Methods
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Classes and Modules
Instance Protected methods
_attribute(attr_name)

Source: show | on GitHub 

    # File activerecord/lib/active_record/attribute_methods/deprecated_underscore_read.rb, line 23
23:       def _attribute(attr_name)
24:         ActiveSupport::Deprecation.warn(
25:           "You have called '_#{attr_name}'. This is deprecated. Please use " \
26:           "either '#{attr_name}' or read_attribute('#{attr_name}')."
27:         )
28:         read_attribute(attr_name)
29:       end