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Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_record_postgresql.md | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md index 4d9c1776f4..395eda1644 100644 --- a/guides/source/active_record_postgresql.md +++ b/guides/source/active_record_postgresql.md @@ -245,6 +245,7 @@ article.save! * [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) +NOTE: you need to enable the `uuid-ossp` extension to use uuid. ```ruby # db/migrate/20131220144913_create_revisions.rb @@ -263,6 +264,30 @@ revision = Revision.first revision.identifier # => "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11" ``` +You can use `uuid` type to define references in migrations + +```ruby +# db/migrate/20150418012400_create_blog.rb +def change + create_table :posts, id: :uuid +end + +create_table :comments, id: :uuid do |t| + # t.belongs_to :post, type: :uuid + t.references :post, type: :uuid +end + +# app/models/post.rb +class Post < ActiveRecord::Base + has_many :comments +end + +# app/models/comment.rb +class Comment < ActiveRecord::Base + belongs_to :post +end +``` + ### Bit String Types * [type definition](http://www.postgresql.org/docs/9.3/static/datatype-bit.html) |