我使用以下内容:
has_attached_file :file,:styles => { :thumbnail => '320x240!'},:url => "/images/:attachment/:id/:style/:basename.:extension",:path => ":rails_root/public/images/:attachment/:id/:style/:basename.:extension"
validates_attachment_content_type :file, :content_type => [ 'image/gif', 'image/png', 'image/x-png', 'image/jpeg', 'image/pjpeg', 'image/jpg' ]
上传图片和视频.如果我使用:style =>{}那么图像不上传.我想:style只在文件的内容类型是图像时才使用方法.