我有人模型:classPersonincludeMongoid::DocumentincludeMongoid::MultiParameterAttributesincludeMongoid::Paperclipattr_accessible:photo,:namehas_mongoid_attached_file:photo,:styles=>{:thumb=>"100x100>"},default_url:"/images/:style/missing.png"field:photofield:nameend在ManagedbController的更新操作中，我做了:defedit