Rails attachments inline are not shown correctly in gmail

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After all i found a solution: all you need to do is set the mime-type and encoding of the attachment.

attachments.inline['blank'] = {
                                :data => File.read("#{Rails.root.to_s + '/app/assets/images/blank_500x500.png'}"),
                                :mime_type => "image/png",
                                :encoding => "base64"
                              }
attachments.inline['discount-deal-triangle'] = {
                                :data => File.read("#{Rails.root.to_s + '/app/assets/images/discount-deal-triangle.png'}"),
                                :mime_type => "image/png",
                                :encoding => "base64"
                              }

That did the trick for me.

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