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| -rw-r--r-- | activesupport/CHANGELOG.md | 15 | ||||
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 15 |
2 files changed, 30 insertions, 0 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md index 62c0f612a8..a384fc3bd2 100644 --- a/activesupport/CHANGELOG.md +++ b/activesupport/CHANGELOG.md @@ -1,3 +1,18 @@ +* Add `index_with` to Enumerable. + + Allows creating a hash from an enumerable with the value from a passed block + or a default argument. + + %i( title body ).index_with { |attr| post.public_send(attr) } + # => { title: "hey", body: "what's up?" } + + %i( title body ).index_with(nil) + # => { title: nil, body: nil } + + Closely linked with its brethen `index_by`. + + *Kasper Timm Hansen* + * Fix bug where `ActiveSupport::Timezone.all` would fail when tzinfo data for any timezone defined in `ActiveSupport::TimeZone::MAPPING` is missing. diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index ae2e1faf14..cde217e1e4 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -2039,6 +2039,21 @@ WARNING. Keys should normally be unique. If the block returns the same value for NOTE: Defined in `active_support/core_ext/enumerable.rb`. +### `index_with` + +The method `index_with` generates a hash with the elements of an enumerable as keys. The value +is either a passed default or returned in a block. + +```ruby +%i( title body created_at ).index_with { |attr_name| public_send(attr_name) } +# => { title: "hey", body: "what's up?", … } + +WEEKDAYS.index_with([ Interval.all_day ]) +# => { monday: [ 0, 1440 ], … } +``` + +NOTE: Defined in `active_support/core_ext/enumerable.rb`. + ### `many?` The method `many?` is shorthand for `collection.size > 1`: |