paperclip + gravatar

Question

我發現本教程（http://www.coffeepowered.net/2009/02/15/graceful-degredation-using-gravatar-as-a-fallback-avatar-with-paperclip/）關於將Gravatar作爲默認圖像實現爲啓用回形針的模型，但在實現時，我在[：format，：png]中看到消息「未定義方法匹配」：Array 」。這篇文章有什麼不對？

Answer 1

我更新了代碼，使其更容易理解和調試。

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

如果你仍然有問題，你可以試試Avatar寶石，它支持的不同化身的方法，包括回形針和的Gravatar鏈。

注意：這是一個無恥的插件，因爲我寫了這個東西。

Answer 3

注意我嘗試此解決方案時，出現以下錯誤：

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

我解決它通過更換行：

size_data = attachment.styles[style].first 

與

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

Answer 4

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