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author | Jamis Buck <jamis@37signals.com> | 2007-01-15 17:12:32 +0000 |
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committer | Jamis Buck <jamis@37signals.com> | 2007-01-15 17:12:32 +0000 |
commit | f28eef9a272fd9280416fd8c0984f616ffe102fe (patch) | |
tree | 96acb772243c040f574563fc39a9855773d6139e /activesupport/lib/active_support/core_ext/object | |
parent | 8368e160b4acddf0204a84a9f8d360dcd99fe0ce (diff) | |
download | rails-f28eef9a272fd9280416fd8c0984f616ffe102fe.tar.gz rails-f28eef9a272fd9280416fd8c0984f616ffe102fe.tar.bz2 rails-f28eef9a272fd9280416fd8c0984f616ffe102fe.zip |
Add Object#acts_like? and Time#acts_like_time? and Date#acts_like_date? to facilitate duck-typing
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5951 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activesupport/lib/active_support/core_ext/object')
-rw-r--r-- | activesupport/lib/active_support/core_ext/object/misc.rb | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/misc.rb b/activesupport/lib/active_support/core_ext/object/misc.rb index ea8e3a1d6a..aae336e6f4 100644 --- a/activesupport/lib/active_support/core_ext/object/misc.rb +++ b/activesupport/lib/active_support/core_ext/object/misc.rb @@ -31,4 +31,13 @@ class Object #:nodoc: def to_json ActiveSupport::JSON.encode(self) end + + # A duck-type assistant method. For example, ActiveSupport extends Date + # to define an acts_like_date? method, and extends Time to define + # acts_like_time?. As a result, we can do "x.acts_like?(:time)" and + # "x.acts_like?(:date)" to do duck-type-safe comparisons, since classes that + # we want to act like Time simply need to define an acts_like_time? method. + def acts_like?(duck) + respond_to? :"acts_like_#{duck}?" + end end
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