diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/object')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/object/exclusion.rb | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/exclusion.rb b/activesupport/lib/active_support/core_ext/object/exclusion.rb new file mode 100644 index 0000000000..58dfb649e5 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/object/exclusion.rb @@ -0,0 +1,15 @@ +class Object + # Returns true if this object is excluded in the argument. Argument must be + # any object which responds to +#include?+. Usage: + # + # characters = ["Konata", "Kagami", "Tsukasa"] + # "MoshiMoshi".not_in?(characters) # => true + # + # This will throw an +ArgumentError+ if the argument doesn't respond + # to +#include?+. + def not_in?(another_object) + !another_object.include?(self) + rescue NoMethodError + raise ArgumentError.new("The parameter passed to #not_in? must respond to #include?") + end +end
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