Method: Sequel::Plugins::ModificationDetection::InstanceMethods#changed_columns

Defined in:
lib/sequel/plugins/modification_detection.rb

#changed_columns ⇒ Object

Detect which columns have been modified by comparing the cached hash value to the hash of the current value.



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# File 'lib/sequel/plugins/modification_detection.rb', line 60

def changed_columns
  changed = super
  if vh = @values_hashes
    values = @values
    changed = changed.dup if frozen?
    vh.each do |c, v|
      match = values.has_key?(c) && v == values[c].hash
      if changed.include?(c)
        changed.delete(c) if match
      else
        changed << c unless match
      end
    end
  end
  changed
end