Add Enumerable#pluck.

Allows fetching the same values from arrays as from ActiveRecord associations.

1 files changed, 8 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index 7a893292b3..d28f26260e 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -71,6 +71,14 @@ module Enumerable
   def without(*elements)
     reject { |element| elements.include?(element) }
   end
+
+  # Convert an enumerable to an array based on the given key.
+  #
+  #   [{ name: "David" }, { name: "Rafael" }, { name: "Aaron" }].pluck(:name)
+  #     => ["David", "Rafael", "Aaron"]
+  def pluck(key)
+    map { |element| element[key] }
+  end
 end
 
 class Range #:nodoc: