todomvc-elmfire

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todomvc-elmfire

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TodoMVC+Firebase in Elm+ElmFire

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// repository documentation

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# TodoMVC in Elm + ElmFire • [Demo](https://thomasweiser.github.io/todomvc-elmfire/)

[TodoMVC](http://todomvc.com/)
implemented in
[Elm](http://elm-lang.org/),
extending [Evan Czaplicki's](https://twitter.com/czaplic)
[version](https://github.com/evancz/elm-todomvc),
using [Firebase](https://www.firebase.com/)
via [ElmFire](https://github.com/ThomasWeiser/elmfire)
and [elmfire-extra](https://github.com/ThomasWeiser/elmfire-extra)
for storage and real-time collaboration.

## Build Instructions

This app needs the Elm plattform version 0.16. Compile with:

elm make --yes --output js/elm.js src/TodoMVC.elm
    
Then open `index.html` in your browser. The app should connect
to the shared Firebase and retrieve the current list of items.

Alternatively use the enclosed `Makefile` on Unix-like machines:

make all open
    
## Architectural Overview

The app complies with [The Elm Architecture](https://github.com/evancz/elm-architecture-tutorial/),
using [evancz/start-app](http://package.elm-lang.org/packages/evancz/start-app/2.0.0/)
and [evancz/elm-effects](http://package.elm-lang.org/packages/evancz/elm-effects/1.0.0).

A sketch of the data flow:

- Inputs are coming from
    - Firebase changes
    - user interaction
- The `model` comprises two parts
    - shared persistent state, mirrored from Firebase by means of `ElmFire.Dict`
    - local state (filter settings, intermediate edit state)
- An `update` function takes an input event and the current model, returning
  a new model and possibly an effect, i.e. a task to change the Firebase data (using `ElmFire.Op`).
- A `view` function renders the current model as HTML

Please note that content changes made by the user always flow through the Firebase layer.
From there they a passed down to the new model.
This utilizes the fact that the Firebase library immediately reflects local writes
without waiting for a server round trip.

Firebase queues up write operations during a network outage.
So the app will work offline and will catch up after going online again.

For adding new items the app uses Firebase's
[*push* operation](https://www.firebase.com/docs/web/api/firebase/push.html),
which generates chronologically sorted unique ids.
The model uses a dictionary
to map these ids to the items' payload.

## Future Work

- Explore architectural variations
    - Componentize the model: split it into a shared part and a local part
      where the local part depends on the shared part but not the other way round.
- Possibly structure the code into components, as outlined in [The Elm Architecture](https://github.com/evancz/elm-architecture-tutorial/).

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