Django templates echos empty property

Question

I searched but couldn't find similar question, so I apologies if this was already answered. Now let's get on topic. I have a model with @property values (3 of them). All of them works and one just return empty and I can't find a problem. Here is the part of model:

@property def case_number(self): ''' An formatted number officially designating this case. ''' s = u'%012d' % self.pk return s[:3] + '-' + s[3:6] + '-' + s[6:9] + '-' + s[9:] @property def case_id(self): ''' An formatted string, consisting of the prefix NCDAC- and the case number, officially designating this case. ''' return 'NCDAC-' + self.case_number @property def due_date(self): margin = self.report_date + datetime.timedelta(days=30); if timeuntil(margin) <= datetime.timedelta(days=1): return 'today' elif timeuntil(margin) < 0: return 'overdue' else: return timeuntil(margin).split(', ')[0]

And here is template part that displays DB results in rows:

 {% for case in sent_cases %} <tr> <td> <a href="{% url "case-detail" case.pk %}"> {{ case.case_number }} </a> </td> <td>{{ case.get_agency_display }}</td> <td>{{ case.report_date }}</td> <td> {% if case.status == "D" %} <i class="icon-minus-sign"></i> No {% else %} <i class="icon-ok-sign"></i> {{ case.ts_submitted|date:"d M Y" }} {% endif %} </td> <td>{{ case.due_date }}</td> </tr> {% endfor %}

Everything is working except {{ case.due_date }}. It's just empty block. Any idea why this is happening?

Thanks.

UPDATE: Ok I tried just to return "something" and it's working. I have a error bellow - for some reason it doesn't rise Exception though. self.report_date is defined as report_date = models.DateField(verbose_name='Report Date') and I'm trying to get how much days is left untill report_date + 30days.

As a test, try calling it from inside your view or from the console instead of the template and see if there's an exception getting thrown. The template renderer eats exceptions. — Joe Holloway
– Joe Holloway, Commented Nov 24, 2012 at 17:30
Make sure timeuntil(margin).split(', ')[0] this return some value?? — Aamir Rind
– Aamir Rind, Commented Nov 24, 2012 at 17:40
@JoeHolloway I tried calling that prop from View - nothing happened (no Exception). @AamirAdnan I tried previouslly to replace timeuntil(margin).split(', ')[0] with pure string like 'something' and still nothing was echoed in template. — NemanjaSRB
– NemanjaSRB, Commented Nov 24, 2012 at 17:43
Before returning timeuntil(margin).split(', ')[0] try to print out the return value in func due_date may be your logic is wrong and it is actually returning an empty string. — Aamir Rind
– Aamir Rind, Commented Nov 24, 2012 at 17:45

relekang · Accepted Answer · 2012-11-24 21:34:43Z

The function below should work. I moved the overdue check first, because the today check would also work for those dates since below 0 days also is below 1 day. I also removed the usage of timeuntil since you wrote that you wanted days.

def due_date(self): margin = self.report_date + datetime.timedelta(days=30) time_left = margin - datetime.datetime.now() if time_left < datetime.timedelta(days=0, hours=0, minutes=0): return 'overdue' elif time_left <= datetime.timedelta(days=1): return 'today' else: return '%s days' % time_left.days

Thanks! I was messing around it but couldn't solve problem with strings and date types. I guess this is a way to learn how carefull I should be when Python and data types are in question :) Thanks again.

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Django templates echos empty property

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