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| -rw-r--r-- | railties/guides/source/active_support_overview.textile | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile index 2248ba33c3..e7751b32b1 100644 --- a/railties/guides/source/active_support_overview.textile +++ b/railties/guides/source/active_support_overview.textile @@ -84,6 +84,24 @@ 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. +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. + +For example, the following class method from +ActionDispatch::TestResponse+ creates, initializes, and returns a new test response using +tap+: + +<ruby> +def self.from_response(response) + new.tap do |resp| + resp.status = response.status + resp.headers = response.headers + resp.body = response.body + end +end +</ruby> + +See also +Object#returning+ in "Extensions to All Objects FIX THIS LINK":FIXME. + h4. +metaclass+ |