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# Fast JSON API

[![NetflixOSS Lifecycle](img.shields.io/osslifecycle/Netflix/osstracker.svg)]()

A lightning fast [JSON:API](jsonapi.org/) serializer for Ruby Objects.

# Performance Comparision

We compare serialization times with Active Model Serializer as part of RSpec performance tests included on this library. We want to ensure that with every change on this library, serialization time is at least ‘25 times` faster than Active Model Serializers on up to current benchmark of 1000 records.

## Benchmark times for 250 records

“‘bash

$ rspec
Active Model Serializer serialized 250 records in 138.71 ms
Fast JSON API serialized 250 records in 3.01 ms

“‘

# Table of Contents

  • [Features](#features)

  • [Installation](#installation)

  • [Usage](#usage)

    • [Model Definition](#model-definition)

    • [Serializer Definition](#serializer-definition)

    • [Object Serialization](#object-serialization)

    • [Compound Document](#compound-document)

    • [Collection Serialization](#collection-serialization)

    • [Caching](#caching)

  • [Contributing](#contributing)

## Features

  • Declaration syntax similar to Active Model serializer

  • Support for belongs_to, has_many and has_one

  • Support for compound documents (included)

  • Optimized serialization of compound documents

  • Caching

## Installation

Add this line to your application’s Gemfile:

“‘ruby gem ’fast_jsonapi’ “‘

Execute:

“‘ruby $ bundle install “`

## Usage

### Model Definition

“‘ruby class Movie

attr_accessor :id, :name, :year, :actor_ids, :owner_id

end “‘

### Serializer Definition

“‘ruby class MovieSerializer

include FastJsonapi::ObjectSerializer
set_type :movie  # optional
attributes :name, :year
has_many :actors
belongs_to :owner, record_type: :user
belongs_to :movie_type

end “‘

### Sample Object

“‘ruby m = Movie.new m.id = 232 m.name = ’test movie’ m.actor_ids = [1, 2, 3] m.owner_id = 3 m.movie_type_id = 1 m “‘

### Object Serialization

#### Return a hash “‘ruby hash = MovieSerializer.new(movie).serializable_hash “`

#### Return Serialized JSON “‘ruby json_string = MovieSerializer.new(movie).serialized_json “`

#### Serialized Output

“‘json {

"data": {
  "id": "232",
  "type": "movie",
  "attributes": {
    "name": "test movie",
    "year": null
  },
  "relationships": {
    "actors": {
      "data": [
        {
          "id": "1",
          "type": "actor"
        },
        {
          "id": "2",
          "type": "actor"
        }
      ]
    },
    "owner": {
      "data": {
        "id": "3",
        "type": "user"
      }
    }
  }
}

}

“‘ ### Compound Document

Support for top-level included member through ‘ options `.

“‘ruby options = {} options = { total: 2 } options = [:actors] MovieSerializer.new([movie, movie], options).serialized_json “`

### Collection Serialization

“‘ruby options = { total: 2 } hash = MovieSerializer.new([movie, movie], options).serializable_hash json_string = MovieSerializer.new([movie, movie], options).serialized_json “`

### Caching

“‘ruby class MovieSerializer

include FastJsonapi::ObjectSerializer
set_type :movie  # optional
cache_options enabled: true cache_length: 12.hours
attributes :name, :year

end “‘

### Customizable Options

Option | Purpose | Example ———— | ————- | ————- set_type | Type name of Object | “‘set_type :movie “` cache_options | Hash to enable caching and set cache length | “`cache_options enabled: true cache_length: 12.hours“` id_method_name | Set custom method name to get ID of an object | “`has_many :locations, id_method_name: :place_ids “` object_method_name | Set custom method name to get related objects | “`has_many :locations, object_method_name: :places “` record_type | Set custom Object Type for a relationship | “`belongs_to :owner, record_type: :user“` serializer | Set custom Serializer for a relationship | “`has_many :actors, serializer: :custom_actor“` cache_options | Hash to enable caching and set cache length | “`cache_options enabled: true cache_length: 12.hours “`

## Contributing

This gem is built using a gem building gem called [juwelier](github.com/flajann2/juwelier).

Beyond just editing source code, you’ll be interacting with the gem using rake a lot. To see all the tasks available with a brief description, you can run:

“‘bash rake -T “`

### Updating Project information You can update the project information of the gem by updating the [Rakefile](Rakefile). Then you need to generate a new gemspec

“‘bash rake gemspec “`

### Running Tests We use rspec for testing. We have unit tests, functional tests and performance tests. To run tests use the following rake task

“‘bash rake spec “`

### Installation

“‘bash $ rake install “`

The install rake task builds the gem installs it. You’re all set if you’re using [RVM](rvm.beginrescueend.com/), but you may need to run it with sudo if you have a system-installed ruby:

### Bumping Version

It feels good to release code. Do it, do it often. But before that, bump the version. Then release it. There’s a few ways to update the version:

“‘ruby # version:write like before $ rake version:write MAJOR=0 MINOR=3 PATCH=0

# bump just major, ie 0.1.0 -> 1.0.0 $ rake version:bump:major

# bump just minor, ie 0.1.0 -> 0.2.0 $ rake version:bump:minor

# bump just patch, ie 0.1.0 -> 0.1.1 $ rake version:bump:patch “‘