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Diffstat (limited to 'guides/source/migrations.md')
| -rw-r--r-- | guides/source/migrations.md | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/guides/source/migrations.md b/guides/source/migrations.md index cefbc3b829..d738d847e9 100644 --- a/guides/source/migrations.md +++ b/guides/source/migrations.md @@ -344,6 +344,16 @@ create_join_table :products, :categories, column_options: {null: true} will create the `product_id` and `category_id` with the `:null` option as `true`. +`create_join_table` also accepts a block, which you can use to add indices +(which are not created by default) or additional columns: + +```ruby +create_join_table :products, :categories do |t| + t.index :products + t.index :categories +end +``` + ### Changing Tables A close cousin of `create_table` is `change_table`, used for changing existing @@ -444,7 +454,7 @@ class ExampleMigration < ActiveRecord::Migration end ``` -Using `reversible` will insure that the instructions are executed in the +Using `reversible` will ensure that the instructions are executed in the right order too. If the previous example migration is reverted, the `down` block will be run after the `home_page_url` column is removed and right before the table `products` is dropped. |