#29294: ModelAdmin.raw_id_fields should be included in select_related() by
change_view and used by raw id widget
-------------------------------------+-------------------------------------
     Reporter:  Yurii Zolot'ko       |                    Owner:  nobody
         Type:                       |                   Status:  new
  Cleanup/optimization               |
    Component:  contrib.admin        |                  Version:  1.11
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Jurrian Tromp):

 * status:  closed => new
 * resolution:  needsinfo =>


Comment:

 You are right, I am sorry. I left out the `BoundField` part which is
 indeed elemental. See the attachment for a working example,
 `ModelChoiceField` and `RawIdWidgetAdminMixin` are just there to patch it
 to make it work in my project, they are not part of this.

 The way I see it there is just one way to have the `value` supplied to
 `label_and_url_for_value` to be a model instance:

 {{{
 class BoundField(boundfield.BoundField):
     def value(self):
         if type(self.field.widget) == ForeignKeyRawIdWidget:
             try:
                 return getattr(self.form.instance, self.name)
             except AttributeError:
                 pass
 ...
 }}}

 However this feels hacky to me, although I can not find another way to get
 the model instance except for from the form. When being rendered, the
 `ForeignKeyRawIdWidget` has no access to the form anymore, so it seems the
 only place where we can pass it on is in the `BoundField`.
 What do you think?

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29294#comment:4>
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