class MeducationSDK::Recommender

Attributes

items[R]

Public Class Methods

new(items, options = {}) click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 14
def initialize(items, options = {})
  @items = [items].flatten
  @options = options
  @limit = options[:limit] || 5
end
recommend(items, options = {}) click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 5
def self.recommend(items, options = {})
  if items.is_a?(User)
    UserRecommender.new(items, options).recommend
  else
    new(items, options).recommend
  end
end

Public Instance Methods

config() click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 87
def config
  MeducationSDK.config
end
generate_recommendations() click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 36
def generate_recommendations
  groupings = {}
  correct_order = recommender_results.map do |result|
    groupings[result['type']] ||= []
    groupings[result['type']] << result['id']
    "#{result['type']}##{result['id']}"
  end

  output = groupings.map {|(type, ids)| sdk_class_for(type).where(id: ids) }.flatten
  output.sort_by!{ |item| correct_order.index("#{item.class.name}##{item.id}") }
  output
end
log(*args) click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 79
def log(*args)
  config.logger.info(*args)
end
log_error(*args) click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 83
def log_error(*args)
  config.logger.error(*args)
end
recommend() click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 20
def recommend
  recommendations = generate_recommendations
  if recommendations.size < @limit
    log "recommendations.size (#{recommendations.size}) is < limit of #{@limit}"
    recommendations += MeducationSDK::MediaFile.where('rating > 2').where(safe_for_email: true).per(@limit - recommendations.size).order(:random).to_a
  else
    log "recommendations.size (#{recommendations.size}) is >= limit of #{@limit}"
  end
  recommendations
rescue => e
  log_error("!!Recommender Error!!")
  log_error(e.message)
  log_error(e.backtrace)
  MeducationSDK::MediaFile.where('rating > 2').where(safe_for_email: true).per(@limit).order(:random).to_a
end
recommender_json() click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 60
def recommender_json
  path = "/combined"
  separator = "?"
  @items.each do |item|
    item_type, item_id = if item.is_a?(BoardItem)
      [item.item_type, item.item_id]
    else
      [item.class.name, item.id]
    end
    path << separator << "#{spi_type_for(item_type)}/#{item_id}"
    separator = "&"
  end
  log "Calling #{config.recommender_host}:#{config.recommender_host}#{path}"
  response = Net::HTTP.get_response(config.recommender_host, path, config.recommender_port)
  body = response.body
  log "Received #{body}"
  body
end
recommender_results() click to toggle source
# File lib/meducation_sdk/services/recommender.rb, line 49
def recommender_results
  @recommender_results ||= begin
    results = JSON.parse(recommender_json)
    if @options[:limit]
      results[0..(@options[:limit] - 1)]
    else
      results
    end
  end
end