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Add extention to obtain the missing constant from NameError instances

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4679 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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1 parent 8225271 commit 196fab9b0dcbdc83e27241678ebb2557ca4e030e @seckar seckar committed Aug 5, 2006
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2 activesupport/CHANGELOG
@@ -1,5 +1,7 @@
*SVN*
+* Add extention to obtain the missing constant from NameError instances. [Nicholas Seckar]
+
* Thoroughly document inflections. #5700 [petermichaux@gmail.com]
* Added Module#alias_attribute [Jamis/DHH]. Example:
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15 activesupport/lib/active_support/core_ext/name_error.rb
@@ -0,0 +1,15 @@
+
+# Add a +missing_name+ method to NameError instances.
+class NameError < StandardError
+
+ # Add a method to obtain the missing name from a NameError.
+ def missing_name
+ $1 if /((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/ =~ message
+ end
+
+ # Was this exception raised because the given name was missing?
+ def missing_name?(name)
+ missing_name == name.to_s
+ end
+
+end
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27 activesupport/test/core_ext/name_error_test.rb
@@ -0,0 +1,27 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/name_error'
+
+class NameErrorTest < Test::Unit::TestCase
+
+ def test_name_error_should_set_missing_name
+ begin
+ SomeNameThatNobodyWillUse____Really ? 1 : 0
+ flunk "?!?!"
+ rescue NameError => exc
+ assert_equal "SomeNameThatNobodyWillUse____Really", exc.missing_name
+ assert exc.missing_name?(:SomeNameThatNobodyWillUse____Really)
+ assert exc.missing_name?("SomeNameThatNobodyWillUse____Really")
+ end
+ end
+
+ def test_missing_method_should_ignore_missing_name
+ begin
+ some_method_that_does_not_exist
+ flunk "?!?!"
+ rescue NameError => exc
+ assert_equal nil, exc.missing_name
+ assert ! exc.missing_name?(:Foo)
+ end
+ end
+
+end

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