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Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/upgrading_ruby_on_rails.md | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md index 0aa2152d56..49834fa8a2 100644 --- a/guides/source/upgrading_ruby_on_rails.md +++ b/guides/source/upgrading_ruby_on_rails.md @@ -883,6 +883,20 @@ this gem such as `whitelist_attributes` or `mass_assignment_sanitizer` options. * To re-enable the old finders, you can use the [activerecord-deprecated_finders gem](https://github.com/rails/activerecord-deprecated_finders). +* Rails 4.0 has changed to default join table for `has_and_belongs_to_many` relations to strip the common prefix off the second table name. Any existing `has_and_belongs_to_many` relationship between models with a common prefix must be specified with the `join_table` option. For example: + +```ruby +CatalogCategory < ActiveRecord::Base + has_and_belongs_to_many :catalog_products, join_table: 'catalog_categories_catalog_products' +end + +CatalogProduct < ActiveRecord::Base + has_and_belongs_to_many :catalog_categories, join_table: 'catalog_categories_catalog_products' +end +``` + +* Note that the the prefix takes scopes into account as well, so relations between `Catalog::Category` and `Catalog::Product` or `Catalog::Category` and `CatalogProduct` need to be updated similarly. + ### Active Resource Rails 4.0 extracted Active Resource to its own gem. If you still need the feature you can add the [Active Resource gem](https://github.com/rails/activeresource) in your Gemfile. |