Merge commit 'origin/master' into savepoints

Conflicts:
	activerecord/lib/active_record/fixtures.rb
	activerecord/test/cases/defaults_test.rb

1 files changed, 4 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb
index 1ad18402e5..2905eebc85 100644
--- a/activesupport/lib/active_support/core_ext/module/delegation.rb
+++ b/activesupport/lib/active_support/core_ext/module/delegation.rb
@@ -78,6 +78,10 @@ class Module
       raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
     end
 
+    if options[:prefix] == true && options[:to].to_s =~ /^[^a-z_]/
+      raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method."
+    end
+
     prefix = options[:prefix] && "#{options[:prefix] == true ? to : options[:prefix]}_"
 
     methods.each do |method|