mongoid - 无法将 ActionDispatch::Http::UploadedFile 类的对象序列化为 BSON

Question

我正在关注GridFS with Mongoid and CarrierWave实现一个简单的 has_many 多态关系，当我尝试通过嵌套属性分配创建一个带有头像的新用户时，我得到:

Cannot serialize an object of class ActionDispatch::Http::UploadedFile into BSON

还有人遇到过这种情况吗？我注意到一些人发布了对“GridFS with Mongoid and CarrierWave”文章的回复，但我找不到任何人提供答案。

# app/models/asset.rb
class Asset
    include Mongoid::Document
    include Mongoid::Timestamps

    mount_uploader :file, AssetUploader

    field :name, type: String

    referenced_in :attachable, polymorphic: true
end

# app/models/user.rb
class User
    include Mongoid::Document
    include Mongoid::Timestamps

    references_one :avatar, as: :attachable

    accepts_nested_attributes :avatar
end

# config/initializers/carrierwave.rb
CarrierWave.configure do |config|
    config.grid_fs_connection = Mongoid.database
    config.storage = :grid_fs
    config.grid_fs_access_url = "/images"
end

# app/uploaders/asset_uploader.rb
class AssetUploader < CarrierWave::Uploader::Base  
end

# app/views/users/new.html.haml
= semantic_form_for(@user, html: { multipart: true }) do |f|
    = f.inputs do
    = f.semantic_fields_for :avatar do |af|
        = af.input :file, as: :file
    = f.buttons do
        = f.commit_button "Upload"

Answer 1

这都是关于命名字段的。

对 mongo_mapper 和我在表单上重命名的字段也有同样的问题。

表单字段必须与模型中的字段具有相同的名称。