Rails 4. Migrate table id to UUID

Question

I have a table: db/migrate/20140731201801_create_voc_brands.rb:

class CreateVocBrands < ActiveRecord::Migration
  def change
    create_table :vo         


        

Answer 1

I had the same problem as yours. To migrate from default id to use uuid, I think you could something similar to what I had:

class ChangeVocBrandsPrimaryKey < ActiveRecord::Migration
  def change
    add_column :voc_brands, :uuid, :uuid, default: "uuid_generate_v4()", null: false

    change_table :voc_brands do |t|
      t.remove :id
      t.rename :uuid, :id
    end
    execute "ALTER TABLE voc_brands ADD PRIMARY KEY (id);"
  end
end