diff options
| -rw-r--r-- | railties/guides/source/active_support_overview.textile | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile index d0e07137cc..de9212c307 100644 --- a/railties/guides/source/active_support_overview.textile +++ b/railties/guides/source/active_support_overview.textile @@ -84,6 +84,21 @@ By definition all objects are +duplicable?+ except +nil+, +false+, +true+, symbo WARNING. Using +duplicable?+ is discouraged because it depends on a hard-coded list. Classes have means to disallow duplication like removing +dup+ and +clone+ or raising exceptions from them, only +rescue+ can tell. +h4. +returning+ + +The method +returning+ yields its argument to a block and returns it. You tipically use it with a mutable object that gets modified in the block: + +<ruby> +def html_options_for_form(url_for_options, options, *parameters_for_url) + returning options.stringify_keys do |html_options| + html_options["enctype"] = "multipart/form-data" if html_options.delete("multipart") + html_options["action"] = url_for(url_for_options, *parameters_for_url) + end +end +</ruby> + +See also "+Object#tap+":#tap. + h4. +tap+ +Object#tap+ exists in Ruby 1.8.7 and 1.9, and it is defined by Active Support for previous versions. This method yields its receiver to a block and returns it. |