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Instance Public methods
raw_write_attribute(attr_name, value)
write_attribute(attr_name, value)

Updates the attribute identified by attr_name with the specified value. Empty strings for fixnum and float columns are turned into nil.

Also aliased as: raw_write_attribute

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/write.rb, line 25
def write_attribute(attr_name, value)
  attr_name = attr_name.to_s
  attr_name = self.class.primary_key if attr_name == 'id' && self.class.primary_key
  @attributes_cache.delete(attr_name)
  column = column_for_attribute(attr_name)

  if column || @attributes.has_key?(attr_name)
    @attributes[attr_name] = type_cast_attribute_for_write(column, value)
  else
    raise ActiveModel::MissingAttributeError, "can't write unknown attribute `#{attr_name}'"
  end
end