Methods
W
Instance Public methods
write_attribute(attr_name, value)

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

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/write.rb, line 31
def write_attribute(attr_name, value)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  name = @primary_key if name == "id" && @primary_key
  _write_attribute(name, value)
end