index.rb

require 'pp'
require 'active_record'
require 'kaminari'
require 'graphiti'
require './seeds'

class ApplicationResource < Graphiti::Resource
  self.abstract_class = true
  self.adapter = Graphiti::Adapters::ActiveRecord
  self.autolink = false
end

class EmployeeResource < ApplicationResource
  attribute :first_name, :string
  attribute :last_name, :string
  attribute :age, :integer

  has_many :positions
end

class PositionResource < ApplicationResource
  attribute :employee_id, :integer, only: [:filterable]
  attribute :department_id, :integer, only: [:filterable]
  attribute :title, :string

  belongs_to :department
end

class DepartmentResource < ApplicationResource
  attribute :name, :string
end

Graphiti.setup!

employees = EmployeeResource.all({
  sort: '-id',
  filter: { age: { gt: 30 } },
  page: { size: 10, number: 1 },
  include: 'positions.department'
})

employees.each do |e|
  puts "#{e.first_name} | #{e.positions[0].title} | #{e.positions[0].department.name}"
end

pp JSON.parse(employees.to_jsonapi)
puts "\n\n"
pp JSON.parse(employees.to_json)
puts "\n\n"
puts employees.to_xml