simple api pagination

Gemfile

gem 'jbuilder', '~> 2.5'
gem 'kaminari'

index.json.jbuilder

json.topics @topics do |topic|
  json.id topic.id
  json.body topic.body
end
if @topics.next_page
  json.next_href api_board_topics_url(page: @topics.next_page)
end

result.json

{
  "topics": [

  ],
  "next_href": "http://localhost:3000/api/boards/renner/topics?page=2"
  }
}

topics_controller.rb

def index
  @topics = @board.topics.latest.page(params[:page]).per(20)
end