Method: DynaModel::Query::ClassMethods#scan

Defined in:
lib/dyna_model/query.rb

#scan(options = {}) ⇒ Object

:count=>10, :scanned_count=>10, :last_evaluated_key=>“guid”=>{:s=>“11f82550-5c5d-11e3-9b55-d311a43114ca”}} :manual_batching => true|false

return results with last_evaluated_key instead of automatically looping through (useful to throttle or )



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# File 'lib/dyna_model/query.rb', line 127

def scan(options={})
  aggregated_results = []

  batch_size = options.delete(:batch) || DEFAULT_BATCH_SIZE
  max_results_limit = options[:limit]
  options[:limit] = batch_size

  results = self.dynamo_db_table.scan(options)
  response = Response.new(results)

  results[:member].each do |result|
    attrs = Response.strip_attr_types(result)
    aggregated_results << self.obj_from_attrs(attrs, options)
  end

  if response.more_results? && !options[:manual_batching]
    results_returned = response.count
    batch_iteration = 0
    Timeout::timeout(QUERY_TIMEOUT) do
      while response.more_results?
        if max_results_limit && (delta_results_limit = (max_results_limit-results_returned)) < batch_size
          break if delta_results_limit == 0
          options.merge!(limit: delta_results_limit)
        else
          options.merge!(limit: batch_size)
        end

        results = dynamo_table.scan(options.merge(exclusive_start_key: response.last_evaluated_key))
        response = Response.new(results)
        results[:member].each do |result|
          attrs = Response.strip_attr_types(result)
          aggregated_results << self.obj_from_attrs(attrs, options)
        end
        results_returned += response.count
        batch_iteration += 1
      end
    end
  end

  if options[:manual_batching]
    response_hash = {
      results: aggregated_results,
      last_evaluated_key: results[:last_evaluated_key]
    }
    response_hash.merge!(consumed_capacity: results[:consumed_capacity]) if results[:consumed_capacity]
    response_hash
  else
    aggregated_results
  end
end