Module: LightRecord::RelationMethods

Defined in:
lib/light_record.rb

Instance Method Summary collapse

Instance Method Details

#light_records(options = {}) ⇒ Object

Executes query and return array of light object (model class extended by LightRecord)



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# File 'lib/light_record.rb', line 193

def light_records(options = {})
  sql = self.to_sql

  options = {
    stream: false, symbolize_keys: true, cache_rows: false, as: :hash,
    database_timezone: ActiveRecord::Base.default_timezone
  }.merge(options)

  result = _light_record_execute_query(connection, sql, options.except(:set_const))

  klass = LightRecord.build_for_class(self.klass, result.fields)

  if options[:set_const]
    self.klass.const_set(:"LR_#{Time.now.to_i}", klass)
  end

  need_symbolize_keys = defined?(PG::Result) && result.is_a?(PG::Result)

  records = []
  result.each do |row|
    row.symbolize_keys! if need_symbolize_keys
    records << klass.new(row)
  end

  return records
end

#light_records_each(options = {}) ⇒ Object

Same as #light_records but iterates through result set and call block for each object this uses less memroy because it creates objects one-by-one it uses stream feature of mysql client



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# File 'lib/light_record.rb', line 223

def light_records_each(options = {})
  conn = ActiveRecord::Base.connection_pool.checkout
  sql = self.to_sql

  options = {
    stream: true, symbolize_keys: true, cache_rows: false, as: :hash,
    database_timezone: ActiveRecord::Base.default_timezone
  }.merge(options)

  result = _light_record_execute_query(conn, sql, options.except(:set_const))

  klass = LightRecord.build_for_class(self.klass, result.fields)

  if options[:set_const]
    self.klass.const_set(:"LR_#{Time.now.to_i}", klass)
  end

  if defined?(PG::Result) && result.is_a?(PG::Result)
    begin
      result.stream_each do |row|
        row.symbolize_keys!
        yield klass.new(row)
      end
    rescue => error
      conn.raw_connection.get_last_result
      throw error
    ensure
      result.clear
    end
  else
    result.each do |row|
      yield klass.new(row)
    end
  end
ensure
  ActiveRecord::Base.connection_pool.checkin(conn)
end