Added Array#to_sentence that'll turn ['one', 'two', 'three'] into 'one, two, and three' #2157 [m.stienstra@fngtps.com]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2185 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 22 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
new file mode 100644
index 0000000000..19220da2b1
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -0,0 +1,22 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Array #:nodoc:
+      # Enables to conversion of Arrays to human readable lists. ['one', 'two', 'three'] => "one, two, and three"
+      module Conversions
+        # Converts the array to comma-seperated sentence where the last element is joined by the connector word (default is 'and').
+        def to_sentence(connector = 'and')
+          if length > 1
+            "#{self[0...-1].join(', ')}, #{connector} #{self[-1]}"
+          elsif length == 1
+            self[0]
+          end
+        end
+
+        # When an array is given to url_for, it is converted to a slash separated string.
+        def to_param
+          join '/'
+        end
+      end
+    end
+  end
+end