当我使用回形针将我的语音模型添加以下验证时,正在努力锻炼,当我尝试上传mp3时会触发它：
- class Voice < ActiveRecord::Base
- has_attached_file :clip
- validates_attachment_presence :clip
- validates_attachment_content_type :clip,:content_type => [ 'application/mp3','application/x-mp3','audio/mpeg','audio/mp3' ],:message => 'file must be of filetype .mp3'
- validates_attachment_size :clip,:less_than => 10.megabytes
- validates_presence_of :title
- end