用於更改現有數據庫視圖的Rails遷移

Question

我有一個名爲my_view的視圖，它是使用以下遷移創建的。

class CreateMyView < ActiveRecord::Migration 
    def change 
    execute <<-SQL 
     drop view if exists my_view 
    SQL 

    execute <<-SQL 
     CREATE OR REPLACE VIEW my_view AS 
     SELECT 
     t1.wfs_id, 
     t1.step_id, 
     t1.status, 
     t1.applied_by, 
     t2.created_at, 
     t2.is_wfs_end, 
     t2.app_status AS flowstep 
     FROM table1 t1 
     JOIN table2 t2 ON t1.wfs_id = t2.wfs_id 
     WHERE t1.del_flag = false; 
    SQL 
    end 
end 

現在我需要另一個領域，說my_new_field從table1在my_view可用。但我不知道如何爲此寫入遷移。任何幫助非常感謝。由於

Answer 1

什麼簡單地重新創建視圖：

class ChangeMyView < ActiveRecord::Migration 
    def change 
    execute <<-SQL 
     drop view if exists my_view 
    SQL 

    execute <<-SQL 
     CREATE OR REPLACE VIEW my_view AS 
     SELECT 
     t1.wfs_id, 
     t1.step_id, 
     t1.status, 
     t1.applied_by, 
     t1.my_new_field, 
     t2.created_at, 
     t2.is_wfs_end, 
     t2.app_status AS flowstep 
     FROM table1 t1 
     JOIN table2 t2 ON t1.wfs_id = t2.wfs_id 
     WHERE t1.del_flag = false; 
    SQL 
    end 

end