Good RoR Gravatar gem/plugin and detect if the gravatar account exists or not

I'm currently using mdeering's gravatar_image_tag plugin to get gravatar images for users but my dilemma is to try to detect in the code if the user has a gravatar:

If he does then display the gravatar image. If not, then display a local default image file on my server.

I'm open to using other p开发者_开发知识库lugins if they offer this functionality.

Please provide code examples. They help me learn the best.

Thanks!

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You don't need gems/plugins. This screencast explains what you need step-by-step. It comes down to using the following helper method:

def avatar_url(user)
  default_url = "#{root_url}images/guest.png"
  gravatar_id = Digest::MD5.hexdigest(user.email.downcase)
  "http://gravatar.com/avatar/#{gravatar_id}.png?s=48&d=#{CGI.escape(default_url)}"
end

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Here is a helper method to check if a user has already a gravatar image :

The trick is to get gravatar image with a false default image and then check header response. It's achieved with the Net::HTTP ruby library.

def gravatar?(user)
        gravatar_check = "http://gravatar.com/avatar/#{Digest::MD5.hexdigest(user.gravatar_email.downcase)}.png?d=404"
        uri = URI.parse(gravatar_check)
        http = Net::HTTP.new(uri.host, uri.port)
        request = Net::HTTP::Get.new(uri.request_uri)
        response = http.request(request)
        if (response.code.to_i == 404)
            return false
        else
            return true
        end 
    end

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Gravtastic gem should come to your rescue. Its fairly straightforward - you may peruse through its README. The Gem's github link

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Looks like I'm extremely late to the party but the gravatar_image_tag gems does have the options that you need to accomplish this very easily.

You can configure your default image globally in your application like so:

# config/initializers/gravatar_image_tag.rb
GravatarImageTag.configure do |config|   
  # Set this to use your own default gravatar image rather then serving up Gravatar's default image [ 'http://example.com/images/default_gravitar.jpg', :identicon, :monsterid, :wavatar, 404 ].
  config.default_image  = nil
end

Or on a one off basis like so:

gravatar_image_tag('junk', alt: 'Github Default Gravatar', gravatar: { default: 'https://assets.github.com/images/gravatars/gravatar-140.png' })