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-rw-r--r--activemodel/lib/active_model/forbidden_attributes_protection.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/forbidden_attributes_protection.rb b/activemodel/lib/active_model/forbidden_attributes_protection.rb
index a5e4c4f650..f4c5d536eb 100644
--- a/activemodel/lib/active_model/forbidden_attributes_protection.rb
+++ b/activemodel/lib/active_model/forbidden_attributes_protection.rb
@@ -1,4 +1,16 @@
module ActiveModel
+ # Raised when forbidden attributes are used for mass assignment.
+ #
+ # class Person < ActiveRecord::Base
+ # end
+ #
+ # params = ActionController::Parameters.new(name: 'Bob')
+ # Person.new(params)
+ # # => ActiveModel::ForbiddenAttributesError
+ #
+ # params.permit!
+ # Person.new(params)
+ # # => #<Person id: nil, name: "Bob">
class ForbiddenAttributesError < StandardError
end