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Diffstat (limited to 'guides/source/upgrading_ruby_on_rails.md')
| -rw-r--r-- | guides/source/upgrading_ruby_on_rails.md | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md index ca5623bf73..60b27aa6e5 100644 --- a/guides/source/upgrading_ruby_on_rails.md +++ b/guides/source/upgrading_ruby_on_rails.md @@ -156,6 +156,23 @@ end ActiveRecord::FixtureSet.context_class.send :include, FixtureFileHelpers ``` +### Mutator methods called on Relation + +`Relation` no longer has mutator methods like `#map!` and `#delete_if`. Convert +to an `Array` by calling `#to_a` before using these methods. + +It intends to prevent odd bugs and confusion in code that call mutator +methods directly on the `Relation`. + +```ruby +# Instead of this +Author.where(name: 'Hank Moody').compact! + +# Now you have to do this +authors = Author.where(name: 'Hank Moody').to_a +authors.compact! +``` + Upgrading from Rails 3.2 to Rails 4.0 ------------------------------------- |