Re: DateTimeField always returns None

Date isn't *disallowed* as a field name: 


As long as it's quoted, it's an allowed name.

However, it's *really* not recommended.

This isn't for database related reasons - it's the Python side that is problematic. The name of the class used to *store* date objects is also named "date". As a result, you're going to get all sorts of unpredictable namespace conflicts, because at various times in the same module, "date" will be either a class or a model field. Unless you're *very* careful about imports and how you use them, you're going to trip over unexpected behaviours.

This is probably something we should add to the model warning suite; if someone is looking for an project to get involved with Django, this would be a relatively easy feature to add.

Yours,
Russ Magee %-)




On Sun, Jul 6, 2014 at 10:51 AM, Dean <dean.hd5@gmail.com> wrote:
I think there is a restriction in using 'date' in MySQL as a field name as it's some sort of inbuilt function.

On Friday, July 4, 2014 5:01:15 PM UTC+8, William Granli wrote:

I am trying to create a queryset for getting the values of a DateTimeField which is DATETIME in the DB.

The class in models.py:

  class ChangeMetrics(models.Model):      id = models.IntegerField(primary_key=True)      file_id = models.ForeignKey(File, db_column = 'file_id')      version_id = models.ForeignKey(Version, db_column = 'version_id')      function_id = models.ForeignKey(Function, blank=True, db_column = 'function_id')      date = models.DateTimeField(blank=True, null=True)      user = models.TextField(blank=True)      changed = models.IntegerField(blank=True, null=True)

The field in the SQL DB:

  date DATETIME

The tuples are populated in the database and running SQL queries directly on the DB is working perfectly.

This is the queryset I am currently using in Django:

  queryset = ChangeMetrics.objects.filter(~Q(changed=None), ~Q(date=None), ~Q(version_id=None))

I have tried a raw query and also a version of the query that uses exclude(), but that still returns None for date.

I am accessing the entries in the queryset through a for loop and simply accessing date through entry.date inside the for loop.

I am using Django version 1.6.5. I have also tried getting the values through the Django shell, to no success.

Any ideas on what could be wrong? I have tried a multitude of queries, none of them change the returned value of date. I have tried resyncing the DB. I've looked over the models and everything seems to be correct. Everything except the date works fine.

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