coalesce

KO | EN

gitlite — search

#hacktoberfest #typescript #android #linux #java #nodejs #windows #cli #kubernetes #vue #pytorch #security #ios #openai

(★ 32)

A modern client-side persistence framework

coalesce 최신버젼 다운로드

최종 버전 다운로드 (.zip)

// repository documentation

Was this content helpful?

★ 0 (0 ratings)

# Coalesce

[![Build Status](https://travis-ci.org/coalescejs/coalesce.png)](https://travis-ci.org/coalescejs/coalesce)

Coalesce.js is a robust and stable framework for syncing client state with a persistent backend such as a REST API or socket connection. Defining characteristics of coalesce include:

* Correctness is paramount. All other features, including performance, are important, but secondary.
* Built around synchronization. Models are never locked and framework semantics assume updates are always coming in from a backend.
* Full support for relationships. Related models can be saved concurrently and the framework will automatically order requests around foreign key dependencies.
* Robust handling of conflicts and errors.
* Forking models is first-class within the framework.
* All operations are structured around javascript promises.

Coalesce is a functional alternative to [ember-data](https://github.com/emberjs/data) and is used in production at [Outreach](https://www.outreach.io) with dozens of inter-related models.

## Installation

For now, as coalesce is in development, follow the development instructions to use coalesce. The `build-browser` command will create browser-compatible distributables in the `dist` folder. Include `coalesce.js` in the page after `ember.js`.

## Getting Started

### Your backend

By default, coalesce assumes that the backend is a REST api which sticks to pretty much the same conventions as ember-data's RESTAdapter needs. There are a few differences however:

* EPF sets a `client_id` in the JSON for every model and expects this to be echoed back by the server. It uses this to keep it's internal idmap up to date.
* Related keys still need to use _id and _ids (this is different from ember-data 1.0 beta 2)

### Defining Models

All models within coalesce are subclasses of `Ep.Model`. For example:

```
App.Post = Ep.Model.extend({
  title: Ep.attr('string'),
  body: Ep.attr('string'),

comments: Ep.hasMany(App.Comment),
  user: Ep.belongsTo(App.User)
});
```

### Loading Data

The primary means of interacting with `coalesce` is through a `session`. Coalesce automatically injects a primary session into all routes and controllers. To load data, you can use the `load` method on the session:

```
App.PostRoute = Ember.Route.extend({

model: function(params) {
    return this.session.load('post', params.post_id);
  }

});
```

For compatibility with the behavior of the Ember.js router, a `find` method is also placed on models. The above code is equivalent to:

```
App.PostRoute = Ember.Route.extend({

model: function(params) {
    return App.Post.find(params.post_id);
  }

});
```

The `find` method is the only method that is available on the models themselves and it is recommended to go through the session directly.

By default, Ember.js will automatically call the `find` method, so the above route can actually be simplified to:

```
App.PostRoute = Ember.Route.extend({
  // no model method required, Ember.js will automatically call `find` on `App.Post`
});
```

The session object also has other methods for finding data such as `query`.

### Mutating Models

To mutate models, simply modify their properties:

```
post.title = 'updated title';
```

To persist changes to the backend, simply call the `flush` method on the session object.

```
post.title = 'updated title';
session.flush();
```

In coalesce, most things are promises. In the above example you could listen for when the flush has completed using the promise API:

```
post.title = 'updated title';
session.flush().then(function(models) {
  // this will be reached if the flush is successful
}, function(models) {
  // this will be reached only if there are errors
});
```

### Handling Errors

Sessions can be flushed at any point (even if other flushes are pending) and re-trying errors is as simple as performing another flush:

```
post.title = 'updated title';
session.flush().then(null, function() {
  // the reject promise callback will be invoked on error
});

// do something here that should correct the error (e.g. fix validations)

session.flush(); // flush again
```

Models also have an `errors` property which will be populated when the backend returns errors.

### Transactional Semantics and Forked Records

Changes can be isolated easily using child sessions:

```
var post = session.load(App.Post, 1);

var childSession = session.newSession(); // this creates a "child" session

var childPost = childSession.load(App.Post, 1); // this record instance is separate from its corresponding instance in the parent session

post === childPost; // returns false, they are separate instances
post.isEqual(childPost); // this will return true

childPost.title = 'something'; // this will not affect `post`

childSession.flush(); // this will flush changes both to the backend and the parent session, at this point `post` will have its title updated to reflect `childPost`
```

## Development

To build coalesce, follow the instructions below:

* Install [node](http://nodejs.org/).
* `git clone https://github.com/coalescejs/coalesce`
* `cd coalesce`
* `npm install`
* `npm test` to run the tests via `mocha`
* To build a browser distributable, run the `build-browser` command in the repository root with `ember-script build-browser` (make sure to install [ember-script](https://github.com/ghempton/ember-script) globally).

## Discussion list

You can [join the email discussion
group](https://groups.google.com/forum/#!forum/ember-persistence-foundation) to get
help, as well as discuss new features and directions for Coalesce.  Please post any questions,
interesting things you discover or links to useful sites for Coalesce users.

coalesce

coalesce 최신버젼 다운로드

오늘의 추천 프로젝트

Was this content helpful?

Recent Feedback

coalesce

coalesce 최신버젼 다운로드

오늘의 추천 프로젝트

Was this content helpful?

Recent Feedback

Download README