Python Django在创建另一个对象时创建并保存模型的多个实例

我正在设计一个国际象棋游戏，我想在新的

棋队开始后用国际象棋数字（状态模型）初始化字段
我读过关于重写
save（）
model方法的内容，但我不知道如何在我的案例中使用它

我读到了一些信号，比如
post\u save
，但我也有同样的问题

像这样的东西可以用吗

    def save(self, *args, **kwargs):
        (Here i want create many instances of another Model)
    super(ChessParty, self).save(*args, **kwargs)

这是我到目前为止的代码：

class ChessParty(models.Model):
    chessparty_id = models.AutoField("ID partii", primary_key=True)
    arbiter = models.ForeignKey(Arbiter, related_name='sedzia', 
    verbose_name="Sędzia")
    white = models.ForeignKey(Player, related_name='Białe', 
    verbose_name="Białe figury")
    black = models.ForeignKey(Player, related_name='Czarne', 
    verbose_name="Czarne figury")
    tournament = models.ForeignKey(Tournament, verbose_name="Nazwa turnieju")

    def __str__(self):
        return "{white} vs {black}, ({tournament})"\
            .format(black=self.black, white=self.white, tournament=self.tournament)


class OneMove(models.Model):
party = models.ForeignKey(ChessParty, default='0', verbose_name="Partia")
chessman = (
    ('a1_w_rook', 'biała wieża a1'), ('h1_w_rook', 'biała wieża h1'),
    ('b1_w_knight', 'biały skoczek b1'), ('g1_w_knight', 'biały skoczek g1'),
    ('c1_w_bishop', 'biały goniec c1'), ('f1_w_bishop', 'biały goniec f1'),
    ('d1_w_queen', 'biały hetman d1'), ('e1_w_king', 'biały król e1'),
    ('a2_w_pawn', 'biały pion a2'), ('b2_w_pawn', 'biały pion b2'),
    ('c2_w_pawn', 'biały pion c2'), ('d2_w_pawn', 'biały pion d2'),
    ('e2_w_pawn', 'biały pion e2'), ('f2_w_pawn', 'biały pion f2'),
    ('g2_w_pawn', 'biały pion g2'), ('h2_w_pawn', 'biały pion h2'),
    ('a8_b_rook', 'czarna wieża a1'), ('h8_b_rook', 'czarna wieża h8'),
    ('b8_b_knight', 'czarny skoczek b1'), ('g8_b_knight', 'czarny skoczek g8'),
    ('c8_b_knight', 'czarny goniec c1'), ('f8_b_bishop', 'czarny goniec f8'),
    ('d8_b_queen', 'czarny hetman d1'), ('e8_b_king', 'czarny król e8'),
    ('a7_b_pawn', 'czarny pion a7'), ('b7_b_pawn', 'czarny pion b7'),
    ('c7_b_pawn', 'czarny pion c7'), ('d7_b_pawn', 'czarny pion d7'),
    ('e7_b_pawn', 'czarny pion e7'), ('f7_b_pawn', 'czarny pion f7'),
    ('g7_b_pawn', 'czarny pion g7'), ('h7_b_pawn', 'czarny pion h7'),
 )
chessman = models.CharField(max_length=30, choices=chessman, default='pionek', verbose_name="Figura Szachowa")
mymove = []
for a, b in itertools.product('abcdefgh', '12345678'):
    name = a + b
    mymove.append((name, name))
mytuple = tuple(mymove)
move = models.CharField(max_length=2, choices=mytuple, default='a1', verbose_name="Ruch na")

class Meta:
    abstract = True


class State(OneMove):
state_id = models.PositiveIntegerField(default=0, verbose_name="numer ruchu")
is_capture = models.BooleanField(default=False, verbose_name="Czy zbita")
capture_choice = (
    ('true', 'zbity'),
    ('false', 'nie zbity'),
)
is_capture = models.CharField(max_length=9, choices=capture_choice, default='false', verbose_name="Czy zbity")

使用
保存（）
：

如果要使用
save（）
方法，可以执行以下操作：

def save(self, *args, **kwargs):
    OtherModel.objects.create(something=kwargs['something'])
    YetAnotherModel.objects.create(
        something_else=kwargs['something_else']
    )
    super(ChessParty, self).save(*args, **kwargs)

