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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 |