djangoforms.py 文件源码

def get_value_for_form(self, instance):
    """Extract the property value from the instance for use in a form.

    This joins a list of strings with newlines.
    """
    value = super(StringListProperty, self).get_value_for_form(instance)
    if not value:
      return None
    if isinstance(value, list):
      value = '\n'.join(value)
    return value