README.md
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# Apache PredictionIO Ruby SDK
[](https://github.com/apache/predictionio-sdk-ruby)
[](http://badge.fury.io/rb/predictionio)
The Ruby SDK provides a convenient wrapper for PredictionIO Event Server API and
Engine API. It allows you to quickly record your users' behavior and retrieve
personalized predictions for them.
## Documentation
Full Ruby SDK documentation can be found [here](http://www.rubydoc.info/github/apache/incubator-predictionio-sdk-ruby).
Please see the [PredictionIO App Integration
Overview](http://predictionio.apache.org/appintegration/) to
understand how the SDK can be used to integrate PredictionIO Event Server and
Engine with your application.
## Installation
Ruby 2+ required!
The module is published to [RubyGems](http://rubygems.org/gems/predictionio) and
can be installed directly by:
```sh
gem install predictionio
```
Or using [Bundler](http://bundler.io/) with:
```
gem 'predictionio', '0.12.1'
```
## Sending Events to Event Server
Please refer to [Event Server
documentation](http://predictionio.apache.org/datacollection/) for
event format and how the data can be collected from your app.
### Instantiate Event Client and connect to PredictionIO Event Server
```ruby
require 'predictionio'
# Define environment variables.
ENV['PIO_THREADS'] = '50' # For async requests.
ENV['PIO_EVENT_SERVER_URL'] = 'http://localhost:7070'
ENV['PIO_ACCESS_KEY'] = 'YOUR_ACCESS_KEY' # Find your access key with: `$ pio app list`.
# Create PredictionIO event client.
client = PredictionIO::EventClient.new(ENV['PIO_ACCESS_KEY'], ENV['PIO_EVENT_SERVER_URL'], Integer(ENV['PIO_THREADS']))
```
### Create a `$set` user event and send it to Event Server
```ruby
client.create_event(
'$set',
'user',
user_id
)
```
### Create a `$set` item event and send it to Event Server
```ruby
client.create_event(
'$set',
'item',
item_id,
{ 'properties' => { 'categories' => ['Category 1', 'Category 2'] } }
)
```
### Create a `$set` item event and send it to Event Server to specific channel
*NOTE:* channels are supported in PIO version >= 0.9.2 only. Channel must be created first.
```ruby
client.create_event(
'$set',
'item',
item_id,
{ 'properties' => { 'categories' => ['Category 1', 'Category 2'], 'channel' => 'test-channel'} }
)
```
### Create a user 'rate' item event and send it to Event Server
```ruby
client.create_event(
'rate',
'user',
user_id, {
'targetEntityType' => 'item',
'targetEntityId' => item_id,
'properties' => { 'rating' => 10 }
}
)
```
### Asynchronous request
To send an async request, simply use the `acreate_event` method instead of
`create_event`. Be aware that the asynchronous method does not throw errors.
It's best to use the synchronous method when first getting started.
## Query PredictionIO Engine
### Connect to the Engine:
```ruby
# Define environmental variables.
ENV['PIO_ENGINE_URL'] = 'http://localhost:8000'
# Create PredictionIO engine client.
client = PredictionIO::EngineClient.new(ENV['PIO_ENGINE_URL'])
```
### Send a prediction query to the engine and get the predicted result:
```ruby
# Get 5 recommendations for items similar to 10, 20, 30.
response = client.send_query(items: [10, 20, 30], num: 5)
```
## Mailing List
Please use the Apache mailing lists. Subscription instructions are
[here](http://predictionio.apache.org/support/).
## Issue Tracker
Use [the Apache JIRA](https://issues.apache.org/jira/browse/PIO), and file any
issues under the `Ruby SDK` component.
## Contributing
Please follow these
[instructions](http://predictionio.apache.org/community/contribute-code/).
## License
[Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0).