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| author | Joshua Wood <josh@hintmedia.com> | 2012-03-02 17:59:23 -0800 |
|---|---|---|
| committer | Joshua Wood <josh@hintmedia.com> | 2012-04-14 14:18:42 -0700 |
| commit | ca0af8221a3b704fa289afe7030a96dc8cec8a95 (patch) | |
| tree | c3100645cc5ef8e41d5d7fdd86b100a5c6efa85b /guides/source/migrations.textile | |
| parent | d55eea15008bc4674f761b2494b33c22eb9e15e9 (diff) | |
| download | rails-ca0af8221a3b704fa289afe7030a96dc8cec8a95.tar.gz rails-ca0af8221a3b704fa289afe7030a96dc8cec8a95.tar.bz2 rails-ca0af8221a3b704fa289afe7030a96dc8cec8a95.zip | |
Automatically create indexes for references/belongs_to statements in migrations.
Diffstat (limited to 'guides/source/migrations.textile')
| -rw-r--r-- | guides/source/migrations.textile | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/guides/source/migrations.textile b/guides/source/migrations.textile index f663496854..aa75e9ab4a 100644 --- a/guides/source/migrations.textile +++ b/guides/source/migrations.textile @@ -475,7 +475,16 @@ end </ruby> will add an +attachment_id+ column and a string +attachment_type+ column with -a default value of 'Photo'. +a default value of 'Photo'. +references+ also allows you to define an +index directly, instead of using +add_index+ after the +create_table+ call: + +<ruby> +create_table :products do |t| + t.references :category, :index => true +end +</ruby> + +will create an index identical to calling `add_index :products, :category_id`. NOTE: The +references+ helper does not actually create foreign key constraints for you. You will need to use +execute+ or a plugin that adds "foreign key |