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| -rw-r--r-- | guides/source/active_record_postgresql.md | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md index dcc523eb0f..fe112a4708 100644 --- a/guides/source/active_record_postgresql.md +++ b/guides/source/active_record_postgresql.md @@ -266,13 +266,14 @@ revision = Revision.first revision.identifier # => "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11" ``` -You can use `uuid` type to define references in migrations +You can use `uuid` type to define references in migrations: ```ruby # db/migrate/20150418012400_create_blog.rb -create_table :posts, id: :uuid +enable_extension 'pgcrypto' unless extension_enabled?('pgcrypto') +create_table :posts, id: :uuid, default: 'gen_random_uuid()' -create_table :comments, id: :uuid do |t| +create_table :comments, id: :uuid, default: 'gen_random_uuid()' do |t| # t.belongs_to :post, type: :uuid t.references :post, type: :uuid end @@ -288,6 +289,8 @@ class Comment < ActiveRecord::Base end ``` +See [this section](#uuid-primary-keys) for more details on using UUIDs as primary key. + ### Bit String Types * [type definition](http://www.postgresql.org/docs/current/static/datatype-bit.html) @@ -377,6 +380,9 @@ device = Device.create device.id # => "814865cd-5a1d-4771-9306-4268f188fe9e" ``` +NOTE: `uuid_generate_v4()` (from `uuid-ossp`) is assumed if no `:default` option was +passed to `create_table`. + Full Text Search ---------------- |