fohow_admin/app/models/product_attr_config.rb

class ProductAttrConfig < ActiveRecord::Base
    has_paper_trail
    self.table_name = 'product_attr_configs'
    belongs_to :product_attr_key, :foreign_key => :attr_key_id
    validates :size_type,presence:true


    def show_products
        showProducts=[[]]
        @products = Product.where("show_flag=1").order("created_at desc")
        @products.each do |pd|
            a=[pd.id,pd.name]
            showProducts.push(a)
        end
        showProducts.each {|v| puts v}
        return showProducts
    end

    rails_admin do
        navigation_label '商品管理'
        weight -250
        parent ProductAttrKey
        nestable_tree({
            position_field: :position,
            max_depth: 2
        })

        list do 
            filters [:product_id,:product_attr_key]
            field :id
            field :product_id
            field :show_products
            field :product_attr_key
            field :size_type
        end

        show do
            field :id
            field :product_id
            field :product_attr_key
            field :size_type
        end

        edit do
            field :product_id
            field :product_attr_key
            field :size_type
        end
    end

end