  :attr:`~CharField.max_length`, a default of 200 is used.
  
  .. versionadded:: 1.5
  
  The current value of the field will be displayed as a clickable link above the
  input widget.
  
  
  Relationship fields
  ===================
  
 
</s> remove     The current value of the field will be displayed as a clickable link above the
    input widget.
 </s> add         The current value of the field will be displayed as a clickable link above the
        input widget. </s> remove If fields in the serialized data do not exist on a model,
a ``DeserializationError`` will be raised unless the ``ignorenonexistent``
argument is passed in as True::
 </s> add     If fields in the serialized data do not exist on a model,
    a ``DeserializationError`` will be raised unless the ``ignorenonexistent``
    argument is passed in as True:: </s> remove         Historically, this parameter was only called ``mimetype`` (now
        deprecated), but since this is actually the value included in the HTTP
        ``Content-Type`` header, it can also include the character set
        encoding, which makes it more than just a MIME type specification. If
        ``mimetype`` is specified (not ``None``), that value is used.
        Otherwise, ``content_type`` is used. If neither is given,
        :setting:`DEFAULT_CONTENT_TYPE` is used.
 </s> add             Historically, this parameter was only called ``mimetype`` (now
            deprecated), but since this is actually the value included in the HTTP
            ``Content-Type`` header, it can also include the character set
            encoding, which makes it more than just a MIME type specification. If
            ``mimetype`` is specified (not ``None``), that value is used.
            Otherwise, ``content_type`` is used. If neither is given,
            :setting:`DEFAULT_CONTENT_TYPE` is used. </s> remove         ``success_url`` may contain dictionary string formatting, which
        will be interpolated against the object's field attributes. For
        example, you could use ``success_url="/parent/%(parent_id)s/"`` to
        redirect to a URL composed out of the ``parent_id`` field on a model.
 </s> add             ``success_url`` may contain dictionary string formatting, which
            will be interpolated against the object's field attributes. For
            example, you could use ``success_url="/parent/%(parent_id)s/"`` to
            redirect to a URL composed out of the ``parent_id`` field on a model. </s> remove Some fields in a model won't be deferred, even if you ask for them. You can
never defer the loading of the primary key. If you are using
:meth:`select_related()` to retrieve related models, you shouldn't defer the
loading of the field that connects from the primary model to the related
one, doing so will result in an error.
 </s> add     Some fields in a model won't be deferred, even if you ask for them. You can
    never defer the loading of the primary key. If you are using
    :meth:`select_related()` to retrieve related models, you shouldn't defer the
    loading of the field that connects from the primary model to the related
    one, doing so will result in an error.
    The current value of the field will be displayed as a clickable link above the
    input widget.
  :attr:`~CharField.max_length`, a default of 200 is used.
  
  .. versionadded:: 1.5
  
    The current value of the field will be displayed as a clickable link above the
    input widget.
    The current value of the field will be displayed as a clickable link above the
    input widget.
  
  
  Relationship fields
  ===================
  
keep keep keep keep replace replace keep keep keep keep keep
 Adapted uses of versionchanged/versionadded to the new form.

Refs #20104. 
docs/ref/models/fields.txt