Question

我正在尝试实现一个结构：GrandFather＆lt; - Father＆lt; - Son 使用rails和gem citier。这个例子应该创建2个表来表示3个类：一个用于Root类（GrandFather）和它的属性，另一个用于表示父类和Son类（因为Son没有其他属性）和Father的属性。

class GrandFather < ActiveRecord::Base
    acts_as_citier
    attr_accessible :grand_father_attr, :type
end

class Father < GrandFather
    acts_as_citier
    attr_accessible :father_attr
end

class Son < Father

end

class CreateGrandFathers < ActiveRecord::Migration
    def change
        create_table :grand_fathers do |t|
            t.string :type
            t.string :grand_father_attr
            t.timestamps
        end
    end
end

class CreateFathers < ActiveRecord::Migration
    def up
        create_table :fathers do |t|
            t.string :father_attr
        end
        create_citier_view(Father)
    end

    def down
        drop_citier_view(Father)
        drop_table :fathers
    end
end

但是如果我打开rails console并输入'Son.new'，那么GrandFather中的属性就在那里，但是来自Father类的属性丢失了：

1.9.3-p362 :001 > Son.new
citier -> Root Class
citier -> table_name -> grand_fathers
citier -> Non Root Class
citier -> table_name -> fathers
citier -> tablename (view) -> view_fathers
   (1.1ms)   SELECT COUNT(*)
 FROM pg_tables
 WHERE tablename = 'grand_fathers'


   (0.5ms)   SELECT COUNT(*)
 FROM pg_views
 WHERE viewname = 'grand_fathers'

 => #<Son id: nil, type: "Son", grand_father_attr: nil, created_at: nil, updated_at: nil>

Answer 1

我最终得到了一个非常简单的解决方法，在我的示例中，唯一的修改是：

class Son < Father 
   acts_as_citier :table_name => 'fathers'
end

Rails - Citier - 两级继承，Child Class不继承Middle Class属性

1 个答案: