+```
+
+## Motivation
+
+With the Octane release, templates are taking on a more important role in
+idomatic Ember apps. As template become more self-sufficient, many cases where
+a JavaScript class was needed in the past (e.g. to customize the "wrapper"
+element) can now be expressed with templates alone. This is a direction we will
+continue post-Octane.
+
+We would like to update the learning materials (guides) to focus on teaching
+the template-centric component model. For example, components can be introduced
+as a way to break up large templates into smaller, named pieces, similar to
+refactoring a big function into smaller ones. Then, we can layer on making them
+reusable through passing arguments. Next, we can introduce the idea of passing
+a block and yielding. Finally, we can introduce the component class when we are
+ready to discuss adding behavior to the component.
+
+As you can see, we can accomplish quite a lot with templates-only components in
+Octane, and focusing on the teaching template first-and-foremost would provide
+a gentle learning curve for developers and designers who are comfortable with
+HTML but perhaps new to Ember (or even JavaScript). With this flow, the concept
+of a component class, and consequently, the idea of a "`this` context" in a
+template comes up quite late.
+
+This presents a problem, as we may want or need to teach route templates before
+that was introduced. As the model can only be accessed through `this.model` in
+a route template, we would be forced to introduce that concept (and the contept
+of a controller) at an earlier time than would be ideal.
+
+Providing `@model` to route templates would solve this problem quite elegantly.
+We will now be able to introduce the concept of arguments (`@name`) once and it
+can be applied consistently between component and route templates.
+
+This also aligns with the general mental model that arguments are things that
+are passed into the template from the outside (which is true in the case of the
+route model).
+
+This can also be thought of as a small incremental step in the bigger picture
+of reforming route templates and removing controllers from Ember. Specifically,
+it moves us a bit closer to the mental model that controllers/route templates
+are just a "special" kind of component. We expect to continually unify them and
+remove the remaining differences, and this is a step towards that direction.
+
+## Detailed design
+
+Internally, route templates are _already_ modelled as components at the Glimmer
+VM layer. To implement this, we would "synthesize" a named argument `@model`
+containing the resolved route model, i.e. the same value as `this.model` on the
+controller instance.
+
+Just like the "reflected" named arguments in classic components, mutating
+`this.model` on the controller instance would _not_ change the value of
+`@model`. In practice, this seems unlikely to be relied upon and probably
+considered a bad practice (it does not change the URL, does not affect what is
+returned by `route.modelFor`, etc). In any case, this is consistent with the
+general behavior for named arguments, in that they are immutable and should
+always reflect what was "passed in" from the caller.
+
+## How we teach this
+
+* `@model` is passed into the component from the route
+* `this.model` is how you access the same thing from the controller, if needed
+* Guides and API docs should be updated to use `@model` instead of `this.model`
+
+## Drawbacks
+
+None?
+
+## Alternatives
+
+We can do nothing.
+
+## Unresolved questions
+
+None?