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Merge pull request #19972 from robertjlooby/document_habtm_changes_in_upgrade_guide

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add upgrade note for breaking habtm change in 3.2 -> 4.0
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Rafael Mendonça França 2015-05-03 17:45:35 -03:00
commit 76feb8b8de
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guides/source/upgrading_ruby_on_rails.md
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@ -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.