Add +capitalize+ option to Inflector.humanize

So strings can be humanized without being capitalized:

    'employee_salary'.humanize                    # => "Employee salary"
    'employee_salary'.humanize(capitalize: false) # => "employee salary"

1 files changed, 11 insertions, 5 deletions

diff --git a/activesupport/lib/active_support/core_ext/string/inflections.rb b/activesupport/lib/active_support/core_ext/string/inflections.rb
index 56e8a5f98d..b7b750c77b 100644
--- a/activesupport/lib/active_support/core_ext/string/inflections.rb
+++ b/activesupport/lib/active_support/core_ext/string/inflections.rb
@@ -190,13 +190,19 @@ class String
     ActiveSupport::Inflector.classify(self)
   end
 
-  # Capitalizes the first word, turns underscores into spaces, and strips '_id'.
+  # Capitalizes the first word, turns underscores into spaces, and strips a
+  # trailing '_id' if present.
   # Like +titleize+, this is meant for creating pretty output.
   #
-  #   'employee_salary'.humanize # => "Employee salary"
-  #   'author_id'.humanize       # => "Author"
-  def humanize
-    ActiveSupport::Inflector.humanize(self)
+  # The capitalization of the first word can be turned off by setting the
+  # optional parameter +capitalize+ to false.
+  # By default, this parameter is true.
+  #
+  #   'employee_salary'.humanize              # => "Employee salary"
+  #   'author_id'.humanize                    # => "Author"
+  #   'author_id'.humanize(capitalize: false) # => "author"
+  def humanize(options = {})
+    ActiveSupport::Inflector.humanize(self, options)
   end
 
   # Creates a foreign key name from a class name.