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-rw-r--r--activesupport/lib/active_support/callbacks.rb10
1 files changed, 10 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 0cfbed5588..2cffa342ef 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -94,6 +94,15 @@ module ActiveSupport
def halted_callback_hook(filter)
end
+ module Conditionals # :nodoc:
+ class Value
+ def initialize(&block)
+ @block = block
+ end
+ def call(target, value); @block.call(value); end
+ end
+ end
+
module Filters
Environment = Struct.new(:target, :halted, :value, :run_block)
@@ -415,6 +424,7 @@ module ActiveSupport
when String
l = eval "lambda { |value| #{filter} }"
lambda { |target, value| target.instance_exec(value, &l) }
+ when Conditionals::Value then filter
when ::Proc
if filter.arity > 1
return lambda { |target, _, &block|