Rails遗留数据库连接，手动定义列

Question

所以我可以使用以下代码进行连接，但表中有大约200列。我只对2或3感兴趣（例如id，name，location）。

如何手动将这些定义为模型的有效列？

class Legacy < ActiveRecord::Base

establish_connection({
   :adapter     => "postgresql",
   :host          => "localhost",
   :username => "myUser",
   :password => "myPass",
   :database => "legacy_db"
 })

self.table_name = 'account'

end

Answer 1

在这里回答：Restrict the columns represented in ActiveRecord

class MyModel < ActiveRecord::Base
  default_scope select("column1, column2, column3")

  ...
end