assign_default_value

# File activerecord/lib/active_record/attribute_set/builder.rb, line 96
    def assign_default_value(name)
      type = additional_types.fetch(name, types[name])
      value_present = true
      value = values.fetch(name) { value_present = false }

      if value_present
        delegate_hash[name] = Attribute.from_database(name, value, type)
      elsif types.key?(name)
        delegate_hash[name] = Attribute.uninitialized(name, type)
      end
    end