Question

我想使用ActiveRecord来处理我的表数据，但是如果我的表名是可变的，那该怎么办呢。此代码将生成错误。有什么建议吗？

name = "Posts"

class name < ActiveRecord::Base
end

Answer 1

我相信你可以做以下事情：

name = 'Post' # Dynamically generate the class name
klass = Class.new(ActiveRecord::Base) do
          # This is the base class.
          # You can pass a block with new
          # methods here if you'd like.
        end
Object.const_set name, klass
name.constantize.new # Call your class dynamically :)

Answer 2

您可以执行以下操作，从变量中设置table_name：

class Post < ActiveRecord::Base
  def self.table_name
    # Some method to determine and set the table name.
    # Must return a string with a table name. E.g. the 
    # following would set the table name to `posts_2015-11-15`

    "posts_#{Date.today}"
  end

  # ...
end

ActiveRecord类名为var

2 个答案: