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Merge pull request #19868 from createdbypete/guides-postgres-uuid-pgcrypto 

Provide mention of pgcrypto extension for Postgres UUID support

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This commit is contained in:
Yves Senn 2015-05-05 09:18:23 +02:00
parent d687881fa8 54becc9561
commit a7e2ae3594
1 changed files with 9 additions and 6 deletions
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15
guides/source/active_record_postgresql.md
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@ -242,10 +242,12 @@ article.save!
### UUID
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-uuid.html)
* [generator functions](http://www.postgresql.org/docs/9.3/static/uuid-ossp.html)
* [type definition](http://www.postgresql.org/docs/9.4/static/datatype-uuid.html)
* [pgcrypto generator function](http://www.postgresql.org/docs/9.4/static/pgcrypto.html#AEN159361)
* [uuid-ossp generator functions](http://www.postgresql.org/docs/9.4/static/uuid-ossp.html)
NOTE: you need to enable the `uuid-ossp` extension to use uuid.
NOTE: you need to enable the `pgcrypto` (only PostgreSQL >= 9.4) or `uuid-ossp`
extension to use uuid.
```ruby
# db/migrate/20131220144913_create_revisions.rb
@ -356,12 +358,13 @@ A point is casted to an array containing `x` and `y` coordinates.
UUID Primary Keys
-----------------
NOTE: you need to enable the `uuid-ossp` extension to generate UUIDs.
NOTE: you need to enable the `pgcrypto` (only PostgreSQL >= 9.4) or `uuid-ossp`
extension to generate random UUIDs.
```ruby
# db/migrate/20131220144913_create_devices.rb
enable_extension 'uuid-ossp' unless extension_enabled?('uuid-ossp')
create_table :devices, id: :uuid, default: 'uuid_generate_v4()' do |t|
enable_extension 'pgcrypto' unless extension_enabled?('pgcrypto')
create_table :devices, id: :uuid, default: 'gen_random_uuid()' do |t|
t.string :kind
end