Ruby on rails has_one至未提供“创建_子对象”方法吗？

我有以下型号：

class User < ActiveRecord::Base
  has_one :image_assignment, as: :imageable
  has_one :image, through: :image_assignment
end

class ImageAssignment < ActiveRecord::Base
  belongs_to :image
  belongs_to :imageable, polymorphic: true
end

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

u = User.new
u.create_image #=> undefined method `create_image'

class用户未定义的方法“create#u image”

没错。您需要首先构建/创建图像分配

u.create_image_assignment
u.image_assignment.create_image

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啊，好吧，这就是我最后要做的。非常感谢。