不支持的字段数据类型:元数据

Question

我有此错误消息：

Unsupported field datatype: metadata.
Extracted source (around line #23):
21      end
22
23  configure :block, :metadata
24      
25  configure :sticky, :metadata do
26      view_helper :check_box

我正在做这个关于宝石rails_admin的演讲。在幻灯片 29 中，我把它放在帖子中，然后有这个错误。我的文件：

/

lib/rails_admin/metadata.rb

require 'rails_admin/config/fields/base'
module RailsAdmin
    class Metadata < RailsAdmin::Config::Fields::base
        RailsAdmin::Config::Fields::Types::register(self)
        def value
            raise 'No metadata!' unless bindings[:object].respond_to?(:metadata)
            bindings[:object].metadata[method_name]
        end
        def allowed_methods
            'metadata'
        end
        def parse_input(params)
            params['metadata'] ||= bindings[:object].metadata
            params['metadata'] [method_name] = params.delete(method_name)
        end
    end
end

/

models/blog/post.rb

class Blog::Post < ActiveRecord::Base
    has_many :comments
    belongs_to :user
    accepts_nested_attributes_for :comments
    serialize :metadata, Hash
    rails_admin do 
        configure :user do
            visible do
                bindings[:controller].current_ability.can? :edit, User
            end
        end
        configure :comments do
            visible do
                bindings[:controller].current_ability.can? :edit, Blog::comment
            end
        end
        configure :block, :metadata
        configure :sticky, :metadata do
            view_helper :check_box
        end
        configure :published, :metadata do
            view_helper :check_box
        end
        configure :priority, :metadata do
            view_helper :number_field
            defaul_value 0
        end
    end
end

Answer 1

您必须

require "#{Rails.root}/lib/rails_admin/metadata" rails_admin初始值设定项的头部。

或者在轨道自动加载路径中添加lib文件夹。

在您的config/application.rb中添加： config.autoload_paths = %W(#{config.root}/lib)

顺便说一句，rails_admin 中的序列化数据类型已经实现：https://github.com/sferik/rails_admin/blob/master/lib/rails_admin/config/fields/types/serialized.rb