Ordering a Django QuerySet by a datetime's month/day?

Question

I have a list of people, each person having a birthdate, which is predictably stored in a DateField. I\'m trying to create a list of those people—sorted by the

Answer 1

I tested using django 1.10.8

from django.db.models.functions import Extract
from your_project.your_app.models import Person


CHOICE_MONTH = (
    (None, '--'),
    (1, 1),
    (2, 2),
    (3, 3),
    (4, 4),
    (5, 5),
    (6, 6),
    (7, 7),
    (8, 8),
    (9, 9),
    (10, 10),
    (11, 11),
    (12, 12),
)

class PersonSearchForm(forms.Form):

    name = forms.CharField(label=u'name', required=False)
    month = forms.ChoiceField(label='month', choices=CHOICE_MONTH, required=False)

    def __init__(self, *args, **kwargs):
        self.corporation = kwargs.pop('corporation', None)
        super(PersonSearchForm, self).__init__(*args, **kwargs)

    def get_result_queryset(self):
        q = Q(corporation=self.corporation)
        if self.is_valid():
            name = self.cleaned_data['name']
            if name:
                q = q & Q(name__icontains=name)
            month = self.cleaned_data['month']
            if month:
                q = q & Q(month=int(month))

        return Person.objects.annotate(month=Extract('birthday', 'month'),
                                       day=Extract('birthday', 'day')).filter(q).order_by('month', 'day')