正如@e4c5在他的评论中所说的，它更容易实现，这就是为什么我将其包括在内


我对这个问题的看法：

虽然您可以在
save（）
上执行此操作，但我建议您使用一个

具体使用一个信号。以下是如何做到这一点：

创建一个文件
你的应用程序/signals.py
：

from django.db.models.signals import post_save
from django.dispatch import receiver

from your_app.models import ChessParty, OtherModel, YetAnotherModel


@receiver(post_save, sender=ChessParty)
def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        import your_project.your_app.signals

default_app_config = 'your_project.your_app.apps.YourAppConfig'

from your_app.models import ChessParty, OtherModel, YetAnotherModel


def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig
from django.db.models.signals import post_save

from your_app.models import ChessParty
from your_project.your_app.signals import change_my_name_plz

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        post_save.connect(change_my_name_plz, sender=ChessParty)


您现在需要覆盖您的应用程序/app.py上的
ready（）
函数：

from django.db.models.signals import post_save
from django.dispatch import receiver

from your_app.models import ChessParty, OtherModel, YetAnotherModel


@receiver(post_save, sender=ChessParty)
def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        import your_project.your_app.signals

default_app_config = 'your_project.your_app.apps.YourAppConfig'

from your_app.models import ChessParty, OtherModel, YetAnotherModel


def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig
from django.db.models.signals import post_save

from your_app.models import ChessParty
from your_project.your_app.signals import change_my_name_plz

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        post_save.connect(change_my_name_plz, sender=ChessParty)


最后，在您的应用程序中添加以下内容：

from django.db.models.signals import post_save
from django.dispatch import receiver

from your_app.models import ChessParty, OtherModel, YetAnotherModel


@receiver(post_save, sender=ChessParty)
def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        import your_project.your_app.signals

default_app_config = 'your_project.your_app.apps.YourAppConfig'

from your_app.models import ChessParty, OtherModel, YetAnotherModel


def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig
from django.db.models.signals import post_save

from your_app.models import ChessParty
from your_project.your_app.signals import change_my_name_plz

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        post_save.connect(change_my_name_plz, sender=ChessParty)


现在，在创建新的
棋队
对象之后，有一个信号将创建一个
OtherModel
和
YetAnotherModel
对象


定义信号的替代方法：

还有一种替代方法不使用
@receiver
装饰器，而是使用以下方法：

你的应用程序/signals.py
：

from django.db.models.signals import post_save
from django.dispatch import receiver

from your_app.models import ChessParty, OtherModel, YetAnotherModel


@receiver(post_save, sender=ChessParty)
def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        import your_project.your_app.signals

default_app_config = 'your_project.your_app.apps.YourAppConfig'

from your_app.models import ChessParty, OtherModel, YetAnotherModel


def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig
from django.db.models.signals import post_save

from your_app.models import ChessParty
from your_project.your_app.signals import change_my_name_plz

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        post_save.connect(change_my_name_plz, sender=ChessParty)


你的应用程序/app.py
：

from django.db.models.signals import post_save
from django.dispatch import receiver

from your_app.models import ChessParty, OtherModel, YetAnotherModel


@receiver(post_save, sender=ChessParty)
def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        import your_project.your_app.signals

default_app_config = 'your_project.your_app.apps.YourAppConfig'

from your_app.models import ChessParty, OtherModel, YetAnotherModel


def change_my_name_plz (sender, instance, created, **kwargs):
    if created:
        OtherModel.objects.create(something=kwargs['something'])
        YetAnotherModel.objects.create(
            something_else=kwargs['something_else']
        )

from django.apps import AppConfig
from django.db.models.signals import post_save

from your_app.models import ChessParty
from your_project.your_app.signals import change_my_name_plz

class YourAppConfig(AppConfig):
    name = 'your_project.your_app'

    def ready(self):
        post_save.connect(change_my_name_plz, sender=ChessParty)


您的应用程序/\uuuuu init\uuuuuuupy
与上述步骤相同（步骤3）

使用信号在这里没有任何特殊优势<代码>保存

同样可以很好地（或很差地）完成这项工作，但保存的优点是操作更简单implement@e4c5这是真的，我编辑了我的答案以包含

save（）

方法，尽管OP最简单的解决方案是修改

save（）

在任何地方都提到信号总是很好的，因为有时我们不控制应该触发另一个模型创建的模型：）+1我不明白django与国际象棋有什么关系？或者你是在为国际象棋网站设计一个人机界面？@e4c5这应该是管理国际象棋比赛的平台，裁判做出动作，维沃斯观看。这是一个使用数据库的大学项目。