stadtratmonitor/app/models/paper.rb

require 'elasticsearch/model'
require 'json'

class Paper < ActiveRecord::Base
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  validates_presence_of :body, :content, :name, :originator, :paper_type, :published_at, :reference, :url
  validates :url, uniqueness: true

  class << self
    def import_from_json(json_string)
      old_count = count
      JSON.parse(json_string).each do |record|
        attributes = {
          body: record['body'],
          content: record['content'],
          name: record['name'],
          resolution: record['resolution'],
          originator: record['originator'],
          paper_type: record['paper_type'],
          published_at: record['published_at'],
          reference: record['reference'],
          url: record['url'],
        }
        record = find_or_initialize_by(url: attributes[:url])
        record.update_attributes(attributes)
      end
      puts "Imported #{count - old_count} Papers!"
    end
  end
end