Escaping symbol passed into Memoizable's flush_cache for query methods to allow them to be cleared

Signed-off-by: Michael Koziarski <michael@koziarski.com>

[#3138 state:committed]

activesupport/lib/active_support/memoizable.rb

@@ -57,10 +57,10 @@ def prime_cache(*syms)
         end
       end
 
-      def flush_cache(*syms, &block)
+      def flush_cache(*syms)
         syms.each do |sym|
           (methods + private_methods + protected_methods).each do |m|
-            if m.to_s =~ /^_unmemoized_(#{sym})/
+            if m.to_s =~ /^_unmemoized_(#{sym.to_s.gsub(/\?\Z/, '\?')})/
               ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
               instance_variable_get(ivar).clear if instance_variable_defined?(ivar)
             end

activesupport/test/memoizable_test.rb

@@ -4,12 +4,13 @@ class MemoizableTest < ActiveSupport::TestCase
   class Person
     extend ActiveSupport::Memoizable
 
-    attr_reader :name_calls, :age_calls, :is_developer_calls
+    attr_reader :name_calls, :age_calls, :is_developer_calls, :name_query_calls
 
     def initialize
       @name_calls = 0
       @age_calls = 0
       @is_developer_calls = 0
+      @name_query_calls = 0
     end
 
     def name
@@ -18,6 +19,7 @@ def name
     end
 
     def name?
+      @name_query_calls += 1
       true
     end
     memoize :name?
@@ -116,6 +118,13 @@ def test_memoization_with_punctuation
     end
   end
 
+  def test_memoization_flush_with_punctuation
+    assert_equal true, @person.name?
+    @person.flush_cache(:name?)
+    3.times { assert_equal true, @person.name? }
+    assert_equal 2, @person.name_query_calls
+  end
+
   def test_memoization_with_nil_value
     assert_equal nil, @person.age
     assert_equal 1, @person.age_calls