[rails] After option useful when you want to change the order of DB columns


When I added a new column to the table and checked it using Sequel Pro etc., I had the experience that the newly added column was displayed at the end and it was hard to see, so I tried to find out how to fix it.


Image from Gyazo

If you add a column without specifying anything, the newly added column (total_price, is_cancel) will be placed after updated_at as shown in this figure.

after option


class AddColumnToOrders < ActiveRecord::Migration[6.0]
  def change
    add_column :orders, :total_price, :integer, null: false, after: :user_id
    add_column :orders, :is_cancel, :boolean, null: false, default: 0, after: :total_price 

In this way, you can use the after option to specify which column you want the newly added column to follow!

Image from Gyazo I was able to place a new column next to the user_id column.


Control the order of columns added by rails migration

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