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-rw-r--r--activemodel/lib/active_model/errors.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 0b6c75c46e..2e5bcab070 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -60,9 +60,11 @@ module ActiveModel
# error can be added to the same +attribute+ in which case an array will be returned on a call to <tt>on(attribute)</tt>.
# If no +messsage+ is supplied, :invalid is assumed.
# If +message+ is a Symbol, it will be translated, using the appropriate scope (see translate_error).
+ # If +message+ is a Proc, it will be called, allowing for things like Time.now to be used within an error
def add(attribute, message = nil, options = {})
message ||= :invalid
message = generate_message(attribute, message, options) if message.is_a?(Symbol)
+ message = message.call if message.is_a?(Proc)
self[attribute] << message
end