paperclip + gravatar

Question

我找到了这个教程（ http://www.coffeepowered.net/2009/02/15/graceful-degredation-using-gravatar-as-a-fallback-avatar-with-paperclip/ ）关于将gravatar作为默认图像实现到启用了纸夹的模型，但在实现时，请参见[：format，：png]的消息“未定义方法`匹配”：数组“。这篇文章有什么不对吗？

Answer 1

我已经更新了代码，以便您更容易理解和调试。

Paperclip.interpolates(:gravatar_url) do |attachment, style|
  size = nil
  # style should be :tiny, :small, or :regular
  # size_data is assumed to be "16x16#", "20x20#", or "25x25#", i.e., a string
  size_data = attachment.styles[style][:geometry]
  if size_data
    # get the width of the attachment in pixels
    if thumb_size = size_data.match(/\d+/).to_a.first
      size = thumb_size.to_i
    end
  end
  # obtain the url from the model
  # replace nil with "identicon", "monsterid", or "wavatar" as desired
  # personally I would reorder the parameters so that size is first
  # and default is second
  attachment.instance.gravatar_url(nil, size)
end

Answer 2

注意尝试此解决方案时出现以下错误：

NoMethodError: undefined method `first' for #<Hash:0xb6476178>
    from /home/bob/dev/Firehoze/app/models/user.rb:114:in `gravatar_url'

我通过更换行来解决它：

size_data = attachment.styles[style].first

与

size_data = attachment.styles[style][:geometry]

Answer 3

Paperclip.interpolates :gravatar_url do |attachment, style|
    attachment.instance.gravatar_url(attachment.styles[style][:geometry].split('x').first)
end

Answer 4

如果您仍然遇到问题，可以尝试 Avatar gem，它支持链条不同的头像方法，包括Paperclip和Gravatar。

注意：这是一个无耻的插件，因为我写了这个东西。