Using PostgreSQL UUIDs as primary keys with Rails 5

Using PostgreSQL UUIDs as primary keys with Rails 5.

PostgreSQL has a native datatype for UUIDs and Rails 4.0+ has built-in support for using them as the primary key.

You can use UUIDs as the primary key on Rails 5 tables in a few simple steps.

Enable the extension.

Before using UUIDs in PostgreSQL, you must first enable the uuid-ossp extension.

If you’re already using UUIDs, you’ve already done this step. To enable the extension, generate a migration.

$ bin/rails g migration enable_uuid_extension

That should generate a migration that looks like this.

class EnableUuidExtension < ActiveRecord::Migration[5.0]
  def change
    enable_extension 'uuid-ossp'

Add ability to default to uuid as primary key when generating database migrations.

Put this in your config/application.rb file.

config.generators do |g|
  g.orm :active_record, primary_key_type: :uuid

Or create a new file at config/initializers/generators.rb. Best practices.

Rails.application.config.generators do |g|
  g.orm :active_record, primary_key_type: :uuid

Now, just use rails generate.

$ bin/rails g model User

Now, if you don’t want it as the default for all migrations. Does not ability default UUID.

You can use so for single migration.

bin/rails g model User --primary_key_type=uuid

Do you use UUID as your primary keys? Do you have anything to add? Leave your comment!

That’s all folks, until next time!!!

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