#29318: ValidationError has no attribute `error_list` if message is a dict, but
Field.run_validators() depends on it
-------------------------------+--------------------------------------
     Reporter:  Michael Käufl  |                    Owner:  nobody
         Type:  Bug            |                   Status:  new
    Component:  Core (Other)   |                  Version:  master
     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
-------------------------------+--------------------------------------

Comment (by Michael Käufl):

 Sure.  Consider a JSONField with an allowed list of keys:

 {{{
 if key not in allowed_keys:
     raise ValidationError({key: 'Not allowed.'})
 }}}

 We use these exceptions not only for the admin, but also for API error
 messages through django rest framework's [http://www.django-rest-
 framework.org/api-guide/exceptions/#custom-exception-handling custom
 exception handling].  This is also the reason, why we use the field's name
 in some other (therefore non-generic) validators.  Using the field's name
 as key in the error_dict, allows our front-end to display the error
 message at the affected field and not as a generic error message of the
 form.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29318#comment:2>
Django <https://code.djangoproject.com/>
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