96 lines
3.2 KiB
Markdown
96 lines
3.2 KiB
Markdown
# Angel3 RethinkDB
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[](https://dart.dev/null-safety)
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[](https://discord.gg/3X6bxTUdCM)
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[](https://github.com/dart-backend/angel/tree/master/packages/mongo/LICENSE)
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This is RethinkDB service for Angel3 framework. RethinkDB is an open-source database for the realtime web.
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## Installation
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Add the following to your `pubspec.yaml`:
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```yaml
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dependencies:
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angel3_rethink: ^8.0.0
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```
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`belatuk-rethinkdb` driver will be used for connecting to RethinkDB.
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## Usage
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This library exposes one class: `RethinkService`. By default, these services will listen to [changefeeds](https://www.rethinkdb.com/docs/changefeeds/ruby/) from the database, which makes them very suitable for WebSocket use. However, only `CREATED`, `UPDATED` and `REMOVED` events will be fired. Technically not
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a problem, as it lowers the number of events that need to be handled on the client side.
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## Model
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`Model` is class with no real functionality; however, it represents a basic document, and your services should host inherited classes. Other Angel service providers host `Model` as well, so you will easily be able to modify your application if you ever switch databases.
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```dart
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class User extends Model {
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String username;
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String password;
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}
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main() async {
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var r = RethinkDb();
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var conn = await r.connect(
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db: 'testDB',
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host: "localhost",
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port: 28015,
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user: "admin",
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password: "");
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app.use('/api/users', RethinkService(conn, r.table('users')));
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// Add type de/serialization if you want
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app.use('/api/users', TypedService<User>(RethinkService(conn, r.table('users'))));
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// You don't have to even use a table...
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app.use('/api/pro_users', RethinkService(conn, r.table('users').filter({'membership': 'pro'})));
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app.service('api/users').afterCreated.listen((event) {
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print("New user: ${event.result}");
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});
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}
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```
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## RethinkService
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This class interacts with a `Query` (usually a table) and serializes data to and from Maps.
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## RethinkTypedService<T>
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Does the same as above, but serializes to and from a target class using `belatuk_json_serializer` and it supports reflection.
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## Querying
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You can query these services as follows:
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```curl
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/path/to/service?foo=bar
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```
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The above will query the database to find records where `foo` equals `bar`. The former will sort result in ascending order of creation, and so will the latter.
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You can use advanced queries:
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```dart
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// Pass an actual query...
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service.index({'query': r.table('foo').filter(...)});
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// Or, a function that creates a query from a table...
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service.index({'query': (table) => table.getAll('foo')});
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// Or, a Map, which will be transformed into a `filter` query:
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service.index({'query': {'foo': 'bar', 'baz': 'quux'}});
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```
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You can also apply sorting by adding a `reql` parameter on the server-side.
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```dart
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service.index({'reql': (query) => query.sort(...)});
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```
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See the tests for more usage examples.
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