
Lib/active_model/serializer/adapter/attributes.rb, Lib/active_model/serializer/lazy_association.rb, Lib/active_model/serializer/error_serializer.rb, Lib/active_model/serializer/concerns/caching.rb,
Lib/active_model/serializer/array_serializer.rb, Lib/active_model/serializer/adapter/null.rb, Lib/active_model/serializer/adapter/json.rb, Lib/active_model/serializer/adapter/base.rb, Lib/active_model/serializer/association.rb, Lib/active_model/serializer/reflection.rb, Lib/active_model/serializer/attribute.rb,
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Bug when switching to Rails 4.1 - `method_missing': undefined method `whitelist_attributes=' for ActiveRecord::Base:Class (NoMethodError). What is causing this undefined method error in my Ruby on Rails / GraphQL project. Ruby on Rails Why do I get the error: undefined method `email' for 69:Fixnum when trying to send an email?. Ruby rails undefined method `empty?' for nil:NilClass when making a dropdown menu for objects in a class. Ruby on rails : undefined method `map' for nil:NilClass, what causes this? when i add record to table.