Question

我有一个带有ManyToManyField的模型，并希望在创建该模型时从其他表中添加所有数据。这是我到目前为止所获得的代码，它不保存条目：

'''
Klassendefinition für den Spieltag
'''

from django.db import models
from django.dispatch import receiver
from django.utils.translation import ugettext_lazy as _

from django_extensions.db.models import TimeStampedModel

from season.models import Season
from player.models import Player

# Create your models here.

class Matchday(TimeStampedModel):
    '''
    Klasse für den Spieltag
    '''

    seasontable = models.ManyToManyField("table.Table", related_name="Ligaspieltisch", blank=True)
    matchtable = models.ManyToManyField("table.Table", related_name="Pfeilsystemtisch", blank=True)
    #Spieler die am Spieltag angemeldet sind (Kickereuro)
    signedin = models.ManyToManyField("player.Player", related_name="Angemeldet", blank=True)

    needtopay = models.BooleanField(_("Soll der Kickereuro gezahlt werden?"), default=True)
    finished = models.BooleanField(_("Beendet?"), default=False)

    season = models.ForeignKey(Season, verbose_name=_("Saison"), blank=True, null=True)

    class Meta:
        '''
        Metaklasse für Spieltag
        '''
        verbose_name = _("Spieltag")
        verbose_name_plural = _("Spieltage")
        ordering = ('-created',)

    def __str__(self):
        return "Spieltag"

@receiver(models.signals.post_save, sender=Matchday)
def execute_after_save(sender, instance, created, *args, **kwargs):
    '''
    Ausführen, wenn matchday gespeichert wird
    '''
    if created: #Wurde matchday neu erstellt?
        if not instance.needtopay:
            #Kickereuro muss nicht gezahlt werden -> alle Spieler hinzufügen
            instance.save()
            players = Player.objects.all()
            players = list(players)
            for player in players:
                instance.signedin.add(player)
            instance.save()
            players = instance.signedin.all()
            print(players)

打印（播放器）用于调试目的并正确返回播放器列表，但不保存。我在开始时没有 instance.save（）和 instance.signedin.add（*播放器）尝试了它，两者都不起作用。我在这里做错了什么？

创建后将数据添加到ManyToManyField

0 个答案: