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-rw-r--r--activemodel/lib/active_model/observing.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb
index eb853f01ee..c6a79acf81 100644
--- a/activemodel/lib/active_model/observing.rb
+++ b/activemodel/lib/active_model/observing.rb
@@ -1,6 +1,7 @@
require 'singleton'
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/module/aliasing'
+require 'active_support/core_ext/module/remove_method'
require 'active_support/core_ext/string/inflections'
module ActiveModel
@@ -157,7 +158,7 @@ module ActiveModel
def observe(*models)
models.flatten!
models.collect! { |model| model.respond_to?(:to_sym) ? model.to_s.camelize.constantize : model }
- remove_method(:observed_classes)
+ remove_possible_method(:observed_classes)
define_method(:observed_classes) { models }
end