[Django] #28356: Serializer got error when datetime field receive string instead datetime object

[Django]

#28356: Serializer got error when datetime field receive string instead datetime
object
-------------------------------------+-------------------------------------
               Reporter:             |          Owner:  nobody
  Hermogenes Batista da Silva Filho  |
                   Type:  Bug        |         Status:  new
              Component:             |        Version:  1.11
  Uncategorized                      |
               Severity:  Normal     |       Keywords:  serializer
           Triage Stage:             |      Has patch:  1
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  1
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 Hi, I got an error, when I tried to serialize one model with DatetimeField
 and it have a string in valid format to parse it from datetime. I got it
 when I called `serializer.serializer`, one simplest case to reproduce it
 is that:

 {{{
 # models.py
 from django.db import models

 class SomeModel(models.Model):
     some_datetime = models.DateTimeField()

 }}}

 {{{
 # Script which you want to serialize model
 from django.core import serializers
 from MyAPP.models import SomeModel

 some_model = SomeModel(some_datetime="2017-02-02T00:00:00")
 # We didn't have problem if you save it
 some_model.save()

 # But if you tried to serialize it, you got an error, because inside
 method
 # it expected `datetime` object and it will raise an exception
 # `AttributeError: 'str' object has no attribute 'isoformat'`
 serialized_object = serializers.serialize('json', [some_model])

 }}}

 To fix it, we need to check if value is a string, and if have a valid
 format (using `parse_datetime` function), if is `None` we raise an
 exception (`ValidationError`).

-- 
Ticket URL: <https://code.djangoproject.com/ticket/28356>
Django <https://code.djangoproject.com/>
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