diff options
Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/active_record_postgresql.md | 23 | ||||
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 4 |
2 files changed, 25 insertions, 2 deletions
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md index 4d9c1776f4..66a11e5785 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 +264,28 @@ 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 +create_table :posts, id: :uuid + +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) diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index ff60f95a2c..fe2ab27a5a 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -2188,7 +2188,7 @@ The method `without` returns a copy of an enumerable with the specified elements removed: ```ruby -people.without("Aaron", "Todd") +["David", "Rafael", "Aaron", "Todd"].without("Aaron", "Todd") # => ["David", "Rafael"] ``` NOTE: Defined in `active_support/core_ext/enumerable.rb`. @@ -2428,7 +2428,7 @@ The method `Array.wrap` wraps its argument in an array unless it is already an a Specifically: -* If the argument is `nil` an empty list is returned. +* If the argument is `nil` an empty array is returned. * Otherwise, if the argument responds to `to_ary` it is invoked, and if the value of `to_ary` is not `nil`, it is returned. * Otherwise, an array with the argument as its single element is returned. |