     The ``connection`` argument was added to support multiple databases.
  
  Same as the above, but called when the Field value must be *saved* to
  the database. As the default implementation just calls
  ``get_db_prep_value``, you shouldn't need to implement this method
  unless your custom field needs a special conversion when being saved
  that is not the same as the conversion used for normal query
  parameters (which is implemented by ``get_db_prep_value``).
  
  Preprocessing values before saving
 
</s> remove parameters (which is implemented by ``get_db_prep_value``).
 </s> add parameters (which is implemented by :meth:`.get_db_prep_value`). </s> remove .. method:: get_db_prep_save(self, value, connection)
 </s> add .. method:: Field.get_db_prep_save(self, value, connection) </s> remove :meth:`get_db_prep_value` is the method where those conversions should
 </s> add :meth:`.get_db_prep_value` is the method where those conversions should </s> remove .. method:: pre_save(self, model_instance, add)
 </s> add .. method:: Field.pre_save(self, model_instance, add) </s> remove and pass the rest to the :meth:`get_db_prep_lookup` method of the parent class.
 </s> add and pass the rest to the :meth:`.get_db_prep_lookup` method of the parent class.
:meth:`.get_db_prep_value`, you shouldn't need to implement this method
     The ``connection`` argument was added to support multiple databases.
  
  Same as the above, but called when the Field value must be *saved* to
  the database. As the default implementation just calls
:meth:`.get_db_prep_value`, you shouldn't need to implement this method
  unless your custom field needs a special conversion when being saved
  that is not the same as the conversion used for normal query
  parameters (which is implemented by ``get_db_prep_value``).
  
  Preprocessing values before saving
keep keep keep keep replace keep keep keep keep keep
 Fixed #15308 -- Sphinx/reST fixes for the Custom Model Fields docs.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15547 bcc190cf-cafb-0310-a4f2-bffc1f526a37 
docs/howto/custom-model-fields.txt