Question

class CashOrderStatus < ActiveRecord::Base
  belongs_to:cash_order
end

usually the db need a table cash_order_statuses to mapping this model,but now i want to

mapping this model to a specific sql view like

select * from order_statues where cash_order_id is not null <=> CashOrderStatus 

does rails provide some way to achieve this

Answer 1

There are multiple ways to fulfill your requirement:

1. In your CashOrderStatus model, you can set table name to override default ORM mapping:

class CashOrderStatus > ActiveRecord::Base
  set_table_name "order_statuses"

  belongs_to:cash_order
end

1. You can implement STI(Single Table Inheritance) functionality where in your database table “order_statuses” one more column will be there: type which will hold the derived model class name(In this case, CashOrderStatus).

So your model will look like this:

class CashOrderStatus > OrderStatus
  set_table_name "order_statuses"

  belongs_to:cash_order
end

And OrderStaus model will be derived from AR::Base class. Try it.

NOTE: Sorry for the class inheritance notation. It should be < instead of >. There is formatting issue in my stackoverflow account, so I put like this 🙂