Exec: rails generate migration add_note_to_dojos note:string (w/ default + nil guard)

Author: yasulab

db/migrate/20240618025325_add_note_to_dojos.rb

@@ -0,0 +1,5 @@
+class AddNoteToDojos < ActiveRecord::Migration[6.1]
+  def change
+    add_column :dojos, :note, :string, null: false, default: ""
+  end
+end