ruby-on-rails - 回形针+头像

Question

我发现本教程（http://www.coffeepowered.net/2009/02/15/graceful-degredation-using-gravatar-as-a-fallback-avatar-with-paperclip/）关于将 gravatar 实现为默认图像到启用回形针的模型，但在实现时我看到消息“未定义的方法 `match' for [:format, :png]:Array”。这篇文章有什么问题？

Answer 1

我更新了代码，让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

请注意，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'

我通过替换线解决了它：

size_data = attachment.styles[style].first

和

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，您可以尝试Avatar gem，它支持一系列不同的 Avatar 方法，包括 Paperclip 和 Gravatar。

注意：这是一个有点无耻的插件，因为我写了这个东西。