现在项目有个批量存储本地图片的需求，查询了 carrierwave 具有存储本地图片的功能，代码实现 v1

@images = Dir.glob("some/local/path/*.jpeg")
@images.each do |file|
  image=Image.new
  image.file = [Pathname.new(file).open];
  image.save
end

虽然功能能实现，但是每次都只能单条插入，很容易想到同时多条插入效率肯定更高点，想到了 buck_insert 这个 gem，然后代码实现 v2

@images = Dir.glob("some/local/path/*.jpeg")
Image.bulk_insert(set_size: 100) do |worker|
  @images.each do |file|
    worker.add({ file: Pathname.new(file).open })
  end
end

然后后台无情的甩出了 TypeError (can't quote File):的错误，具体错误的意思应该是不支持 File 这种类型

/home/ubuntu/.rvm/gems/ruby-2.4.0@rails5/gems/activerecord-5.1.2/lib/active_record/connection_adapters/abstract/quoting.rb
def _quote(value)
  case value
  when String, ActiveSupport::Multibyte::Chars
    "'#{quote_string(value.to_s)}'"
  when true       then quoted_true
  when false      then quoted_false
  when nil        then "NULL"
  # BigDecimals need to be put in a non-normalized form and quoted.
  when BigDecimal then value.to_s("F")
  when Numeric, ActiveSupport::Duration then value.to_s
  when Type::Binary::Data then quoted_binary(value)
  when Type::Time::Value then "'#{quoted_time(value)}'"
  when Date, Time then "'#{quoted_date(value)}'"
  when Symbol     then "'#{quote_string(value.to_s)}'"
  when Class      then "'#{value}'"
  else raise TypeError, "can't quote #{value.class.name}"
  end
end

请教一下各自有什么高效的批量存储本地图片到数据库方法，数据库使用的 pg