#24509: Allow Expressions when saving new models
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     Reporter:  AlexHill             |                    Owner:
         Type:  New feature          |                   Status:  new
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by carljm):

 Just for future reference for whoever works on this: I spent a few minutes
 looking at this tonight and I think that implementing this _might_ allow
 us to get rid of the whole `Field.get_placeholder()` hook, which is
 effectively just a hacky way to allow fields to wrap their values in an
 arbitrary SQL expression at save time. (Currently only GIS fields use this
 hook in core.)

 In the meantime, if you're wishing Django 1.8 had this feature,
 `get_placeholder()` appears to be a usable workaround (for any given
 specific field type; doesn't offer generic support).

--
Ticket URL: <https://code.djangoproject.com/ticket/24509#comment:6>
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