回形针+头像

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/)，它是关于将gravatar实现为启用回形针的模型的默认图像，但在实现时，我看到了消息"undefined method ` `match‘for :format，:png:Array“。这篇文章有什么问题吗？

Answer 1

我已经更新了代码，使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，我在尝试此解决方案时遇到以下错误：

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

我通过替换这行代码解决了这个问题：

size_data = attachment.styles[style].first

使用

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