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author | Jeremy Kemper <jeremy@bitsweat.net> | 2007-10-15 07:11:25 +0000 |
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committer | Jeremy Kemper <jeremy@bitsweat.net> | 2007-10-15 07:11:25 +0000 |
commit | bb4ebaa858c3c73888ffb4639f6854b78955f9ed (patch) | |
tree | cfa5bb228194f14cc03b9aff5f830fd5b82abfc7 | |
parent | fe234a1538dd96c6e0d3ca44b651fcc7abc4663e (diff) | |
download | rails-bb4ebaa858c3c73888ffb4639f6854b78955f9ed.tar.gz rails-bb4ebaa858c3c73888ffb4639f6854b78955f9ed.tar.bz2 rails-bb4ebaa858c3c73888ffb4639f6854b78955f9ed.zip |
object.duplicable? returns true if object.dup is safe. False for nil, true, false, symbols, and numbers; true otherwise. References #9333.
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7906 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
-rw-r--r-- | activesupport/CHANGELOG | 2 | ||||
-rw-r--r-- | activesupport/lib/active_support/core_ext/duplicable.rb | 37 | ||||
-rw-r--r-- | activesupport/test/core_ext/duplicable_test.rb | 22 |
3 files changed, 61 insertions, 0 deletions
diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG index fd0bd573c1..8d15d6622f 100644 --- a/activesupport/CHANGELOG +++ b/activesupport/CHANGELOG @@ -1,5 +1,7 @@ *SVN* +* object.duplicable? returns true if object.dup is safe. False for nil, true, false, symbols, and numbers; true otherwise. #9333 [sur] + * Time, Date and DateTime #advance accept :weeks option. #9866 [Geoff Buesing] * Fix Time#years_ago and #years_since from leap days. #9865 [Geoff Buesing] diff --git a/activesupport/lib/active_support/core_ext/duplicable.rb b/activesupport/lib/active_support/core_ext/duplicable.rb new file mode 100644 index 0000000000..adbbfd8c60 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/duplicable.rb @@ -0,0 +1,37 @@ +class Object + # Can you safely .dup this object? + # False for nil, false, true, symbols, and numbers; true otherwise. + def duplicable? + true + end +end + +class NilClass #:nodoc: + def duplicable? + false + end +end + +class FalseClass #:nodoc: + def duplicable? + false + end +end + +class TrueClass #:nodoc: + def duplicable? + false + end +end + +class Symbol #:nodoc: + def duplicable? + false + end +end + +class Numeric #:nodoc: + def duplicable? + false + end +end diff --git a/activesupport/test/core_ext/duplicable_test.rb b/activesupport/test/core_ext/duplicable_test.rb new file mode 100644 index 0000000000..7f8c0f7d3b --- /dev/null +++ b/activesupport/test/core_ext/duplicable_test.rb @@ -0,0 +1,22 @@ +require File.dirname(__FILE__) + '/../abstract_unit' + +class DuplicableTest < Test::Unit::TestCase + NO = [nil, false, true, :symbol, 1, 2.3, BigDecimal.new('4.56')] + YES = ['1', Object.new, /foo/, [], {}] + + def test_duplicable + NO.each do |v| + assert !v.duplicable? + begin + v.dup + fail + rescue Exception + end + end + + YES.each do |v| + assert v.duplicable? + assert_nothing_raised { v.dup } + end + end +end |