posts_controller.rb

class PostsController < ApplicationController

  def create
    post = Post.new(post_params)
    # Get all devices stored on your database
    # or filter based on your criteria
    devices = Device.all
    notifications = devices.map do |d|
      APNS::Notification.new(d.token,
      alert: post.title,
      other: 'Here, you can pass custom info to your app')
    end
    APNS.send_notifications(notifications) if !notifications.empty?
  end

  protected
    def post_params
      params.require(:post).permit(:title, :content)
    end
end