Rails迁移以更改现有数据库视图

Question

我有一个my_view使用以下迁移创建的命名视图。

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

现在我需要另一个字段，例如my_new_fieldfrom table1可以在中使用my_view。但是我不知道如何为此编写迁移。任何帮助，不胜感激。谢谢

Answer 1

简单地重新创建视图呢：

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