ruby-on-rails - Carrierwave:在第二个模型中复制文件

Question

我有两个模型，每个模型都有自己的 Carrierwave 上传器:

class User < ActiveRecord::Base
  mount_uploader :avatar, AvatarUploader
end

和:

class Bookshelf < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

我希望用户的头像是他上传的最新书架图片。我尝试像这样实现这一目标:

class BookcasesController < ApplicationController
  def create
    @bookcase = current_user.bookcases.build(params[:bookcase])
    if @bookcase.save
      current_user.avatar = @bookcase.image
      current_user.avatar.recreate_versions!
    end
  end
end

不幸的是，这对头像根本没有影响。我还能如何实现这一目标？

Answer 1

current_user.avatar = @bookcase.image
current_user.avatar.recreate_versions!

实际上并没有保存 --- 你可以:

current_user.avatar.save

或者如你所说:

current_user.update_attribute(:avatar, @bookcase.image)