#19299: Foreign keys using to_field and having legitimate empty string values 
fail
with NULL errors
-------------------------------------+-------------------------------------
     Reporter:  evan@…               |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  1.4
  (models, ORM)                      |               Resolution:
     Severity:  Normal               |             Triage Stage:  Accepted
     Keywords:                       |      Needs documentation:  0
    Has patch:  1                    |  Patch needs improvement:  0
  Needs tests:  0                    |                    UI/UX:  0
Easy pickings:  0                    |
-------------------------------------+-------------------------------------

Comment (by tunixman):

 I also do believe in the `get_db_prep_save` case we will need to check
 since we're not just returning the value in the case of NULL, but also
 chaining on some additional processing. I've updated the code locally and
 I'm rerunning the tests for it now.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/19299#comment:4>
Django <https://code.djangoproject.com/>
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